├── PSAmsi ├── Obfuscators │ ├── PowerShell │ │ ├── Invoke-Obfuscation │ │ │ ├── Out-ObfuscatedStringCommand.ps1 │ │ │ ├── Out-ObfuscatedTokenCommand.ps1 │ │ │ └── LICENSE │ │ └── PowerShellObfuscator.ps1 │ └── ObfuscatorTemplate.ps1 ├── PSAmsi.psd1 ├── Start-PSAmsiClient.ps1 ├── Invoke-PSAmsiScan.ps1 ├── Start-PSAmsiServer.ps1 ├── AmsiFunctions.ps1 ├── PSAmsiScanner.ps1 ├── PSReflect.ps1 └── Find-AmsiSignatures.ps1 ├── README.md └── LICENSE /PSAmsi/Obfuscators/PowerShell/Invoke-Obfuscation/Out-ObfuscatedStringCommand.ps1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cobbr/PSAmsi/HEAD/PSAmsi/Obfuscators/PowerShell/Invoke-Obfuscation/Out-ObfuscatedStringCommand.ps1 -------------------------------------------------------------------------------- /PSAmsi/Obfuscators/PowerShell/Invoke-Obfuscation/Out-ObfuscatedTokenCommand.ps1: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cobbr/PSAmsi/HEAD/PSAmsi/Obfuscators/PowerShell/Invoke-Obfuscation/Out-ObfuscatedTokenCommand.ps1 -------------------------------------------------------------------------------- /PSAmsi/Obfuscators/ObfuscatorTemplate.ps1: -------------------------------------------------------------------------------- 1 | class Obfuscator { 2 | <# 3 | 4 | .SYNOPSIS 5 | 6 | Exists purely as a template class for implementing Obfuscators. 7 | 8 | Author: Ryan Cobb (@cobbr_io) 9 | License: GNU GPLv3 10 | Required Dependecies: none 11 | Optional Dependencies: none 12 | 13 | .DESCRIPTION 14 | 15 | Obfuscator is a template class for obfuscators. Would function as an 16 | interface, but PowerShell v5 does not implement true interfaces. 17 | 18 | .EXAMPLE 19 | 20 | class SomeLanguageObfuscator { 21 | SomeLanguageObfuscator() { } 22 | [String] OutMinimallyObfuscated($ScriptString) { return $ScriptString } 23 | } 24 | 25 | .NOTES 26 | 27 | Obfuscator is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 28 | 29 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 30 | 31 | #> 32 | 33 | Obfuscator() {} 34 | 35 | [String] OutMinimallyObfuscated([String] $ScriptString) { return $ScriptString } 36 | } -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # PSAmsi 2 | 3 | PSAmsi is a tool for auditing and defeating AMSI signatures. 4 | 5 | It's best utilized in a test environment to quickly create payloads you know will not be detected by a particular AntiMalware Provider, although it can be useful in certain situations outside of a test environment. 6 | 7 | When using outside of a test environment, be sure to understand how PSAmsi works, as it can generate AMSI alerts. 8 | 9 | # Getting Started 10 | 11 | [Installation instructions](https://github.com/cobbr/PSAmsi/wiki/Installation-and-Setup) and an [introduction to using PSAmsi](https://github.com/cobbr/PSAmsi/wiki/Introduction-To-PSAmsi) are available in the Wiki. 12 | 13 | # Disclaimer 14 | 15 | You are only authorized to use PSAmsi (and payloads created with PSAmsi) on systems that you have permission to use it on. It was created for research purposes only. 16 | 17 | # Acknowledgements 18 | 19 | A huge thanks to the following people whose code is used by PSAmsi: 20 | * Daniel Bohannon ([@danielhbohannon](https://twitter.com/danielhbohannon)) - PSAmsi currently uses [Invoke-Obfuscation](https://github.com/danielbohannon/Invoke-Obfuscation) for *all* of it's obfuscation. Thanks Daniel! 21 | * Matt Graeber ([@mattifestation](https://twitter.com/mattifestation)) - PSAmsi uses [PSReflect](https://github.com/mattifestation/PSReflect) to call the AMSI functions exported from the AMSI dll, while staying in memory. Thanks Matt! 22 | -------------------------------------------------------------------------------- /PSAmsi/PSAmsi.psd1: -------------------------------------------------------------------------------- 1 | # Module manifest for module 'PSAmsi' 2 | 3 | @{ 4 | 5 | # Version number of this module. 6 | ModuleVersion = '1.1' 7 | 8 | # ID used to uniquely identify this module 9 | GUID = 'e53f158d-8aa2-8c53-da89-ab75d32c8c01' 10 | 11 | # Author of this module 12 | Author = 'Ryan Cobb (@cobbr_io)' 13 | 14 | # Description of the functionality provided by this module 15 | Description = 'PSAmsi is a tool for auditing and defeating AMSI signatures.' 16 | 17 | # Minimum version of the Windows PowerShell engine required by this module 18 | PowerShellVersion = '5.0' 19 | 20 | # Script files (.ps1) that are run in the caller's environment prior to importing this module 21 | ScriptsToProcess = @('PSReflect.ps1','AmsiFunctions.ps1','PSAmsiScanner.ps1', 22 | 'Find-AmsiSignatures.ps1' 23 | 'Invoke-PSAmsiScan.ps1','Start-PSAmsiServer.ps1','Start-PSAmsiClient.ps1', 24 | 'Obfuscators\PowerShell\PowerShellObfuscator.ps1', 'Obfuscators\PowerShell\Invoke-Obfuscation\Out-ObfuscatedAst.ps1', 25 | 'Obfuscators\PowerShell\Invoke-Obfuscation\Out-ObfuscatedTokenCommand.ps1', 'Obfuscators\PowerShell\Invoke-Obfuscation\Out-ObfuscatedStringCommand.ps1') 26 | 27 | # Functions to export from this module 28 | FunctionsToExport = @('Start-PSAmsiServer', 'Start-PSAmsiClient', 'Invoke-PSAmsiScan', 29 | 'New-PSAmsiScanner', 'Get-PSAmsiScanResult', 'Reset-PSAmsiScanCache', 'Invoke-PSAmsiScan', 30 | 'Find-AmsiSignatures', 'Find-AmsiAstSignatures', 'Get-AmsiPSTokenSignatures', 31 | 'Test-ContainsAmsiSignatures', 'Test-ContainsAmsiAstSignatures', 'Test-ContainsAmsiPSTokenSignatures', 32 | 'Get-Ast', 'Get-PSTokens' 33 | 'Out-MinimallyObfuscated', 'Get-ContainingTokens', 34 | 'AmsiInitialize', 'AmsiOpenSession', 'AmsiScanString', 'AmsiScanBuffer', 'AmsiCloseSession', 'AmsiUninitialize') 35 | 36 | } -------------------------------------------------------------------------------- /PSAmsi/Start-PSAmsiClient.ps1: -------------------------------------------------------------------------------- 1 | function Start-PSAmsiClient { 2 | <# 3 | 4 | .SYNOPSIS 5 | 6 | Conducts a series of PSAmsiScans retrieved from a PSAmsiServer. 7 | 8 | Author: Ryan Cobb (@cobbr_io) 9 | License: GNU GPLv3 10 | Required Dependecies: New-PSAmsiScanner, Invoke-PSAmsiScan 11 | Optional Dependencies: none 12 | 13 | .DESCRIPTION 14 | 15 | Start-PSAmsiClient retrieves PSAmsiScan requests from a PSAmsiServer and 16 | checks them against the client's AMSI AntiMalware Provider using Invoke-PSAmsiScan. 17 | 18 | .PARAMETER ServerUri 19 | 20 | Specifies the URI of the PSAmsiServer to retreive requests from. 21 | 22 | .PARAMETER AlertLimit 23 | 24 | Specifies the maximum amount of AMSI alerts this client is allowed to generate. 25 | 26 | .PARAMETER Delay 27 | 28 | Specifies the amount of time (in seconds) to wait between AMSI alerts. 29 | 30 | .PARAMETER PSAmsiScanner 31 | 32 | Specifies the PSAmsiScanner to use for AMSI scans. 33 | 34 | .PARAMETER FindAmsiSignatures 35 | 36 | Specifies that the PSAmsiScan should find and return the AMSI signatures found in the script 37 | in addition to the result of the scan. 38 | 39 | .PARAMETER GetMinimallyObfuscated 40 | 41 | Specifies that the PSAmsiScan should minimally obfuscate the script until it is no longer flagged by AMSI. 42 | 43 | .EXAMPLE 44 | 45 | Start-PSAmsiClient -ServerUri http://10.100.100.10 46 | 47 | .EXAMPLE 48 | 49 | Start-PSAmsiClient -ServerUri http://example.com -AlertLimit 10 -Delay 3600 -FindAmsiSignatures 50 | 51 | .EXAMPLE 52 | 53 | Start-PSAmsiClient -ServerUri http://example.com -Delay 60 -GetMinimallyObfuscated 54 | 55 | .NOTES 56 | 57 | Start-PSAmsiClient is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 58 | 59 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 60 | 61 | #> 62 | 63 | Param( 64 | [Parameter(Position = 0, Mandatory)] 65 | [ValidateScript({$_.Scheme -match 'http|https'})] 66 | [Uri] $ServerUri, 67 | 68 | [Parameter(Position = 1)] 69 | [ValidateRange(0, [Int]::MaxValue)] 70 | [Int] $AlertLimit = 0, 71 | 72 | [Parameter(Position = 2)] 73 | [ValidateRange(0, [Int]::MaxValue)] 74 | [Int] $Delay = 0, 75 | 76 | [Parameter(Position = 3)] 77 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 78 | [System.Object] $PSAmsiScanner, 79 | 80 | [Switch] $FindAmsiSignatures, 81 | 82 | [Switch] $GetMinimallyObfuscated 83 | ) 84 | 85 | $CreatedPSAmsiScanner = $False 86 | # Create the PSAmsiScanner to be used by the PSAmsiClient, if not provided one. 87 | If (-not $PSAmsiScanner) { 88 | $CreatedPSAmsiScanner = $True 89 | $PSAmsiScanner = New-PSAmsiScanner -AlertLimit $AlertLimit -Delay $Delay 90 | } Else { 91 | $PSAmsiScanner.AlertLimit = $AlertLimit 92 | $PSAmsiScanner.Delay = $Delay 93 | } 94 | 95 | # Use the system web proxy, if one exists 96 | (New-Object System.Net.WebClient).Proxy.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials 97 | 98 | # Retrieve the PSAmsiScanRequests from the PSAmsiScanServer 99 | $PSAmsiScanRequestObj = Invoke-RestMethod -Uri $ServerUri -TimeoutSec 0 100 | 101 | # Read CachedAmsiScanResults, PSAmsiServer will provide cached results from other PSAmsiScanClients, if any. 102 | $CachedAmsiScanResults = @{} 103 | $Result = $PSAmsiScanRequestObj.CachedAmsiScanResults | Get-Member -MemberType Properties | % { 104 | $CachedAmsiScanResults.Add($_.Name, $PSAmsiScanRequestObj.CachedAmsiScanResults.($_.Name)) 105 | } 106 | Write-Verbose "[Start-PSAmsiClient] Received $($CachedAmsiScanResults.Count) cached scan results from PSAmsiServer" 107 | Write-Verbose "[Start-PSAmsiClient] Received $($PSAmsiScanRequestObj.PSAmsiScanRequests.Count) PSAmsiScanRequests from PSAmsiServer" 108 | # Have the PSAmsiScanner use any cached scan results provided from the server 109 | $PSAmsiScanner.ScanCache = $CachedAmsiScanResults 110 | 111 | # Iterate through PSAmsiScanRequests, calling Invoke-PSAmsiScan for each one 112 | $PSAmsiScanRequests = $PSAmsiScanRequestObj.PSAmsiScanRequests 113 | If ($FindAmsiSignatures -and $GetMinimallyObfuscated) { 114 | $PSAmsiScanResults = $PSAmsiScanRequests | % { Invoke-PSAmsiScan -ScriptName $_.ScriptName -ScriptString $_.ScriptString -PSAmsiScanner $PSAmsiScanner -FindAmsiSignatures -GetMinimallyObfuscated -IncludeStatus } 115 | } ElseIf ($FindAmsiSignatures) { 116 | $PSAmsiScanResults = $PSAmsiScanRequests | % { Invoke-PSAmsiScan -ScriptName $_.ScriptName -ScriptString $_.ScriptString -PSAmsiScanner $PSAmsiScanner -FindAmsiSignatures -IncludeStatus } 117 | } ElseIf ($GetMinimallyObfuscated) { 118 | $PSAmsiScanResults = $PSAmsiScanRequests | % { Invoke-PSAmsiScan -ScriptName $_.ScriptName -ScriptString $_.ScriptString -PSAmsiScanner $PSAmsiScanner -GetMinimallyObfuscated -IncludeStatus } 119 | } Else { 120 | $PSAmsiScanResults = $PSAmsiScanRequests | % { Invoke-PSAmsiScan -ScriptName $_.ScriptName -ScriptString $_.ScriptString -PSAmsiScanner $PSAmsiScanner -IncludeStatus } 121 | } 122 | 123 | # If any PSAmsiScanRequests are not complete due to AlertLimit, then provide CachedAmsiScanResults to PSAmsiScanServer 124 | # Otherwise, we will just give an empty object to reduce network traffic 125 | $UnfinishedPSAmsiScanRequests = @() 126 | $UnfinishedPSAmsiScanRequests += $PSAmsiScanResults | ? { -not $_.RequestCompleted } 127 | 128 | If ($UnfinishedPSAmsiScanRequests.Count -gt 0) { 129 | Write-Verbose "[Start-PSAmsiClient] $($UnfinishedPSAmsiScanRequests.Count) PSAmsiScanRequest(s) were not completed. Sending $($PSAmsiScanner.ScanCache.Count) cached scan results back to PSAmsiServer." 130 | $PSAmsiScanResultObj = [PSCustomObject] @{ PSAmsiScanResults = $PSAmsiScanResults; CachedAmsiScanResults = $PSAmsiScanner.ScanCache } 131 | } 132 | Else { 133 | $PSAmsiScanResultObj = [PSCustomObject] @{ PSAmsiScanResults = $PSAmsiScanResults; CachedAmsiScanResults = @{} } 134 | } 135 | 136 | # We can now dispose the PSAmsiScanner object, if we created it 137 | If ($CreatedPSAmsiScanner) { 138 | $PSAmsiScanner.Dispose() 139 | } 140 | 141 | # Convert the results to JSON and POST them back to the PSAmsiServer 142 | $JsonString = $PSAmsiScanResultObj | ConvertTo-Json -Depth 4 -Compress 143 | $Response = Invoke-RestMethod -Method Post -Uri $ServerUri -Body $JsonString -TimeoutSec 0 144 | } -------------------------------------------------------------------------------- /PSAmsi/Invoke-PSAmsiScan.ps1: -------------------------------------------------------------------------------- 1 | function Invoke-PSAmsiScan { 2 | <# 3 | 4 | .SYNOPSIS 5 | 6 | Conducts a PSAmsiScan on a given script. 7 | 8 | Author: Ryan Cobb (@cobbr_io) 9 | License: GNU GPLv3 10 | Required Dependecies: New-PSAmsiScanner, Find-AmsiSignatures, Out-MinimallyObfuscated 11 | Optional Dependencies: none 12 | 13 | .DESCRIPTION 14 | 15 | Invoke-PSAmsiScan conducts a PSAmsiScan on a given script, and optionally provides the AMSI signatures 16 | within the script and/or a minimally obfuscated copy of the script that is no longer flagged by AMSI. 17 | 18 | .PARAMETER ScriptString 19 | 20 | The string containing the script to be scanned. 21 | 22 | .PARAMETER ScriptBlock 23 | 24 | The ScriptBlock containing the script to be scanned. 25 | 26 | .PARAMETER ScriptPath 27 | 28 | The Path to the script to be scanned. 29 | 30 | .PARAMETER ScriptUri 31 | 32 | The URI of the script to be scanned. 33 | 34 | .PARAMETER ScriptName 35 | 36 | The name of the script to be scanned. 37 | 38 | .PARAMETER AlertLimit 39 | 40 | Specifies the maximum amount of AMSI alerts this scan is allowed to generate. 41 | 42 | .PARAMETER Delay 43 | 44 | Specifies the amount of time (in seconds) to wait between AMSI alerts. 45 | 46 | .PARAMETER PSAmsiScanner 47 | 48 | Specifies the PSAmsiScanner to use for AMSI scans. 49 | 50 | .PARAMETER FindAmsiSignatures 51 | 52 | Specifies that the PSAmsiScan should find and return the AMSI signatures found in the script 53 | in addition to the result of the scan. 54 | 55 | .PARAMETER GetMinimallyObfuscated 56 | 57 | Specifies that the PSAmsiScan should minimally obfuscate the script until it is 58 | no longer flagged by AMSI. 59 | 60 | .OUTPUTS 61 | 62 | PSCustomObject 63 | 64 | .EXAMPLE 65 | 66 | Invoke-PSAmsiScan -ScriptString "Write-Host test" 67 | 68 | .EXAMPLE 69 | 70 | Invoke-PSAmsiScan -ScriptString "Write-Host test" -FindAmsiSignatures -AlertLimit 15 -Delay 3 71 | 72 | .EXAMPLE 73 | 74 | Invoke-PSAmsiScan -ScriptString "Write-Host test" -GetMinimallyObfuscated 75 | 76 | .NOTES 77 | 78 | Invoke-PSAmsiScan is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 79 | 80 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 81 | 82 | #> 83 | [CmdletBinding(DefaultParameterSetName = "ByString")] Param( 84 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 85 | [ValidateNotNullOrEmpty()] 86 | [String] $ScriptString, 87 | 88 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 89 | [ValidateNotNullOrEmpty()] 90 | [ScriptBlock] $ScriptBlock, 91 | 92 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 93 | [ValidateScript({Test-Path $_ -PathType leaf})] 94 | [Alias('PSPath')] 95 | [String] $ScriptPath, 96 | 97 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 98 | [ValidateScript({$_.Scheme -match 'http|https'})] 99 | [Uri] $ScriptUri, 100 | 101 | [Parameter(Position = 1, ValueFromPipelineByPropertyName)] 102 | [ValidateNotNullOrEmpty()] 103 | [String] $ScriptName, 104 | 105 | [Parameter(Position = 2)] 106 | [ValidateRange(0,[Int]::MaxValue)] 107 | [Int] $AlertLimit = 0, 108 | 109 | [Parameter(Position = 3)] 110 | [ValidateRange(0,[Int]::MaxValue)] 111 | [Int] $Delay = 0, 112 | 113 | [Parameter(Position = 4)] 114 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 115 | [System.Object] $PSAmsiScanner, 116 | 117 | [Switch] $FindAmsiSignatures, 118 | 119 | [Switch] $GetMinimallyObfuscated, 120 | 121 | [Switch] $IncludeStatus 122 | ) 123 | Begin { 124 | $CreatedPSAmsiScanner = $False 125 | If (-not $PSAmsiScanner) { 126 | # Create a PSAmsiScanner 127 | $PSAmsiScanner = New-PSAmsiScanner -AlertLimit $AlertLimit -Delay $Delay 128 | $CreatedPSAmsiScanner = $True 129 | } 130 | Else { 131 | If ($AlertLimit -gt 0) { 132 | $PSAmsiScanner.AlertLimit = $AlertLimit 133 | $PSAmsiScanner.AlertLimitEnabled = $True 134 | } 135 | $PSAmsiScanner.Delay = $Delay 136 | } 137 | } 138 | 139 | Process { 140 | If ($ScriptBlock) { $ScriptString = $ScriptBlock -as [String] } 141 | ElseIf ($ScriptPath) { $ScriptString = Get-Content -Path $ScriptPath -Raw } 142 | ElseIf ($ScriptUri) { $ScriptString = [Net.Webclient]::new().DownloadString($ScriptUri) } 143 | 144 | # Scan the given ScriptString 145 | $ScriptIsFlagged = Test-ContainsAmsiSignatures -ScriptString $ScriptString -PSAmsiScanner $PSAmsiScanner 146 | $PSAmsiScanResult = [PSCustomObject] @{ ScriptIsFlagged = $ScriptIsFlagged } 147 | If ($FindAmsiSignatures) { 148 | $AmsiSignatures = @() 149 | If ($ScriptIsFlagged) { 150 | Write-Verbose "[Invoke-PSAmsiScan] Finding Amsi Signatures in the Script." 151 | $AmsiSignatures = Find-AmsiSignatures -ScriptString $ScriptString -PSAmsiScanner $PSAmsiScanner 152 | # Use Find-AmsiSignatures to retreive the exact strings flagged by AMSI 153 | Write-Verbose "[Invoke-PSAmsiScan] Found $($AmsiSignatures.Count) Amsi Signatures in the Script." 154 | } 155 | $PSAmsiScanResult | Add-Member -Name 'AmsiSignatures' -Value $AmsiSignatures -MemberType NoteProperty 156 | } 157 | If ($GetMinimallyObfuscated) { 158 | Write-Verbose "[Invoke-PSAmsiScan] Getting MinimallyObfuscated copy of Script" 159 | # Use Get-MinimallyObfuscated to retrieve a minimally obfuscated copy of the ScriptString 160 | # that is not flagged by AMSI 161 | $MinimallyObfuscated = $ScriptString 162 | If ($ScanResult -and (-not $PSAmsiScanner.AlertLimitReached)) { 163 | If ($AmsiSignatures) { 164 | $MinimallyObfuscated = Get-MinimallyObfuscated -ScriptString $ScriptString -AmsiSignatures $AmsiSignatures -PSAmsiScanner $PSAmsiScanner 165 | } Else { 166 | $MinimallyObfuscated = Get-MinimallyObfuscated -ScriptString $ScriptString -PSAmsiScanner $PSAmsiScanner 167 | } 168 | } 169 | $PSAmsiScanResult | Add-Member -Name 'MinimallyObfuscated' -Value $MinimallyObfuscated -MemberType NoteProperty 170 | } 171 | 172 | If ($IncludeStatus -or $PSAmsiScanner.AlertLimitEnabled) { 173 | If ($PSAmsiScanner.AlertLimitReached) { 174 | Write-Verbose "[Invoke-PSAmsiScan] AlertLimit reached during execution. Reporting scan as not completed." 175 | } 176 | $PSAmsiScanResult | Add-Member -Name 'RequestCompleted' -Value (-not $PSAmsiScanner.AlertLimitReached) -MemberType NoteProperty 177 | } 178 | If ($ScriptName) { 179 | $PSAmsiScanResult | Add-Member -Name 'ScriptName' -Value $ScriptName -MemberType NoteProperty 180 | } 181 | $PSAmsiScanResult 182 | } 183 | 184 | End { 185 | # Dispose the PSAmsiScanner when done, if it was created within this function 186 | If ($CreatedPSAmsiScanner) { 187 | $PSAmsiScanner.Dispose() 188 | } 189 | } 190 | } -------------------------------------------------------------------------------- /PSAmsi/Start-PSAmsiServer.ps1: -------------------------------------------------------------------------------- 1 | function Start-PSAmsiServer { 2 | <# 3 | 4 | .SYNOPSIS 5 | 6 | Starts a PSAmsiServer that sends PSAmsiScanRequests to connecting PSAmsiClients. 7 | 8 | Author: Ryan Cobb (@cobbr_io) 9 | License: GNU GPLv3 10 | Required Dependecies: none 11 | Optional Dependencies: none 12 | 13 | .DESCRIPTION 14 | 15 | Start-PSAmsiServer starts a PSAmsiServer HTTP Listener and sends PSAmsiScanRequests 16 | to connecting PSAmsiClients and receives the results of the scans. 17 | 18 | .PARAMETER Port 19 | 20 | Specifies the port to start the PSAmsiServer HTTP Listener on. 21 | 22 | .PARAMETER ScriptString 23 | 24 | Specifies the string containing the script to be sent as PSAmsiScanRequests 25 | to PSAmsiClients. 26 | 27 | .PARAMETER ScriptBlock 28 | 29 | Specifies the ScriptBlock containing the script to be sent as PSAmsiScanRequests 30 | to PSAmsiClients. 31 | 32 | .PARAMETER ScriptPath 33 | 34 | Specifies the Path to the script to be sent as PSAmsiScanRequests to PSAMsiClients. 35 | 36 | .PARAMETER ScriptUri 37 | 38 | Specifies the URI of the script to be sent as PSAmsiScanRequests to PSAMsiClients. 39 | 40 | .OUTPUTS 41 | 42 | PSCustomObject 43 | 44 | .EXAMPLE 45 | 46 | Start-PSAmsiServer -Port 443 -ScriptPath Invoke-Example.ps1 47 | 48 | .EXAMPLE 49 | 50 | Get-ChildItem /path/to/scripts -Recurse -Include *.ps1 | Start-PSAmsiServer -Port 80 51 | 52 | .NOTES 53 | 54 | Start-PSAmsiServer is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 55 | 56 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 57 | 58 | #> 59 | [CmdletBinding(DefaultParameterSetName = "ByPath")] Param( 60 | [Parameter(Position = 0, Mandatory)] 61 | [ValidateRange(1, 65535)] 62 | [Int] $Port, 63 | 64 | [Parameter(ParameterSetName = "ByString", Position = 1, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 65 | [ValidateNotNull()] 66 | [String] $ScriptString, 67 | 68 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 1, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 69 | [ValidateNotNullOrEmpty()] 70 | [ScriptBlock] $ScriptBlock, 71 | 72 | [Parameter(ParameterSetName = "ByPath", Position = 1, ValueFromPipelineByPropertyName, Mandatory)] 73 | [ValidateScript({Test-Path $_ -PathType leaf})] 74 | [Alias('PSPath')] 75 | [String] $ScriptPath, 76 | 77 | [Parameter(ParameterSetName = "ByUri", Position = 1, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 78 | [ValidateScript({$_.Scheme -match 'http|https'})] 79 | [Uri] $ScriptUri 80 | ) 81 | Begin{ 82 | $ErrorActionPreference = "Stop" 83 | $HTTPServer = New-Object System.Net.HTTPListener 84 | Write-Verbose "[Start-PSAmsiServer] HTTP Listener starting on port $($Port)" 85 | $HTTPServer.Prefixes.Add("http://+:" + $Port + "/") 86 | $HTTPServer.Start() 87 | 88 | $PSAmsiScanRequests = @() 89 | $ScriptForName = @{} 90 | } 91 | 92 | Process{ 93 | If ($ScriptBlock) { 94 | $ScriptString = $ScriptBlock -as [String] 95 | $ScriptName = $ScriptBlock.Id 96 | } 97 | ElseIf ($ScriptPath) { 98 | $ScriptString = Get-Content -Path $ScriptPath -Raw; 99 | $ScriptName = Split-Path -Path $ScriptPath -Leaf -Resolve 100 | } 101 | ElseIf ($ScriptUri) { 102 | $ScriptString = [Net.Webclient]::new().DownloadString($ScriptUri) 103 | $ScriptName = Split-Path -Path $ScriptUri.OriginalString -Leaf 104 | } 105 | Else { 106 | $ScriptName = "" 107 | $null = [System.Security.Cryptography.HashAlgorithm]::Create('SHA256').ComputeHash([Text.Encoding]::UTF8.GetBytes($ScriptString)) | % { 108 | $ScriptName += $_.ToString("x2") 109 | } 110 | } 111 | 112 | $ScriptForName[$ScriptName] = $ScriptString 113 | $PSAmsiScanRequests += [PSCustomObject] @{ ScriptName = $ScriptName; ScriptString = $ScriptString; } 114 | } 115 | 116 | End { 117 | Write-Verbose "[Start-PSAmsiServer] Prepared $($PSAmsiScanRequests.Count) PSAmsiScanRequest(s)." 118 | $CachedAmsiScanResults = @{} 119 | $PSAmsiScanResults = @() 120 | $PendingGetRequestResponsesQueue = New-Object System.Collections.Queue 121 | 122 | $AwaitingGetRequest = $True 123 | 124 | $Finished = $False 125 | 126 | While (-not $Finished) { 127 | If ($AwaitingGetRequest -and $PendingGetRequestResponsesQueue.Count -gt 0) { 128 | Write-Verbose "[Start-PSAmsiServer] Servicing GET request from queue." 129 | $HTTPServerResponse = $PendingGetRequestResponsesQueue.Dequeue() 130 | 131 | $PSAmsiScanRequestObj = [PSCustomObject] @{ PSAmsiScanRequests = $PSAmsiScanRequests; CachedAmsiScanResults = $CachedAmsiScanResults } 132 | $JsonString = $PSAmsiScanRequestObj | ConvertTo-Json -Depth 4 -Compress 133 | 134 | $ResponseWriter = New-Object System.IO.StreamWriter($HTTPServerResponse.OutputStream) 135 | $ResponseWriter.Write($JsonString) 136 | $ResponseWriter.Close() 137 | $AwaitingGetRequest = $False 138 | } 139 | Write-Verbose "[Start-PSAmsiServer] Waiting for request from a client..." 140 | $HTTPServerContext = $HTTPServer.GetContext() 141 | $HTTPClientRequest = $HTTPServerContext.Request 142 | $HTTPServerResponse = $HTTPServerContext.Response 143 | If ($HTTPClientRequest.HttpMethod -eq 'GET') { 144 | If ((Split-Path -Path ($HTTPClientRequest.Url) -Leaf).ToLower().EndsWith('psamsiclient.ps1')) { 145 | Write-Verbose "[Start-PSAmsiServer] Received GET request from client for PSAmsiClient.ps1" 146 | $ResponseWriter = New-Object System.IO.StreamWriter($HTTPServerResponse.OutputStream) 147 | $PSAmsiClientPath = (Split-Path -Parent $PSCommandPath) + "/../PSAmsiClient.ps1" 148 | If (Test-Path $PSAmsiClientPath) { 149 | Write-Verbose "[Start-PSAmsiServer] Serving PSAmsiClient.ps1 to client" 150 | $ClientCode = Get-Content $PSAmsiClientPath -Raw 151 | $ResponseWriter.Write($ClientCode) 152 | $ResponseWriter.Close() 153 | } 154 | Else { 155 | Write-Error "[Start-PSAmsiServer] PSAmsiClient.ps1 file could not be found. Sending empty response." 156 | $ResponseWriter.Write('') 157 | $ResponseWriter.Close() 158 | } 159 | } 160 | Else { 161 | Write-Verbose "[Start-PSAmsiServer] Received GET request from client. Adding it to the queue." 162 | $PendingGetRequestResponsesQueue.Enqueue($HTTPServerResponse) 163 | } 164 | } 165 | ElseIf ($HTTPClientRequest.HttpMethod -eq 'POST') { 166 | Write-Verbose "[Start-PSAmsiServer] Received POST request from client. Processing data returned." 167 | $RequestReader = New-Object System.IO.StreamReader($HTTPClientRequest.InputStream, $HTTPClientRequest.ContentEncoding) 168 | $PSAmsiScanResultObj = $RequestReader.ReadToEnd() | ConvertFrom-Json 169 | $HTTPServerResponse.ContentLength64 = 0 170 | $HTTPServerResponse.OutputStream.Close() 171 | $PSAmsiScanResults += $PSAmsiScanResultObj.PSAmsiScanResults | ? { $_.RequestCompleted } 172 | $UnfinishedPSAmsiScanResults = $PSAmsiScanResultObj.PSAmsiScanResults | ? { -not $_.RequestCompleted } 173 | If ($UnfinishedPSAmsiScanResults) { 174 | Write-Verbose "[Start-PSAmsiServer] $($UnfinishedPSAmsiScanResults.Count) PSAmsiScanRequest(s) were not completed." 175 | # Not finished with at least one scan request 176 | $CachedAmsiScanResults = @{} 177 | $Result = $PSAmsiScanResultObj.CachedAmsiScanResults | Get-Member -MemberType Properties | % { 178 | $CachedAmsiScanResults.Add($_.Name, $PSAmsiScanResultObj.CachedAmsiScanResults.($_.Name)) 179 | } 180 | $PSAmsiScanRequests = @() 181 | ForEach ($UnfinishedPSAmsiScanResult in $UnfinishedPSAmsiScanResults) { 182 | If ($UnfinishedPSAmsiScanResult.MinimallyObfuscated) { 183 | $ScriptString = $UnfinishedPSAmsiScanResult.MinimallyObfuscated 184 | } 185 | Else { 186 | $ScriptString = $ScriptForName[$UnfinishedPSAmsiScanResult.ScriptName] 187 | } 188 | $PSAmsiScanRequests += [PSCustomObject] @{ ScriptName = $UnfinishedPSAmsiScanResult.ScriptName; ScriptString = $ScriptString; } 189 | } 190 | $AwaitingGetRequest = $True 191 | } 192 | Else { 193 | $Finished = $True 194 | } 195 | } 196 | Else { 197 | Write-Error "[Start-PSAmsiServer] Client $($Client.RemoteEndpoint) attempted unknown HttpMethod $($HTTPClientRequest.HttpMethod)" 198 | } 199 | } 200 | Write-Verbose "[Start-PSAmsiServer] All scans completed. Stopping Server." 201 | $HTTPServer.Stop() 202 | $Properties = @('ScriptName', 'ScriptIsFlagged', 'RequestCompleted') 203 | If ($PSAmsiScanResults | ? { $_.AmsiSignatures }) { $Properties += 'AmsiSignatures' } 204 | If ($PSAmsiScanResults | ? { $_.MinimallyObfuscated }) { $Properties += 'MinimallyObfuscated' } 205 | $PSAmsiScanResults | Select-Object -Property $Properties -ExcludeProperty RequestCompleted | Sort-Object ScriptIsFlagged -Descending 206 | } 207 | } -------------------------------------------------------------------------------- /PSAmsi/Obfuscators/PowerShell/Invoke-Obfuscation/LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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(Uses PSReflect written by Matt Graeber (@mattifestation)) 4 | $Module = New-InMemoryModule -ModuleName AMSI 5 | 6 | $FunctionDefinitions = @( 7 | (func amsi AmsiInitialize ([UInt32]) @( 8 | [String], # _In_ LPCWSTR appName, 9 | [Int64].MakeByRefType() # _Out_ HAMSICONTEXT *amsiContext 10 | ) -EntryPoint AmsiInitialize -SetLastError), 11 | 12 | (func amsi AmsiUninitialize ([Void]) @( 13 | [IntPtr] # _In_ HAMSICONTEXT amsiContext 14 | ) -EntryPoint AmsiUninitialize -SetLastError), 15 | 16 | (func amsi AmsiOpenSession ([UInt32]) @( 17 | [IntPtr], # _In_ HAMSICONTEXT amsiContext 18 | [Int].MakeByRefType() # _Out_ HAMSISESSION *session 19 | ) -EntryPoint AmsiOpenSession -SetLastError), 20 | 21 | (func amsi AmsiCloseSession ([Void]) @( 22 | [IntPtr], # _In_ HAMSICONTEXT amsiContext 23 | [IntPtr] # _In_ HAMSISESSION session 24 | ) -EntryPoint AmsiCloseSession -SetLastError), 25 | 26 | (func amsi AmsiScanBuffer ([UInt32]) @( 27 | [IntPtr], # _In_ HAMSICONTEXT amsiContext 28 | [IntPtr], # _In_ PVOID buffer 29 | [UInt32], # _In_ ULONG length 30 | [String], # _In_ LPCWSTR contentName 31 | [IntPtr], # _In_opt_ HAMSISESSION session 32 | [Int].MakeByRefType() # _Out_ AMSI_RESULT *result 33 | ) -EntryPoint AmsiScanBuffer -SetLastError), 34 | 35 | (func amsi AmsiScanString ([UInt32]) @( 36 | [IntPtr], # _In_ HAMSICONTEXT amsiContext 37 | [String], # _In_ LPCWSTR string 38 | [String], # _In_ LPCWSTR contentName 39 | [IntPtr], # _In_opt_ HAMSISESSION session 40 | [Int].MakeByRefType() # _Out_ AMSI_RESULT *result 41 | ) -EntryPoint AmsiScanString -SetLastError) 42 | ) 43 | 44 | $AMSI_RESULT = psenum $Module AMSI.AMSI_RESULT UInt32 @{ 45 | AMSI_RESULT_CLEAN = 0 46 | AMSI_RESULT_NOT_DETECTED = 1 47 | AMSI_RESULT_BLOCKED_BY_ADMIN_START = 16384 48 | AMSI_RESULT_BLOCKED_BY_ADMIN_END = 20479 49 | AMSI_RESULT_DETECTED = 32768 50 | } 51 | 52 | $Types = $FunctionDefinitions | Add-Win32Type -Module $Module -Namespace 'AMSI.NativeMethods' 53 | $amsi = $Types['amsi'] 54 | } 55 | 56 | function AmsiInitialize { 57 | <# 58 | 59 | .SYNOPSIS 60 | 61 | Initializes an AmsiContext to conduct AMSI scans. 62 | 63 | Author: Ryan Cobb (@cobbr_io) 64 | License: GNU GPLv3 65 | Required Dependecies: PSReflect, amsi 66 | Optional Dependencies: none 67 | 68 | .DESCRIPTION 69 | 70 | AmsiInitialize initializes an AmsiContext to conduct AMSI scans by calling the function 71 | described here: https://msdn.microsoft.com/en-us/library/windows/desktop/dn889862(v=vs.85).aspx 72 | 73 | .PARAMETER appName 74 | 75 | The name of the App that will be submitting AMSI scan requests. 76 | 77 | .PARAMETER amsiContext 78 | 79 | A reference to the amsiContext that will be set by this function. 80 | 81 | .OUTPUTS 82 | 83 | Int 84 | 85 | .EXAMPLE 86 | 87 | $AmsiContext = [IntPtr]::Zero 88 | AmsiInitialize -appName "PSAmsi" -amsiContext ([ref]$AmsiContext) 89 | 90 | .NOTES 91 | 92 | AmsiInitialize is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 93 | 94 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 95 | 96 | #> 97 | Param ( 98 | [Parameter(Position = 0, Mandatory)] 99 | [ValidateNotNullOrEmpty()] 100 | [String] $appName, 101 | 102 | [Parameter(Position = 1, Mandatory)] 103 | [ref] $amsiContext 104 | ) 105 | 106 | $HResult = $amsi::AmsiInitialize($appName, $amsiContext) 107 | 108 | If ($HResult -ne 0) { 109 | throw "AmsiInitialize Error: $($HResult). AMSI may not be enabled on your system." 110 | } 111 | 112 | $HResult 113 | } 114 | 115 | function AmsiOpenSession { 116 | <# 117 | 118 | .SYNOPSIS 119 | 120 | Opens an AmsiSession associated with an AmsiContext to conduct AMSI scans. 121 | 122 | Author: Ryan Cobb (@cobbr_io) 123 | License: GNU GPLv3 124 | Required Dependecies: PSReflect, amsi 125 | Optional Dependencies: none 126 | 127 | .DESCRIPTION 128 | 129 | AmsiOpenSession opens an AmsiSession assocaited with an AmsiContext by calling the function 130 | described here: https://msdn.microsoft.com/en-us/library/windows/desktop/dn889863(v=vs.85).aspx 131 | 132 | .PARAMETER amsiContext 133 | 134 | A pointer to the AmsiContext for which this AmsiSession will be associated. 135 | 136 | .PARAMETER session 137 | 138 | A reference to the AmsiSession that will be set by this function. 139 | 140 | .OUTPUTS 141 | 142 | Int 143 | 144 | .EXAMPLE 145 | 146 | $AmsiSession = [IntPtr]::Zero 147 | AmsiInitialize -amsiContext $AmsiContext -session ([ref]$AmsiSession) 148 | 149 | .NOTES 150 | 151 | AmsiOpenSession is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 152 | 153 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 154 | 155 | #> 156 | Param ( 157 | [Parameter(Position = 0, Mandatory)] 158 | [ValidateNotNullOrEmpty()] 159 | [IntPtr] $amsiContext, 160 | 161 | [Parameter(Position = 1, Mandatory)] 162 | [ref] $session 163 | ) 164 | 165 | $HResult = $amsi::AmsiOpenSession($amsiContext, $session) 166 | 167 | If ($HResult -ne 0) { 168 | throw "AmsiOpenSession Error: $($HResult)" 169 | } 170 | 171 | $HResult 172 | } 173 | 174 | function AmsiScanString { 175 | <# 176 | 177 | .SYNOPSIS 178 | 179 | Submits a string to the AMSI to be scanned by the AntiMalware Provider. 180 | 181 | Author: Ryan Cobb (@cobbr_io) 182 | License: GNU GPLv3 183 | Required Dependecies: PSReflect, amsi 184 | Optional Dependencies: none 185 | 186 | .DESCRIPTION 187 | 188 | AmsiScanString submits a string to to the AMSI to be scanned by the AntiMalware provider by calling 189 | the function described here: https://msdn.microsoft.com/en-us/library/windows/desktop/dn889866(v=vs.85).aspx 190 | 191 | .PARAMETER amsiContext 192 | 193 | A pointer to the AmsiContext this scan is associated with. 194 | 195 | .PARAMETER string 196 | 197 | The string to be scanned for malware. 198 | 199 | .PARAMETER contentName 200 | 201 | The name of the content to be scanned. 202 | 203 | .PARAMETER session 204 | 205 | A pointer to the AmsiSession this scan is a part of. 206 | 207 | .PARAMETER result 208 | 209 | A reference to the result of the scan that will be set by this function. 210 | 211 | .OUTPUTS 212 | 213 | Int 214 | 215 | .EXAMPLE 216 | 217 | $AmsiResult = $AMSI_RESULT::AMSI_RESULT_NOT_DETECTED 218 | AmsiScanString $AmsiContext $ScriptString $ContentName $AmsiSession -result ([ref]$AmsiResult) 219 | 220 | .NOTES 221 | 222 | AmsiScanString is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 223 | 224 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 225 | 226 | #> 227 | Param ( 228 | [Parameter(Position = 0, Mandatory)] 229 | [ValidateNotNullOrEmpty()] 230 | [IntPtr] $amsiContext, 231 | 232 | [Parameter(Position = 1, Mandatory)] 233 | [ValidateNotNullOrEmpty()] 234 | [String] $string, 235 | 236 | [Parameter(Position = 2, Mandatory)] 237 | [ValidateNotNullOrEmpty()] 238 | [String] $contentName, 239 | 240 | [Parameter(Position = 3, Mandatory)] 241 | [ValidateNotNullOrEmpty()] 242 | [IntPtr] $session, 243 | 244 | [Parameter(Position = 4, Mandatory)] 245 | [ref] $result 246 | ) 247 | 248 | $HResult = $amsi::AmsiScanString($amsiContext, $string, $contentName, $session, $result) 249 | 250 | If ($HResult -ne 0) { 251 | $ErrorMessage = "AmsiScanString Error: $($HResult)" 252 | If ($HResult -eq 2147942421) { 253 | $ErrorMessage += ". If the AmsiInitialize and AmsiOpenSession functions succeeded and AmsiScanString fails with error code $($HResult), it is likely that your AMSI AntiMalware Provider is being somewhat deceptive when they say they have implemented AMSI support." 254 | } 255 | throw $ErrorMessage 256 | } 257 | 258 | $HResult 259 | } 260 | 261 | function AmsiScanBuffer { 262 | <# 263 | 264 | .SYNOPSIS 265 | 266 | Submits a buffer to the AMSI to be scanned by the AntiMalware Provider. 267 | 268 | Author: Ryan Cobb (@cobbr_io) 269 | License: GNU GPLv3 270 | Required Dependecies: PSReflect, amsi 271 | Optional Dependencies: none 272 | 273 | .DESCRIPTION 274 | 275 | AmsiScanBuffer submits a buffer to the AMSI to be scanned by the AntiMalware provider by calling the 276 | function described here: https://msdn.microsoft.com/en-us/library/windows/desktop/dn889865(v=vs.85).aspx 277 | 278 | .PARAMETER amsiContext 279 | 280 | A pointer to the AmsiContext this scan is associated with. 281 | 282 | .PARAMETER buffer 283 | 284 | A pointer to the buffer to be scanned for malware. 285 | 286 | .PARAMETER length 287 | 288 | The length of the buffer to be scanned for malware. 289 | 290 | .PARAMETER contentName 291 | 292 | The name of the content to be scanned. 293 | 294 | .PARAMETER session 295 | 296 | A pointer to the AmsiSession this scan is a part of. 297 | 298 | .PARAMETER result 299 | 300 | A reference to the result of the scan that will be set by this function. 301 | 302 | .OUTPUTS 303 | 304 | Int 305 | 306 | .EXAMPLE 307 | 308 | $AmsiResult = $AMSI_RESULT::AMSI_RESULT_NOT_DETECTED 309 | AmsiScanBuffer $AmsiContext $Buffer $Length $ContentName $AmsiSession -result ([ref]$AmsiResult) 310 | 311 | .NOTES 312 | 313 | AmsiScanBuffer is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 314 | 315 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 316 | 317 | #> 318 | Param ( 319 | [Parameter(Position = 0, Mandatory)] 320 | [ValidateNotNullOrEmpty()] 321 | [IntPtr] $amsiContext, 322 | 323 | [Parameter(Position = 1, Mandatory)] 324 | [ValidateNotNullOrEmpty()] 325 | [IntPtr] $buffer, 326 | 327 | [Parameter(Position = 2, Mandatory)] 328 | [ValidateNotNullOrEmpty()] 329 | [Int] $length, 330 | 331 | [Parameter(Position = 3, Mandatory)] 332 | [ValidateNotNullOrEmpty()] 333 | [String] $contentName, 334 | 335 | [Parameter(Position = 4, Mandatory)] 336 | [ValidateNotNullOrEmpty()] 337 | [IntPtr] $session, 338 | 339 | [Parameter(Position = 5, Mandatory)] 340 | [ref] $result 341 | ) 342 | 343 | $HResult = $amsi::AmsiScanBuffer($amsiContext, $buffer, $length, $contentName, $session, $result) 344 | 345 | If ($HResult -ne 0) { 346 | $ErrorMessage = "AmsiScanBuffer Error: $($HResult)" 347 | If ($HResult -eq 2147942421) { 348 | $ErrorMessage += ". If the AmsiInitialize and AmsiOpenSession functions succeeded and AmsiScanBuffer fails with error code $($HResult), it is likely that your AMSI AntiMalware Provider is being somewhat deceptive when they say they have implemented AMSI support." 349 | } 350 | throw $ErrorMessage 351 | } 352 | 353 | $HResult 354 | } 355 | 356 | function AmsiResultIsMalware { 357 | <# 358 | 359 | .SYNOPSIS 360 | 361 | Determines if a previous AmsiScan detected malware, based on it's AmsiResult. 362 | 363 | Author: Ryan Cobb (@cobbr_io) 364 | License: GNU GPLv3 365 | Required Dependecies: PSReflect, AMSI_RESULT 366 | Optional Dependencies: none 367 | 368 | .DESCRIPTION 369 | 370 | AmsiResultIsMalware takes the result from an AmsiScanString or AmsiScanBuffer scan and 371 | uses the AMSI_RESULT enum to determine if the scan detected malware. 372 | 373 | .PARAMETER AMSIRESULT 374 | 375 | The result from a AmsiScanString or AmsiScanBuffer call. 376 | 377 | .OUTPUTS 378 | 379 | Bool 380 | 381 | .EXAMPLE 382 | 383 | $AmsiResult = $AMSI_RESULT::AMSI_RESULT_NOT_DETECTED 384 | AmsiScanString $Context $Content $ContentName $Session -result ([ref]$AmsiResult) 385 | AmsiResultIsMalware -AMSIRESULT $AmsiResult 386 | 387 | .NOTES 388 | 389 | AmsiResultIsMalware is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 390 | 391 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 392 | 393 | #> 394 | Param ( 395 | [Parameter(Position = 0, Mandatory)] 396 | [ValidateScript({($_ -in @(0,1)) -OR (($_ -ge 16384) -AND ($_ -le 20479)) -OR ($_ -ge 32768)})] 397 | [UInt32] $AMSIRESULT 398 | ) 399 | 400 | If(($AMSIRESULT -ne $AMSI_RESULT::AMSI_RESULT_CLEAN) -and 401 | ($AMSIRESULT -ne $AMSI_RESULT::AMSI_RESULT_NOT_DETECTED)) { 402 | $True 403 | } 404 | Else { $False } 405 | } 406 | 407 | function AmsiCloseSession { 408 | <# 409 | 410 | .SYNOPSIS 411 | 412 | Closes an AmsiSession opened with AmsiOpenSession. 413 | 414 | Author: Ryan Cobb (@cobbr_io) 415 | License: GNU GPLv3 416 | Required Dependecies: PSReflect, amsi 417 | Optional Dependencies: none 418 | 419 | .DESCRIPTION 420 | 421 | AmsiCloseSession closes an AmsiSession opened with AmsiOpenSession by calling the function 422 | described here: https://msdn.microsoft.com/en-us/library/windows/desktop/dn889861(v=vs.85).aspx 423 | 424 | .PARAMETER amsiContext 425 | 426 | A pointer to the AmsiContext for which this AmsiSession is associated. 427 | 428 | .PARAMETER session 429 | 430 | A pointer to the AmsiSession to be closed. 431 | 432 | .OUTPUTS 433 | 434 | None 435 | 436 | .EXAMPLE 437 | 438 | $AmsiSession = [IntPtr]::Zero 439 | AmsiOpenSession -amsiContext $AmsiContext -session ([ref]$AmsiSession) 440 | AmsiCloseSession -amsiConext $AmsiContext -session $AmsiSession 441 | 442 | .NOTES 443 | 444 | AmsiCloseSession is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 445 | 446 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 447 | 448 | #> 449 | Param ( 450 | [Parameter(Position = 0, Mandatory)] 451 | [ValidateNotNullOrEmpty()] 452 | [IntPtr] $amsiContext, 453 | 454 | [Parameter(Position = 1, Mandatory)] 455 | [ValidateNotNullOrEmpty()] 456 | [IntPtr] $session 457 | ) 458 | 459 | $HResult = $amsi::AmsiCloseSession($amsiContext, $session) 460 | } 461 | 462 | function AmsiUninitialize { 463 | <# 464 | 465 | .SYNOPSIS 466 | 467 | Uninitializes an AmsiContext initialized with AmsiInitialize. 468 | 469 | Author: Ryan Cobb (@cobbr_io) 470 | License: GNU GPLv3 471 | Required Dependecies: PSReflect, amsi 472 | Optional Dependencies: none 473 | 474 | .DESCRIPTION 475 | 476 | AmsiUninitialize uninitializes an AmsiContext initialized with AmsiInitialize by calling the function 477 | described here: https://msdn.microsoft.com/en-us/library/windows/desktop/dn889867(v=vs.85).aspx 478 | 479 | .PARAMETER amsiContext 480 | 481 | A pointer to the AmsiContext to be uninitialized. 482 | 483 | .OUTPUTS 484 | 485 | None 486 | 487 | .EXAMPLE 488 | 489 | $AmsiContext = [IntPtr]::Zero 490 | AmsiInitialize -appName "PSAmsi" -amsiContext ([ref]$AmsiContext) 491 | AmsiUninitialize -amsiConext $AmsiContext 492 | 493 | .NOTES 494 | 495 | AmsiUninitialize is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 496 | 497 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 498 | 499 | #> 500 | Param ( 501 | [Parameter(Position = 0, Mandatory)] 502 | [IntPtr] $amsiContext 503 | ) 504 | 505 | $HResult = $amsi::AmsiUninitialize($amsiContext) 506 | } 507 | -------------------------------------------------------------------------------- /PSAmsi/PSAmsiScanner.ps1: -------------------------------------------------------------------------------- 1 | class PSAmsiScanner : System.IDisposable { 2 | [ValidateNotNull()] 3 | [String] $PSAmsiScannerAppName = "PSAmsi" 4 | 5 | [ValidateNotNull()] 6 | [Bool] $CacheEnabled = $True 7 | [ValidateNotNull()] 8 | [HashTable] $ScanCache = @{} 9 | 10 | [ValidateNotNull()] 11 | [String[]] $ScanBlacklist = @() 12 | [ValidateNotNull()] 13 | [String[]] $ScanWhitelist = @() 14 | [Bool] $OnlyUseBlacklist = $False 15 | 16 | [ValidateNotNull()] 17 | [Bool] $AlertLimitEnabled = $False 18 | [ValidateNotNull()] 19 | [Bool] $AlertLimitReached = $False 20 | [ValidateRange(0,[Int]::MaxValue)] 21 | [Int] $AlertLimit = 0 22 | [ValidateRange(0, [Int]::MaxValue)] 23 | [Int] $AlertCount = 0 24 | [ValidateRange(0, [Int]::MaxValue)] 25 | [Int] $Delay = 0 26 | 27 | hidden [Long] $AmsiContext 28 | hidden [Long] $AmsiSession 29 | 30 | # InitAmsi initializes items shared by all Constructors 31 | hidden InitAmsi() { 32 | $TempContext = [IntPtr]::Zero 33 | $TempSession = [IntPtr]::Zero 34 | $Result = AmsiInitialize -appName $this.PSAmsiScannerAppName -amsiContext ([ref] $TempContext) 35 | $Result = AmsiOpenSession -amsiContext $TempContext -session ([ref] $TempSession) 36 | $this.AmsiContext = $TempContext 37 | $this.AmsiSession = $TempSession 38 | } 39 | 40 | # Default constructor 41 | PSAmsiScanner() { 42 | $this.InitAmsi() 43 | } 44 | 45 | # Constructor - Specify AppName 46 | PSAmsiScanner([String] $PSAmsiScannerAppName) { 47 | $this.PSAmsiScannerAppName = $PSAmsiScannerAppName 48 | $this.InitAmsi() 49 | } 50 | 51 | # Constructor - Specify if Cache is enabled. 52 | PSAmsiScanner([Bool] $CacheEnabled) { 53 | $this.CacheEnabled = $CacheEnabled 54 | $this.InitAmsi() 55 | } 56 | 57 | # Constructor - Specify the ScanCache to use. 58 | PSAmsiScanner([HashTable] $ScanCache) { 59 | $this.ScanCache = $ScanCache 60 | $this.InitAmsi() 61 | } 62 | 63 | # Constructor - Specify an AlertLimit. 64 | PSAmsiScanner([Int] $AlertLimit) { 65 | If ($AlertLimit -gt 0) { 66 | $this.AlertLimitEnabled = $True 67 | $this.AlertLimit = $AlertLimit 68 | } 69 | $this.InitAmsi() 70 | } 71 | 72 | # Constructor - Specify a ScanBlacklist and a ScanWhitelist. 73 | PSAmsiScanner([String[]] $ScanBlacklist, [String[]] $ScanWhitelist) { 74 | $this.ScanBlacklist = $ScanBlacklist 75 | $this.ScanWhitelist = $ScanWhitelist 76 | $this.InitAmsi() 77 | } 78 | 79 | # Constructor - Specify a ScanBlacklist and if the scanner should only use the Blacklist, w/o doing AMSI scanning. 80 | PSAmsiScanner([String[]] $ScanBlacklist, $OnlyUseBlacklist) { 81 | $this.ScanBlacklist = $ScanBlacklist 82 | $this.OnlyUseBlacklist = $OnlyUseBlacklist 83 | $this.InitAmsi() 84 | } 85 | 86 | # Constructor - Specify an AlertLimit and a Delay. 87 | PSAmsiScanner([Int] $AlertLimit, [Int] $Delay) { 88 | $this.Delay = $Delay 89 | If ($AlertLimit -gt 0) { 90 | $this.AlertLimitEnabled = $True 91 | $this.AlertLimit = $AlertLimit 92 | } 93 | $this.InitAmsi() 94 | } 95 | 96 | # Constructor - Specify an AppName, an AlertLimit, and a Delay. 97 | PSAmsiScanner([String] $PSAmsiScannerAppName, [Int] $AlertLimit, [Int] $Delay) { 98 | $this.PSAmsiScannerAppName = $PSAmsiScannerAppName 99 | $this.Delay = $Delay 100 | If ($AlertLimit -gt 0) { 101 | $this.AlertLimitEnabled = $True 102 | $this.AlertLimit = $AlertLimit 103 | } 104 | $this.InitAmsi() 105 | } 106 | 107 | # Constructor - Specify an AppName, if the Cache is enabled, an AlertLimit, and a Delay. 108 | PSAmsiScanner([String] $PSAmsiScannerAppName, [Bool] $CacheEnabled, [Int] $AlertLimit, [Int] $Delay) { 109 | $this.PSAmsiScannerAppName = $PSAmsiScannerAppName 110 | $this.CacheEnabled = $CacheEnabled 111 | If ($AlertLimit -gt 0) { 112 | $this.AlertLimitEnabled = $True 113 | $this.AlertLimit = $AlertLimit 114 | } 115 | $this.Delay = $Delay 116 | $this.InitAmsi() 117 | } 118 | 119 | # Constructor - Specify an AppName, the ScanCache to use, an AlertLimit, and a Delay. 120 | PSAmsiScanner([String] $PSAmsiScannerAppName, [HashTable] $ScanCache, [Int] $AlertLimit, [Int] $Delay) { 121 | $this.PSAmsiScannerAppName = $PSAmsiScannerAppName 122 | $this.ScanCache = $this.ScanCache 123 | $this.CacheEnabled = $True 124 | If ($AlertLimit -gt 0) { 125 | $this.AlertLimitEnabled = $True 126 | $this.AlertLimit = $AlertLimit 127 | } 128 | $this.Delay = $Delay 129 | $this.InitAmsi() 130 | } 131 | 132 | # Constructor - Specify an AppName, the ScanCache to use, an AlertLimit, a Delay, a ScanBlacklist, and a ScanWhitelist. 133 | PSAmsiScanner([String] $PSAmsiScannerAppName, [HashTable] $ScanCache, [Int] $AlertLimit, [Int] $Delay, [String[]] $ScanBlacklist, [String[]] $ScanWhitelist) { 134 | $this.ScanBlacklist = $ScanBlacklist 135 | $this.ScanWhitelist = $ScanWhitelist 136 | $this.PSAmsiScannerAppName = $PSAmsiScannerAppName 137 | $this.ScanCache = $this.ScanCache 138 | $this.CacheEnabled = $True 139 | If ($AlertLimit -gt 0) { 140 | $this.AlertLimitEnabled = $True 141 | $this.AlertLimit = $AlertLimit 142 | } 143 | $this.Delay = $Delay 144 | $this.InitAmsi() 145 | } 146 | 147 | [Void] Dispose() { 148 | $this.Dispose($true) 149 | [System.GC]::SuppressFinalize($this) 150 | } 151 | 152 | [Void] Dispose([Bool] $Disposing) { 153 | If ($Disposing) { 154 | [IntPtr] $TempContext = $this.AmsiContext 155 | [IntPtr] $TempSession = $this.AmsiSession 156 | $Result = AmsiCloseSession -amsiContext $TempContext -session $TempSession 157 | $Result = AmsiUninitialize $TempContext 158 | } 159 | } 160 | 161 | [Bool] GetPSAmsiScanResult([String] $ScriptString, [String] $PSAmsiContentName) { 162 | If (-not $ScriptString) { 163 | return $False 164 | } 165 | 166 | $HashCode = $ScriptString.GetHashCode() -as [String] 167 | If (($ScriptString.ToLower() -in $this.ScanBlacklist) -or ($ScriptString.ToLower().GetHashCode() -in $this.ScanBlacklist)) { return $True } 168 | ElseIf ($this.OnlyUseBlacklist) { return $False } 169 | If (($ScriptString -in $this.ScanWhitelist) -or ($HashCode -in $this.ScanWhitelist)) { return $False } 170 | 171 | If ($this.CacheEnabled -and ($this.ScanCache.Contains($HashCode))) { 172 | return $this.ScanCache.Get_Item($HashCode) 173 | } 174 | 175 | # If we have reached our global alert limit, we will not conduct a scan. Instead, we return false, but this does 176 | # not guarantee the given string will not be flagged. 177 | If ($this.AlertLimitReached) { 178 | return $False 179 | } 180 | Else { 181 | # 1 is AMSI_RESULT_NOT_DETECTED 182 | $AmsiResult = 1 183 | $IsFlaggedAsMalware = $False 184 | [IntPtr] $TempContext = $this.AmsiContext 185 | [IntPtr] $TempSession = $this.AmsiSession 186 | $Result = AmsiScanString -amsiContext $TempContext -string $ScriptString -contentName $this.PSAmsiScannerAppName -session $TempSession -result ([ref]$AmsiResult) 187 | If (AmsiResultIsMalware -AMSIRESULT $AmsiResult) { 188 | $IsFlaggedAsMalware = $True 189 | } 190 | 191 | If ($this.CacheEnabled) { 192 | $this.ScanCache.Set_Item($HashCode, $IsFlaggedAsMalware) 193 | } 194 | 195 | If ($IsFlaggedAsMalware) { 196 | If ($this.Delay -gt 0) { 197 | Write-Verbose "Delaying for $($this.Delay) second(s)..." 198 | Start-Sleep -Seconds $this.Delay 199 | } 200 | $this.AlertCount++ 201 | If ($this.AlertLimitEnabled -and $this.AlertCount -ge $this.AlertLimit) { $this.AlertLimitReached = $True } 202 | } 203 | 204 | return $IsFlaggedAsMalware 205 | } 206 | } 207 | 208 | [Bool] GetPSAmsiScanResult([ScriptBlock] $ScriptBlock, [String] $PSAmsiContentName) { 209 | $ScriptString = $ScriptBlock -as [String] 210 | return $this.GetPSAmsiScanResult($ScriptString, $PSAmsiContentName) 211 | } 212 | 213 | [Bool] GetPSAmsiScanResult([IO.FileInfo] $ScriptPath, [String] $PSAmsiContentName) { 214 | $ScriptString = Get-Content $ScriptPath -Raw 215 | return $this.GetPSAmsiScanResult($ScriptString, $PSAmsiContentName) 216 | } 217 | 218 | [Bool] GetPSAmsiScanResult([Uri] $ScriptUri, [String] $PSAmsiContentName) { 219 | $ScriptString = [Net.Webclient]::new().DownloadString($ScriptUri) 220 | return $this.GetPSAmsiScanResult($ScriptString, $PSAmsiContentName) 221 | } 222 | 223 | [Bool] GetPSAmsiScanResult([String] $ScriptString) { 224 | return $this.GetPSAmsiScanResult($ScriptString, $this.PSAmsiScannerAppName) 225 | } 226 | 227 | [Bool] GetPSAmsiScanResult([ScriptBlock] $ScriptBlock) { 228 | return $this.GetPSAmsiScanResult($ScriptBlock, $this.PSAmsiScannerAppName) 229 | } 230 | 231 | [Bool] GetPSAmsiScanResult([IO.FileInfo] $ScriptPath) { 232 | return $this.GetPSAmsiScanResult($ScriptPath, $this.PSAmsiScannerAppName) 233 | } 234 | 235 | [Bool] GetPSAmsiScanResult([Uri] $ScriptUri) { 236 | return $this.GetPSAmsiScanResult($ScriptUri, $this.PSAmsiScannerAppName) 237 | } 238 | 239 | [Bool] TestEicarDetection() { 240 | $Test = ("Y6P`"Q&ABQ\5]Q[Y65)Q_*8DD*8~%FJDBS.TUBOEBSE.BOUJWJSVT.UFTU.GJMF`"%I,I+".ToCharArray() | % { (($_ -as [Int]) - 1) -as [Char]}) -join "" 241 | return $this.GetPSAmsiScanResult($Test) 242 | } 243 | 244 | [Void] ResetPSAmsiScanCache() { 245 | $this.ScanCache = @{} 246 | } 247 | } 248 | 249 | function New-PSAmsiScanner { 250 | <# 251 | .SYNOPSIS 252 | 253 | Creates a new PSAmsiScanner object for conducting PSAmsi scans. 254 | Author: Ryan Cobb (@cobbr_io) 255 | License: GNU GPLv3 256 | Required Dependecies: PSAmsiScanner 257 | Optional Dependencies: none 258 | 259 | .DESCRIPTION 260 | 261 | New-PSAmsiScanner creates a new PSAmsiScanner object for conducting PSAmsi scans. 262 | 263 | .PARAMETER AppName 264 | 265 | The name of the Application that will be submitting PSAmsi scans through the PSAmsiScanner. 266 | 267 | .PARAMETER AlertLimit 268 | 269 | Specifies the maximum amount of AMSI alerts this PSAmsiScanner is allowed to generate. 270 | 271 | .PARAMETER Delay 272 | 273 | Specifies the amount of time (in seconds) this PSAmsiScanner will wait between generated AMSI alerts. 274 | 275 | .PARAMETER ScanCache 276 | 277 | Specify a pre-computed hashtable of cached PSAmsiScanResults that this PSAmsiScanner will use. 278 | 279 | .PARAMETER DisableCache 280 | 281 | Disabled the caching and use of cached PSAmsiScanResults for this PSAmsiScanner. Every request will guaranteed 282 | to be submitted to the AMSI AntiMawlare provider if caching is disabled. Default is cache enabled. 283 | 284 | .OUTPUTS 285 | 286 | PSAmsiScanner 287 | 288 | .EXAMPLE 289 | 290 | New-PSAmsiScanner 291 | 292 | .EXAMPLE 293 | 294 | New-PSAmsiScanner -AppName "PSAmsi" -AlertLimit 100 -Delay 1 295 | 296 | .NOTES 297 | 298 | New-PSAmsiScanner is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 299 | 300 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 301 | 302 | #> 303 | Param ( 304 | [Parameter(Position = 0)] 305 | [ValidateNotNullOrEmpty()] 306 | [String] $AppName = "PSAmsi", 307 | 308 | [Parameter(Position = 1)] 309 | [ValidateRange(0, [Int]::MaxValue)] 310 | [Int] $AlertLimit = 0, 311 | 312 | [Parameter(Position = 2)] 313 | [ValidateRange(0,[Int]::MaxValue)] 314 | [Int] $Delay = 0, 315 | 316 | [Parameter(Position = 3)] 317 | [ValidateNotNull()] 318 | [HashTable] $ScanCache = @{}, 319 | 320 | [Parameter(Position = 4)] 321 | [ValidateNotNullOrEmpty()] 322 | [String[]] $ScanBlacklist = @(), 323 | 324 | [Parameter(Position = 5)] 325 | [ValidateNotNullOrEmpty()] 326 | [String[]] $ScanWhitelist = @(), 327 | 328 | [Switch] $DisableCache, 329 | 330 | [Switch] $OnlyUseBlacklist 331 | ) 332 | If ($DisableCache) { 333 | $PSAmsiScanner = [PSAmsiScanner]::new($AppName, $False, $AlertLimit, $Delay, $ScanBlacklist, $ScanWhitelist) 334 | } 335 | Else { 336 | $PSAmsiScanner = [PSAmsiScanner]::new($AppName, $ScanCache, $AlertLimit, $Delay, $ScanBlacklist, $ScanWhitelist) 337 | } 338 | If ($OnlyUseBlacklist) { $PSAmsiScanner.OnlyUseBlacklist = $True } 339 | 340 | $PSAmsiScanner 341 | } 342 | 343 | function Get-PSAmsiScanResult { 344 | <# 345 | .SYNOPSIS 346 | 347 | Gets the result of a PSAmsiScan on a given string using a given PSAmsiScanner. 348 | 349 | Author: Ryan Cobb (@cobbr_io) 350 | License: GNU GPLv3 351 | Required Dependecies: PSAmsiScanner 352 | Optional Dependencies: none 353 | 354 | .DESCRIPTION 355 | 356 | Get-PSAmsiScanResult gets the result of a PSAmsiScan on a given string using a given PSAmsiScanner 357 | to determine if the current AMSI AntiMalware Provider detects the string as malicious. 358 | 359 | .PARAMETER ScriptString 360 | 361 | The string containing the script to be scanned. 362 | 363 | .PARAMETER ScriptBlock 364 | 365 | The ScriptBlock containing the script to be scanned. 366 | 367 | .PARAMETER ScriptPath 368 | 369 | The Path to the script to be scanned. 370 | 371 | .PARAMETER ScriptUri 372 | 373 | The URI of the script to be scanned. 374 | 375 | .OUTPUTS 376 | 377 | PSCustomObject 378 | 379 | .EXAMPLE 380 | 381 | Get-PSAmsiScanResult -ScriptString "Write-Host example" 382 | 383 | .EXAMPLE 384 | 385 | Get-PSAmsiScanResult -ScriptBlock { Write-Host test } 386 | 387 | .EXAMPLE 388 | 389 | Get-PSAmsiScanResult -ScriptPath ./Example.ps1 390 | 391 | .EXAMPLE 392 | 393 | Get-PSAmsiScanResult -ScriptUri 'http://example.com/Example.ps1' 394 | 395 | .NOTES 396 | 397 | Get-PSAmsiScanResult is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 398 | 399 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 400 | 401 | #> 402 | 403 | [CmdletBinding(DefaultParameterSetName = "ByString")] Param ( 404 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 405 | [ValidateNotNullOrEmpty()] 406 | [String] $ScriptString, 407 | 408 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 409 | [ValidateNotNullOrEmpty()] 410 | [ScriptBlock] $ScriptBlock, 411 | 412 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 413 | [ValidateScript({Test-Path $_ -PathType leaf})] 414 | [Alias('PSPath')] 415 | [String] $ScriptPath, 416 | 417 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 418 | [ValidateScript({$_.Scheme -match 'http|https'})] 419 | [Uri] $ScriptUri, 420 | 421 | [Parameter(Position = 1)] 422 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 423 | [System.Object] $PSAmsiScanner, 424 | 425 | [Parameter(Position = 2)] 426 | [ValidateNotNullOrEmpty()] 427 | [String] $ContentName 428 | ) 429 | Begin { 430 | $CreatedPSAmsiScanner = $False 431 | If (-not $PSAmsiScanner) { 432 | $PSAmsiScanner = New-PSAmsiScanner 433 | $CreatedPSAmsiScanner = $True 434 | } 435 | } 436 | Process { 437 | If ($ScriptString) { 438 | If ($ContentName) { $PSAmsiScanner.GetPSAmsiScanResult($ScriptString, $ContentName) } 439 | Else { $PSAmsiScanner.GetPSAmsiScanResult($ScriptString) } 440 | } 441 | ElseIf ($ScriptBlock) { 442 | If ($ContentName) { $PSAmsiScanner.GetPSAmsiScanResult($ScriptBlock, $ContentName) } 443 | Else { $PSAmsiScanner.GetPSAmsiScanResult($ScriptBlock) } 444 | } 445 | ElseIf ($ScriptPath) { 446 | If ($ContentName) { $PSAmsiScanner.GetPSAmsiScanResult((Get-ChildItem $ScriptPath), $ContentName) } 447 | Else { $PSAmsiScanner.GetPSAmsiScanResult((Get-ChildItem $ScriptPath)) } 448 | } 449 | ElseIf ($ScriptUri) { 450 | If ($ContentName) { $PSAmsiScanner.GetPSAmsiScanResult($ScriptUri) } 451 | Else { $PSAmsiScanner.GetPSAmsiScanResult($ScriptUri) } 452 | } 453 | } 454 | End { 455 | If ($CreatedPSAmsiScanner) { 456 | $PSAmsiScanner.Dispose() 457 | } 458 | } 459 | } 460 | 461 | function Reset-PSAmsiScanCache { 462 | <# 463 | .SYNOPSIS 464 | 465 | Resets the ScanCache of a given PSAmsiScanner. 466 | 467 | Author: Ryan Cobb (@cobbr_io) 468 | License: GNU GPLv3 469 | Required Dependecies: PSAmsiScanner 470 | Optional Dependencies: none 471 | 472 | .DESCRIPTION 473 | 474 | Reset-PSAmsiScanCache resets the ScanCache of a given PSAmsiScanner so all 475 | new requests will return fresh responses from the AMSI AntiMalware Provider. 476 | 477 | .EXAMPLE 478 | 479 | Reset-PSAmsiScanCache 480 | 481 | .NOTES 482 | 483 | Reset-PSAmsiScanCache is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 484 | 485 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 486 | 487 | #> 488 | 489 | Param ( 490 | [Parameter(Position = 0, Mandatory)] [ValidateNotNull()] 491 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 492 | [System.Object] $PSAmsiScanner 493 | ) 494 | $PSAmsiScanner.ResetPSAmsiScanCache() 495 | } 496 | 497 | function Test-EicarDetection { 498 | <# 499 | .SYNOPSIS 500 | 501 | Tests if the current AMSI AntiMalware Provider detects a standard test EICAR payload. 502 | 503 | Author: Ryan Cobb (@cobbr_io) 504 | License: GNU GPLv3 505 | Required Dependecies: PSAmsiScanner 506 | Optional Dependencies: none 507 | 508 | .DESCRIPTION 509 | 510 | Test-EicarDetection tests if the current AMSI AntiMalware Provider detects a standard test EICAR payload. If your AMSI AntiMalware 511 | Provider does not detect an EICAR payload it is likely that your AMSI AntiMalware Provider is being somewhat deceptive when they say 512 | they have implemented AMSI support. 513 | 514 | .EXAMPLE 515 | 516 | Test-EicarDetection 517 | 518 | .EXAMPLE 519 | 520 | Test-EicarDetection -PSAmsiScanner $Scanner 521 | 522 | .NOTES 523 | 524 | Test-EicarDetection is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 525 | 526 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 527 | 528 | #> 529 | 530 | Param ( 531 | [Parameter(Position = 0)] [ValidateNotNull()] 532 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 533 | [System.Object] $PSAmsiScanner 534 | ) 535 | $CreatedPSAmsiScanner = $False 536 | If (-not $PSAmsiScanner) { 537 | $PSAmsiScanner = New-PSAmsiScanner 538 | $CreatedPSAmsiScanner = $True 539 | } 540 | 541 | $PSAmsiScanner.TestEicarDetection() 542 | 543 | If ($CreatedPSAmsiScanner) { 544 | $PSAmsiScanner.Dispose() 545 | } 546 | } -------------------------------------------------------------------------------- /PSAmsi/PSReflect.ps1: -------------------------------------------------------------------------------- 1 | #Requires -Version 2 2 | 3 | ######################################################## 4 | # 5 | # PSReflect code for Windows API access 6 | # Author: @mattifestation 7 | # https://raw.githubusercontent.com/mattifestation/PSReflect/master/PSReflect.psm1 8 | # 9 | ######################################################## 10 | 11 | function New-InMemoryModule 12 | { 13 | <# 14 | .SYNOPSIS 15 | Creates an in-memory assembly and module 16 | Author: Matthew Graeber (@mattifestation) 17 | License: BSD 3-Clause 18 | Required Dependencies: None 19 | Optional Dependencies: None 20 | 21 | .DESCRIPTION 22 | When defining custom enums, structs, and unmanaged functions, it is 23 | necessary to associate to an assembly module. This helper function 24 | creates an in-memory module that can be passed to the 'enum', 25 | 'struct', and Add-Win32Type functions. 26 | .PARAMETER ModuleName 27 | Specifies the desired name for the in-memory assembly and module. If 28 | ModuleName is not provided, it will default to a GUID. 29 | .EXAMPLE 30 | $Module = New-InMemoryModule -ModuleName Win32 31 | #> 32 | 33 | Param 34 | ( 35 | [Parameter(Position = 0)] 36 | [ValidateNotNullOrEmpty()] 37 | [String] 38 | $ModuleName = [Guid]::NewGuid().ToString() 39 | ) 40 | 41 | $AppDomain = [Reflection.Assembly].Assembly.GetType('System.AppDomain').GetProperty('CurrentDomain').GetValue($null, @()) 42 | $LoadedAssemblies = $AppDomain.GetAssemblies() 43 | 44 | foreach ($Assembly in $LoadedAssemblies) { 45 | if ($Assembly.FullName -and ($Assembly.FullName.Split(',')[0] -eq $ModuleName)) { 46 | return $Assembly 47 | } 48 | } 49 | 50 | $DynAssembly = New-Object Reflection.AssemblyName($ModuleName) 51 | $Domain = $AppDomain 52 | $AssemblyBuilder = $Domain.DefineDynamicAssembly($DynAssembly, 'Run') 53 | $ModuleBuilder = $AssemblyBuilder.DefineDynamicModule($ModuleName, $False) 54 | 55 | return $ModuleBuilder 56 | } 57 | 58 | 59 | # A helper function used to reduce typing while defining function 60 | # prototypes for Add-Win32Type. 61 | function func 62 | { 63 | Param 64 | ( 65 | [Parameter(Position = 0, Mandatory = $True)] 66 | [String] 67 | $DllName, 68 | 69 | [Parameter(Position = 1, Mandatory = $True)] 70 | [string] 71 | $FunctionName, 72 | 73 | [Parameter(Position = 2, Mandatory = $True)] 74 | [Type] 75 | $ReturnType, 76 | 77 | [Parameter(Position = 3)] 78 | [Type[]] 79 | $ParameterTypes, 80 | 81 | [Parameter(Position = 4)] 82 | [Runtime.InteropServices.CallingConvention] 83 | $NativeCallingConvention, 84 | 85 | [Parameter(Position = 5)] 86 | [Runtime.InteropServices.CharSet] 87 | $Charset, 88 | 89 | [String] 90 | $EntryPoint, 91 | 92 | [Switch] 93 | $SetLastError 94 | ) 95 | 96 | $Properties = @{ 97 | DllName = $DllName 98 | FunctionName = $FunctionName 99 | ReturnType = $ReturnType 100 | } 101 | 102 | if ($ParameterTypes) { $Properties['ParameterTypes'] = $ParameterTypes } 103 | if ($NativeCallingConvention) { $Properties['NativeCallingConvention'] = $NativeCallingConvention } 104 | if ($Charset) { $Properties['Charset'] = $Charset } 105 | if ($SetLastError) { $Properties['SetLastError'] = $SetLastError } 106 | if ($EntryPoint) { $Properties['EntryPoint'] = $EntryPoint } 107 | 108 | New-Object PSObject -Property $Properties 109 | } 110 | 111 | 112 | function Add-Win32Type 113 | { 114 | <# 115 | .SYNOPSIS 116 | Creates a .NET type for an unmanaged Win32 function. 117 | Author: Matthew Graeber (@mattifestation) 118 | License: BSD 3-Clause 119 | Required Dependencies: None 120 | Optional Dependencies: func 121 | 122 | .DESCRIPTION 123 | Add-Win32Type enables you to easily interact with unmanaged (i.e. 124 | Win32 unmanaged) functions in PowerShell. After providing 125 | Add-Win32Type with a function signature, a .NET type is created 126 | using reflection (i.e. csc.exe is never called like with Add-Type). 127 | The 'func' helper function can be used to reduce typing when defining 128 | multiple function definitions. 129 | .PARAMETER DllName 130 | The name of the DLL. 131 | .PARAMETER FunctionName 132 | The name of the target function. 133 | .PARAMETER EntryPoint 134 | The DLL export function name. This argument should be specified if the 135 | specified function name is different than the name of the exported 136 | function. 137 | .PARAMETER ReturnType 138 | The return type of the function. 139 | .PARAMETER ParameterTypes 140 | The function parameters. 141 | .PARAMETER NativeCallingConvention 142 | Specifies the native calling convention of the function. Defaults to 143 | stdcall. 144 | .PARAMETER Charset 145 | If you need to explicitly call an 'A' or 'W' Win32 function, you can 146 | specify the character set. 147 | .PARAMETER SetLastError 148 | Indicates whether the callee calls the SetLastError Win32 API 149 | function before returning from the attributed method. 150 | .PARAMETER Module 151 | The in-memory module that will host the functions. Use 152 | New-InMemoryModule to define an in-memory module. 153 | .PARAMETER Namespace 154 | An optional namespace to prepend to the type. Add-Win32Type defaults 155 | to a namespace consisting only of the name of the DLL. 156 | .EXAMPLE 157 | $Mod = New-InMemoryModule -ModuleName Win32 158 | $FunctionDefinitions = @( 159 | (func kernel32 GetProcAddress ([IntPtr]) @([IntPtr], [String]) -Charset Ansi -SetLastError), 160 | (func kernel32 GetModuleHandle ([Intptr]) @([String]) -SetLastError), 161 | (func ntdll RtlGetCurrentPeb ([IntPtr]) @()) 162 | ) 163 | $Types = $FunctionDefinitions | Add-Win32Type -Module $Mod -Namespace 'Win32' 164 | $Kernel32 = $Types['kernel32'] 165 | $Ntdll = $Types['ntdll'] 166 | $Ntdll::RtlGetCurrentPeb() 167 | $ntdllbase = $Kernel32::GetModuleHandle('ntdll') 168 | $Kernel32::GetProcAddress($ntdllbase, 'RtlGetCurrentPeb') 169 | .NOTES 170 | Inspired by Lee Holmes' Invoke-WindowsApi http://poshcode.org/2189 171 | When defining multiple function prototypes, it is ideal to provide 172 | Add-Win32Type with an array of function signatures. That way, they 173 | are all incorporated into the same in-memory module. 174 | #> 175 | 176 | [OutputType([Hashtable])] 177 | Param( 178 | [Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)] 179 | [String] 180 | [ValidateNotNullOrEmpty()] 181 | $DllName, 182 | 183 | [Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)] 184 | [String] 185 | [ValidateNotNullOrEmpty()] 186 | $FunctionName, 187 | 188 | [Parameter(ValueFromPipelineByPropertyName = $True)] 189 | [String] 190 | [ValidateNotNullOrEmpty()] 191 | $EntryPoint, 192 | 193 | [Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)] 194 | [Type] 195 | $ReturnType, 196 | 197 | [Parameter(ValueFromPipelineByPropertyName = $True)] 198 | [Type[]] 199 | $ParameterTypes, 200 | 201 | [Parameter(ValueFromPipelineByPropertyName = $True)] 202 | [Runtime.InteropServices.CallingConvention] 203 | $NativeCallingConvention = [Runtime.InteropServices.CallingConvention]::StdCall, 204 | 205 | [Parameter(ValueFromPipelineByPropertyName = $True)] 206 | [Runtime.InteropServices.CharSet] 207 | $Charset = [Runtime.InteropServices.CharSet]::Auto, 208 | 209 | [Parameter(ValueFromPipelineByPropertyName = $True)] 210 | [Switch] 211 | $SetLastError, 212 | 213 | [Parameter(Mandatory = $True)] 214 | [ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})] 215 | $Module, 216 | 217 | [ValidateNotNull()] 218 | [String] 219 | $Namespace = '' 220 | ) 221 | 222 | BEGIN 223 | { 224 | $TypeHash = @{} 225 | } 226 | 227 | PROCESS 228 | { 229 | if ($Module -is [Reflection.Assembly]) 230 | { 231 | if ($Namespace) 232 | { 233 | $TypeHash[$DllName] = $Module.GetType("$Namespace.$DllName") 234 | } 235 | else 236 | { 237 | $TypeHash[$DllName] = $Module.GetType($DllName) 238 | } 239 | } 240 | else 241 | { 242 | # Define one type for each DLL 243 | if (!$TypeHash.ContainsKey($DllName)) 244 | { 245 | if ($Namespace) 246 | { 247 | $TypeHash[$DllName] = $Module.DefineType("$Namespace.$DllName", 'Public,BeforeFieldInit') 248 | } 249 | else 250 | { 251 | $TypeHash[$DllName] = $Module.DefineType($DllName, 'Public,BeforeFieldInit') 252 | } 253 | } 254 | 255 | $Method = $TypeHash[$DllName].DefineMethod( 256 | $FunctionName, 257 | 'Public,Static,PinvokeImpl', 258 | $ReturnType, 259 | $ParameterTypes) 260 | 261 | # Make each ByRef parameter an Out parameter 262 | $i = 1 263 | foreach($Parameter in $ParameterTypes) 264 | { 265 | if ($Parameter.IsByRef) 266 | { 267 | [void] $Method.DefineParameter($i, 'Out', $null) 268 | } 269 | 270 | $i++ 271 | } 272 | 273 | $DllImport = [Runtime.InteropServices.DllImportAttribute] 274 | $SetLastErrorField = $DllImport.GetField('SetLastError') 275 | $CallingConventionField = $DllImport.GetField('CallingConvention') 276 | $CharsetField = $DllImport.GetField('CharSet') 277 | $EntryPointField = $DllImport.GetField('EntryPoint') 278 | if ($SetLastError) { $SLEValue = $True } else { $SLEValue = $False } 279 | 280 | if ($EntryPoint) { $ExportedFuncName = $EntryPoint } else { $ExportedFuncName = $FunctionName } 281 | 282 | # Equivalent to C# version of [DllImport(DllName)] 283 | $Constructor = [Runtime.InteropServices.DllImportAttribute].GetConstructor([String]) 284 | $DllImportAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($Constructor, 285 | $DllName, 286 | [Reflection.PropertyInfo[]] @(), 287 | [Object[]] @(), 288 | [Reflection.FieldInfo[]] @($SetLastErrorField, 289 | $CallingConventionField, 290 | $CharsetField, 291 | $EntryPointField), 292 | [Object[]] @($SLEValue, 293 | ([Runtime.InteropServices.CallingConvention] $NativeCallingConvention), 294 | ([Runtime.InteropServices.CharSet] $Charset), 295 | $ExportedFuncName)) 296 | 297 | $Method.SetCustomAttribute($DllImportAttribute) 298 | } 299 | } 300 | 301 | END 302 | { 303 | if ($Module -is [Reflection.Assembly]) 304 | { 305 | return $TypeHash 306 | } 307 | 308 | $ReturnTypes = @{} 309 | 310 | foreach ($Key in $TypeHash.Keys) 311 | { 312 | $Type = $TypeHash[$Key].CreateType() 313 | 314 | $ReturnTypes[$Key] = $Type 315 | } 316 | 317 | return $ReturnTypes 318 | } 319 | } 320 | 321 | 322 | function psenum 323 | { 324 | <# 325 | .SYNOPSIS 326 | Creates an in-memory enumeration for use in your PowerShell session. 327 | Author: Matthew Graeber (@mattifestation) 328 | License: BSD 3-Clause 329 | Required Dependencies: None 330 | Optional Dependencies: None 331 | 332 | .DESCRIPTION 333 | The 'psenum' function facilitates the creation of enums entirely in 334 | memory using as close to a "C style" as PowerShell will allow. 335 | .PARAMETER Module 336 | The in-memory module that will host the enum. Use 337 | New-InMemoryModule to define an in-memory module. 338 | .PARAMETER FullName 339 | The fully-qualified name of the enum. 340 | .PARAMETER Type 341 | The type of each enum element. 342 | .PARAMETER EnumElements 343 | A hashtable of enum elements. 344 | .PARAMETER Bitfield 345 | Specifies that the enum should be treated as a bitfield. 346 | .EXAMPLE 347 | $Mod = New-InMemoryModule -ModuleName Win32 348 | $ImageSubsystem = psenum $Mod PE.IMAGE_SUBSYSTEM UInt16 @{ 349 | UNKNOWN = 0 350 | NATIVE = 1 # Image doesn't require a subsystem. 351 | WINDOWS_GUI = 2 # Image runs in the Windows GUI subsystem. 352 | WINDOWS_CUI = 3 # Image runs in the Windows character subsystem. 353 | OS2_CUI = 5 # Image runs in the OS/2 character subsystem. 354 | POSIX_CUI = 7 # Image runs in the Posix character subsystem. 355 | NATIVE_WINDOWS = 8 # Image is a native Win9x driver. 356 | WINDOWS_CE_GUI = 9 # Image runs in the Windows CE subsystem. 357 | EFI_APPLICATION = 10 358 | EFI_BOOT_SERVICE_DRIVER = 11 359 | EFI_RUNTIME_DRIVER = 12 360 | EFI_ROM = 13 361 | XBOX = 14 362 | WINDOWS_BOOT_APPLICATION = 16 363 | } 364 | .NOTES 365 | PowerShell purists may disagree with the naming of this function but 366 | again, this was developed in such a way so as to emulate a "C style" 367 | definition as closely as possible. Sorry, I'm not going to name it 368 | New-Enum. :P 369 | #> 370 | 371 | [OutputType([Type])] 372 | Param 373 | ( 374 | [Parameter(Position = 0, Mandatory = $True)] 375 | [ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})] 376 | $Module, 377 | 378 | [Parameter(Position = 1, Mandatory = $True)] 379 | [ValidateNotNullOrEmpty()] 380 | [String] 381 | $FullName, 382 | 383 | [Parameter(Position = 2, Mandatory = $True)] 384 | [Type] 385 | $Type, 386 | 387 | [Parameter(Position = 3, Mandatory = $True)] 388 | [ValidateNotNullOrEmpty()] 389 | [Hashtable] 390 | $EnumElements, 391 | 392 | [Switch] 393 | $Bitfield 394 | ) 395 | 396 | if ($Module -is [Reflection.Assembly]) 397 | { 398 | return ($Module.GetType($FullName)) 399 | } 400 | 401 | $EnumType = $Type -as [Type] 402 | 403 | $EnumBuilder = $Module.DefineEnum($FullName, 'Public', $EnumType) 404 | 405 | if ($Bitfield) 406 | { 407 | $FlagsConstructor = [FlagsAttribute].GetConstructor(@()) 408 | $FlagsCustomAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($FlagsConstructor, @()) 409 | $EnumBuilder.SetCustomAttribute($FlagsCustomAttribute) 410 | } 411 | 412 | foreach ($Key in $EnumElements.Keys) 413 | { 414 | # Apply the specified enum type to each element 415 | $null = $EnumBuilder.DefineLiteral($Key, $EnumElements[$Key] -as $EnumType) 416 | } 417 | 418 | $EnumBuilder.CreateType() 419 | } 420 | 421 | 422 | # A helper function used to reduce typing while defining struct 423 | # fields. 424 | function field 425 | { 426 | Param 427 | ( 428 | [Parameter(Position = 0, Mandatory = $True)] 429 | [UInt16] 430 | $Position, 431 | 432 | [Parameter(Position = 1, Mandatory = $True)] 433 | [Type] 434 | $Type, 435 | 436 | [Parameter(Position = 2)] 437 | [UInt16] 438 | $Offset, 439 | 440 | [Object[]] 441 | $MarshalAs 442 | ) 443 | 444 | @{ 445 | Position = $Position 446 | Type = $Type -as [Type] 447 | Offset = $Offset 448 | MarshalAs = $MarshalAs 449 | } 450 | } 451 | 452 | 453 | function struct 454 | { 455 | <# 456 | .SYNOPSIS 457 | Creates an in-memory struct for use in your PowerShell session. 458 | Author: Matthew Graeber (@mattifestation) 459 | License: BSD 3-Clause 460 | Required Dependencies: None 461 | Optional Dependencies: field 462 | 463 | .DESCRIPTION 464 | The 'struct' function facilitates the creation of structs entirely in 465 | memory using as close to a "C style" as PowerShell will allow. Struct 466 | fields are specified using a hashtable where each field of the struct 467 | is comprosed of the order in which it should be defined, its .NET 468 | type, and optionally, its offset and special marshaling attributes. 469 | One of the features of 'struct' is that after your struct is defined, 470 | it will come with a built-in GetSize method as well as an explicit 471 | converter so that you can easily cast an IntPtr to the struct without 472 | relying upon calling SizeOf and/or PtrToStructure in the Marshal 473 | class. 474 | .PARAMETER Module 475 | The in-memory module that will host the struct. Use 476 | New-InMemoryModule to define an in-memory module. 477 | .PARAMETER FullName 478 | The fully-qualified name of the struct. 479 | .PARAMETER StructFields 480 | A hashtable of fields. Use the 'field' helper function to ease 481 | defining each field. 482 | .PARAMETER PackingSize 483 | Specifies the memory alignment of fields. 484 | .PARAMETER ExplicitLayout 485 | Indicates that an explicit offset for each field will be specified. 486 | .PARAMETER CharSet 487 | Dictates which character set marshaled strings should use. 488 | .EXAMPLE 489 | $Mod = New-InMemoryModule -ModuleName Win32 490 | $ImageDosSignature = psenum $Mod PE.IMAGE_DOS_SIGNATURE UInt16 @{ 491 | DOS_SIGNATURE = 0x5A4D 492 | OS2_SIGNATURE = 0x454E 493 | OS2_SIGNATURE_LE = 0x454C 494 | VXD_SIGNATURE = 0x454C 495 | } 496 | $ImageDosHeader = struct $Mod PE.IMAGE_DOS_HEADER @{ 497 | e_magic = field 0 $ImageDosSignature 498 | e_cblp = field 1 UInt16 499 | e_cp = field 2 UInt16 500 | e_crlc = field 3 UInt16 501 | e_cparhdr = field 4 UInt16 502 | e_minalloc = field 5 UInt16 503 | e_maxalloc = field 6 UInt16 504 | e_ss = field 7 UInt16 505 | e_sp = field 8 UInt16 506 | e_csum = field 9 UInt16 507 | e_ip = field 10 UInt16 508 | e_cs = field 11 UInt16 509 | e_lfarlc = field 12 UInt16 510 | e_ovno = field 13 UInt16 511 | e_res = field 14 UInt16[] -MarshalAs @('ByValArray', 4) 512 | e_oemid = field 15 UInt16 513 | e_oeminfo = field 16 UInt16 514 | e_res2 = field 17 UInt16[] -MarshalAs @('ByValArray', 10) 515 | e_lfanew = field 18 Int32 516 | } 517 | # Example of using an explicit layout in order to create a union. 518 | $TestUnion = struct $Mod TestUnion @{ 519 | field1 = field 0 UInt32 0 520 | field2 = field 1 IntPtr 0 521 | } -ExplicitLayout 522 | .NOTES 523 | PowerShell purists may disagree with the naming of this function but 524 | again, this was developed in such a way so as to emulate a "C style" 525 | definition as closely as possible. Sorry, I'm not going to name it 526 | New-Struct. :P 527 | #> 528 | 529 | [OutputType([Type])] 530 | Param 531 | ( 532 | [Parameter(Position = 1, Mandatory = $True)] 533 | [ValidateScript({($_ -is [Reflection.Emit.ModuleBuilder]) -or ($_ -is [Reflection.Assembly])})] 534 | $Module, 535 | 536 | [Parameter(Position = 2, Mandatory = $True)] 537 | [ValidateNotNullOrEmpty()] 538 | [String] 539 | $FullName, 540 | 541 | [Parameter(Position = 3, Mandatory = $True)] 542 | [ValidateNotNullOrEmpty()] 543 | [Hashtable] 544 | $StructFields, 545 | 546 | [Reflection.Emit.PackingSize] 547 | $PackingSize = [Reflection.Emit.PackingSize]::Unspecified, 548 | 549 | [Switch] 550 | $ExplicitLayout, 551 | 552 | [System.Runtime.InteropServices.CharSet] 553 | $CharSet = [System.Runtime.InteropServices.CharSet]::Ansi 554 | ) 555 | 556 | if ($Module -is [Reflection.Assembly]) 557 | { 558 | return ($Module.GetType($FullName)) 559 | } 560 | 561 | [Reflection.TypeAttributes] $StructAttributes = 'Class, 562 | Public, 563 | Sealed, 564 | BeforeFieldInit' 565 | 566 | if ($ExplicitLayout) 567 | { 568 | $StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::ExplicitLayout 569 | } 570 | else 571 | { 572 | $StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::SequentialLayout 573 | } 574 | 575 | switch($CharSet) 576 | { 577 | Ansi 578 | { 579 | $StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::AnsiClass 580 | } 581 | Auto 582 | { 583 | $StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::AutoClass 584 | } 585 | Unicode 586 | { 587 | $StructAttributes = $StructAttributes -bor [Reflection.TypeAttributes]::UnicodeClass 588 | s} 589 | } 590 | 591 | $StructBuilder = $Module.DefineType($FullName, $StructAttributes, [ValueType], $PackingSize) 592 | $ConstructorInfo = [Runtime.InteropServices.MarshalAsAttribute].GetConstructors()[0] 593 | $SizeConst = @([Runtime.InteropServices.MarshalAsAttribute].GetField('SizeConst')) 594 | 595 | $Fields = New-Object Hashtable[]($StructFields.Count) 596 | 597 | # Sort each field according to the orders specified 598 | # Unfortunately, PSv2 doesn't have the luxury of the 599 | # hashtable [Ordered] accelerator. 600 | foreach ($Field in $StructFields.Keys) 601 | { 602 | $Index = $StructFields[$Field]['Position'] 603 | $Fields[$Index] = @{FieldName = $Field; Properties = $StructFields[$Field]} 604 | } 605 | 606 | foreach ($Field in $Fields) 607 | { 608 | $FieldName = $Field['FieldName'] 609 | $FieldProp = $Field['Properties'] 610 | 611 | $Offset = $FieldProp['Offset'] 612 | $Type = $FieldProp['Type'] 613 | $MarshalAs = $FieldProp['MarshalAs'] 614 | 615 | $NewField = $StructBuilder.DefineField($FieldName, $Type, 'Public') 616 | 617 | if ($MarshalAs) 618 | { 619 | $UnmanagedType = $MarshalAs[0] -as ([Runtime.InteropServices.UnmanagedType]) 620 | if ($MarshalAs[1]) 621 | { 622 | $Size = $MarshalAs[1] 623 | $AttribBuilder = New-Object Reflection.Emit.CustomAttributeBuilder($ConstructorInfo, 624 | $UnmanagedType, $SizeConst, @($Size)) 625 | } 626 | else 627 | { 628 | $AttribBuilder = New-Object Reflection.Emit.CustomAttributeBuilder($ConstructorInfo, [Object[]] @($UnmanagedType)) 629 | } 630 | 631 | $NewField.SetCustomAttribute($AttribBuilder) 632 | } 633 | 634 | if ($ExplicitLayout) { $NewField.SetOffset($Offset) } 635 | } 636 | 637 | # Make the struct aware of its own size. 638 | # No more having to call [Runtime.InteropServices.Marshal]::SizeOf! 639 | $SizeMethod = $StructBuilder.DefineMethod('GetSize', 640 | 'Public, Static', 641 | [Int], 642 | [Type[]] @()) 643 | $ILGenerator = $SizeMethod.GetILGenerator() 644 | # Thanks for the help, Jason Shirk! 645 | $ILGenerator.Emit([Reflection.Emit.OpCodes]::Ldtoken, $StructBuilder) 646 | $ILGenerator.Emit([Reflection.Emit.OpCodes]::Call, 647 | [Type].GetMethod('GetTypeFromHandle')) 648 | $ILGenerator.Emit([Reflection.Emit.OpCodes]::Call, 649 | [Runtime.InteropServices.Marshal].GetMethod('SizeOf', [Type[]] @([Type]))) 650 | $ILGenerator.Emit([Reflection.Emit.OpCodes]::Ret) 651 | 652 | # Allow for explicit casting from an IntPtr 653 | # No more having to call [Runtime.InteropServices.Marshal]::PtrToStructure! 654 | $ImplicitConverter = $StructBuilder.DefineMethod('op_Implicit', 655 | 'PrivateScope, Public, Static, HideBySig, SpecialName', 656 | $StructBuilder, 657 | [Type[]] @([IntPtr])) 658 | $ILGenerator2 = $ImplicitConverter.GetILGenerator() 659 | $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Nop) 660 | $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ldarg_0) 661 | $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ldtoken, $StructBuilder) 662 | $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Call, 663 | [Type].GetMethod('GetTypeFromHandle')) 664 | $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Call, 665 | [Runtime.InteropServices.Marshal].GetMethod('PtrToStructure', [Type[]] @([IntPtr], [Type]))) 666 | $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Unbox_Any, $StructBuilder) 667 | $ILGenerator2.Emit([Reflection.Emit.OpCodes]::Ret) 668 | 669 | $StructBuilder.CreateType() 670 | } -------------------------------------------------------------------------------- /PSAmsi/Obfuscators/PowerShell/PowerShellObfuscator.ps1: -------------------------------------------------------------------------------- 1 | class PowerShellObfuscator { 2 | 3 | $ObfuscationCache = @{} 4 | 5 | PowerShellObfuscator() {} 6 | 7 | PowerShellObfuscator([HashTable] $ObfuscationCache) { 8 | $this.ObfuscationCache = $ObfuscationCache 9 | } 10 | 11 | [String] GetMinimallyObfuscated([String] $ScriptString, [Object] $PSAmsiScanner, [Object[]] $AmsiSignatures) { 12 | $CreatedPSAmsiScanner = $False 13 | If (-not $PSAmsiScanner) { 14 | $CreatedPSAmsiScanner = $True 15 | $PSAmsiScanner = New-PSAmsiScanner 16 | } ElseIf (-not $PSAmsiScanner.GetType().Name -eq 'PSAmsiScanner') { 17 | throw "PSAmsiScanner must be of type [PSAmsiScanner]" 18 | } 19 | 20 | If ($this.ObfuscationCache.Contains($ScriptString)) { return $this.ObfuscationCache[$ScriptString] } 21 | 22 | $PSTokens = Get-PSTokens -ScriptString $ScriptString 23 | $OriginalScript = $ScriptString 24 | 25 | # Get all the AmsiFlaggedStrings that we must obfuscate, if they were not provided 26 | If (-not $AmsiSignatures) { 27 | # No need to get the AbstractSyntaxTree unless we must search for AmsiFlaggedStrings 28 | $AbstractSyntaxTree = Get-Ast -ScriptString $ScriptString 29 | $AmsiSignatures = Find-AmsiSignatures -Ast $AbstractSyntaxTree -PSTokens $PSTokens -PSAmsiScanner $PSAmsiScanner | Sort-Object -Descending { $_.StartOffset} 30 | } 31 | 32 | $AmsiAstSignatures = @() 33 | If ($AmsiSignatures.Count -gt 0) { 34 | $AmsiAstSignatures = $AmsiSignatures | ? { $_.SignatureType.Contains('Ast') } 35 | } 36 | ForEach ($AmsiAstSignature in $AmsiAstSignatures) { 37 | If ($this.ObfuscationCache.Contains($AmsiAstSignature.SignatureContent)) { continue } 38 | 39 | $ObfuscatedAstExtent = Out-ObfuscatedAst -ScriptString $AmsiAstSignature.SignatureContent 40 | If (-not (Get-PSAmsiScanResult -ScriptString $ObfuscatedAstExtent -PSAmsiScanner $PSAmsiScanner)) { 41 | Write-Verbose "[Get-MinimallyObfuscated] Out-ObfuscatedAst obfuscation successful!" 42 | $this.ObfuscationCache[$AmsiAstSignature.SignatureContent] = $ObfuscatedAstExtent 43 | } Else { Write-Verbose "[Get-MinimallyObfuscated] Out-ObfuscatedAst obfuscation unsuccessful." } 44 | } 45 | 46 | ForEach($AmsiSignature in $AmsiSignatures) { 47 | If ($this.ObfuscationCache.Contains($AmsiSignature.SignatureContent)) { continue } 48 | 49 | # Reset the ScriptString for each Signature obfuscation iteration, so token indices are correct 50 | # We will actually replace w/ all obfuscated values at the end 51 | $ScriptString = $OriginalScript 52 | $ObfuscationSuccessful = $False 53 | $ObfuscationLevel = 0 54 | # Iterate obuscation levels until obfuscation succeeds 55 | While ((-not $ObfuscationSuccessful) -and ($ObfuscationLevel -lt 4)) { 56 | 57 | $ObfuscationLevel++ 58 | 59 | $MatchingTokenArrays = (Get-MatchingPSTokens -SearchString $OriginalScript -SignatureString $AmsiSignature.SignatureContent -PSTokens $PSTokens) -as [array] 60 | ForEach ($MatchingTokenArray in $MatchingTokenArrays) { 61 | # If obfuscation already found for this string, skip it 62 | If ($this.ObfuscationCache.Contains($MatchingTokenArray.MatchingString)) { continue } 63 | 64 | $MatchingTokens = $MatchingTokenArray.MatchingTokens 65 | $DoneObfuscating = $False 66 | $TokenIndex = 0 67 | # Obfuscate the tokens until the string is no longer flagged 68 | While (-not $DoneObfuscating) { 69 | $MatchingToken = $MatchingTokens[$TokenIndex] 70 | 71 | If ($MatchingToken.Type -eq 'Comment') { 72 | $this.ObfuscationCache[$MatchingTokenArray.MatchingString] = "" 73 | $DoneObfuscating = $True 74 | $ObfuscationSuccessful = $True 75 | } 76 | # Only obfuscate the following token types 77 | ElseIf ($MatchingToken.Type -in @('String', 'Member', 'CommandArgument', 'Command', 'Variable')) { 78 | $ScriptString = Out-ObfuscatedPSToken -ScriptString $ScriptString -PSTokens $MatchingTokens -Index $TokenIndex -ObfuscationLevel $ObfuscationLevel 79 | # Calculate the replacement string for the current AmsiFlaggedString, based on current obfuscation 80 | $ReplacementString = $ScriptString.Substring($MatchingTokenArray.StartIndex, $MatchingTokenArray.Length + ($ScriptString.Length - $OriginalScript.Length)) 81 | # Check if this current replacement string is still flagged 82 | If (-not (Get-PSAmsiScanResult -ScriptString $ReplacementString -PSAmsiScanner $PSAmsiScanner)) { 83 | # Done obfuscating if the resulting string is no longer flagged 84 | $DoneObfuscating = $True 85 | $ObfuscationSuccessful = $True 86 | $this.ObfuscationCache[$MatchingTokenArray.MatchingString] = $ReplacementString 87 | } 88 | } 89 | # If we've run through all the strings and the string is still flagged, obfuscation fails 90 | If (($TokenIndex -ge ($MatchingTokens.Count-1))) { $DoneObfuscating = $True } 91 | 92 | Else { $TokenIndex++ } 93 | } 94 | } 95 | } 96 | } 97 | 98 | $this.ObfuscationCache.Keys | % { 99 | # Replace all the strings at the end 100 | $ScriptString = $ScriptString.Replace($_, $this.ObfuscationCache[$_]) 101 | } 102 | 103 | $this.ObfuscationCache[$OriginalScript] = $ScriptString 104 | 105 | If ($CreatedPSAmsiScanner) { 106 | $PSAmsiScanner.Dispose() 107 | } 108 | 109 | return $ScriptString 110 | } 111 | 112 | [String] GetMinimallyObfuscated([String] $ScriptString, [Object] $PSAmsiScanner) { 113 | $CreatedPSAmsiScanner = $False 114 | If (-not $PSAmsiScanner) { 115 | $CreatedPSAmsiScanner = $True 116 | $PSAmsiScanner = New-PSAmsiScanner 117 | } ElseIf (-not $PSAmsiScanner.GetType().Name -eq 'PSAmsiScanner') { 118 | throw "PSAmsiScanner must be of type [PSAmsiScanner]" 119 | } 120 | 121 | $Detected = $True 122 | $MinimallyObfuscated = $ScriptString 123 | Do { 124 | $MinimallyObfuscated = $this.GetMinimallyObfuscated($MinimallyObfuscated, $PSAmsiScanner, $null) 125 | $Detected = Get-PSAmsiScanResult -ScriptString $MinimallyObfuscated -PSAmsiScanner $PSAmsiScanner 126 | } While($Detected) 127 | 128 | If ($CreatedPSAmsiScanner) { 129 | $PSAmsiScanner.Dispose() 130 | } 131 | 132 | return $MinimallyObfuscated 133 | } 134 | 135 | [String] GetMinimallyObfuscated([String] $ScriptString) { 136 | return $this.GetMinimallyObfuscated($ScriptString, $null) 137 | } 138 | 139 | [String] GetMinimallyObfuscated([ScriptBlock] $ScriptBlock, [Object] $PSAmsiScanner, [Object[]] $AmsiSignatures) { 140 | $ScriptString = $ScriptBlock -as [String] 141 | return $this.GetMinimallyObfuscated($ScriptString, $PSAmsiScanner, $AmsiSignatures) 142 | } 143 | 144 | [String] GetMinimallyObfuscated([ScriptBlock] $ScriptBlock, [Object] $PSAmsiScanner) { 145 | return $this.GetMinimallyObfuscated($ScriptBlock, $PSAmsiScanner) 146 | } 147 | 148 | [String] GetMinimallyObfuscated([ScriptBlock] $ScriptBlock) { 149 | return $this.GetMinimallyObfuscated($ScriptBlock, $null) 150 | } 151 | 152 | [String] GetMinimallyObfuscated([IO.FileInfo] $ScriptPath, [Object] $PSAmsiScanner, [Object[]] $AmsiSignatures) { 153 | $ScriptString = Get-Content $ScriptPath -Raw 154 | return $this.GetMinimallyObfuscated($ScriptString, $PSAmsiScanner, $AmsiSignatures) 155 | } 156 | 157 | [String] GetMinimallyObfuscated([IO.FileInfo] $ScriptPath, [Object] $PSAmsiScanner) { 158 | return $this.GetMinimallyObfuscated($ScriptPath, $PSAmsiScanner) 159 | } 160 | 161 | [String] GetMinimallyObfuscated([IO.FileInfo] $ScriptPath) { 162 | return $this.GetMinimallyObfuscated($ScriptPath, $null) 163 | } 164 | 165 | [String] GetMinimallyObfuscated([Uri] $ScriptUri, [Object] $PSAmsiScanner, [Object[]] $AmsiSignatures) { 166 | $ScriptString = [Net.Webclient]::new().DownloadString($ScriptUri) 167 | return $this.GetMinimallyObfuscated($ScriptString, $PSAmsiScanner, $AmsiSignatures) 168 | } 169 | 170 | [String] GetMinimallyObfuscated([Uri] $ScriptUri, [Object] $PSAmsiScanner) { 171 | return $this.GetMinimallyObfuscated($ScriptUri, $PSAmsiScanner) 172 | } 173 | 174 | [String] GetMinimallyObfuscated([Uri] $ScriptUri) { 175 | $ScriptString = [Net.Webclient]::new().DownloadString($ScriptUri) 176 | return $this.GetMinimallyObfuscated($ScriptString, $null) 177 | } 178 | } 179 | 180 | function Get-MatchingPSTokens { 181 | <# 182 | 183 | .SYNOPSIS 184 | 185 | Gets the PSTokens from a script that contains a portion of an AMSI signature. 186 | 187 | Author: Ryan Cobb (@cobbr_io) 188 | License: GNU GPLv3 189 | Required Dependecies: none 190 | Optional Dependencies: none 191 | 192 | .DESCRIPTION 193 | 194 | Get-MatchingPSTokens gets the tokens from a script that contains a portion of an AMSI signature. 195 | 196 | .PARAMETER SearchString 197 | 198 | The string containing the script to search for the AMSI signature. 199 | 200 | .PARAMETER SignatureString 201 | 202 | The string containing the AMSI signature to search for in the SearchString. 203 | 204 | .PARAMETER PSTokens 205 | 206 | The PSTokens that make up the SearchString script. 207 | 208 | .OUTPUTS 209 | 210 | PSCustomObject 211 | 212 | .EXAMPLE 213 | 214 | $AmsiSignatures = Find-AmsiSignatures -ScriptString $ScriptString 215 | Get-MatchingPSTokens -SearchString $ScriptString -SignatureString $AmsiSignatures[0] -PSTokens (Get-PSTokens -ScriptString $ScriptString) 216 | 217 | .NOTES 218 | 219 | Get-MatchingPSTokens is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 220 | 221 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 222 | 223 | #> 224 | [CmdletBinding()] Param ( 225 | [String] $SearchString, 226 | [String] $SignatureString, 227 | [System.Management.Automation.PSToken[]] $PSTokens 228 | ) 229 | $MinIndex = $SearchString.IndexOf($SignatureString) 230 | 231 | While ($MinIndex -ne -1) { 232 | $MaxIndex = $MinIndex + $SignatureString.Length 233 | $MatchingTokens = $PSTokens | ? { 234 | $StartIndex = $_.Start 235 | $EndIndex = $_.Start + $_.Length 236 | If ($StartIndex -ge $MinIndex -AND $EndIndex -le $MaxIndex) { $True } 237 | ElseIf ($EndIndex -ge $MinIndex -AND $EndIndex -le $MaxIndex) { $True } 238 | ElseIf ($StartIndex -ge $MinIndex -AND $StartIndex -le $MaxIndex) { $True } 239 | ElseIf ($StartIndex -le $MinIndex -AND $EndIndex -ge $MaxIndex) { $True } 240 | } 241 | If ($MatchingTokens.Count -gt 1) { 242 | $Start = $MatchingTokens[0].Start 243 | $Length = $MatchingTokens[$MatchingTokens.Count-1].Start + $MatchingTokens[$MatchingTokens.Count-1].Length - $Start 244 | $MatchingString = $SearchString.Substring($Start, $Length) 245 | [PSCustomObject] @{ MatchingTokens = ($MatchingTokens | Sort-Object -Descending { $_.Start }); MatchingString = $MatchingString; StartIndex = $Start; Length = $Length} 246 | } ElseIf ($MatchingTokens.Count -eq 1) { 247 | [PSCustomObject] @{ MatchingTokens = $MatchingTokens; MatchingString = $SearchString.Substring($MatchingTokens.Start, $MatchingTokens.Length); StartIndex = $MatchingTokens.Start; Length = $MatchingTokens.Length } 248 | } 249 | $MinIndex = $SearchString.IndexOf($SignatureString, $MinIndex+1) 250 | } 251 | } 252 | 253 | function Out-ObfuscatedPSToken { 254 | <# 255 | .SYNOPSIS 256 | 257 | Obfuscates a single PSToken within a script. 258 | 259 | Author: Daniel Bohannon (@danielhbohannon) 260 | Modified By: Ryan Cobb (@cobbr_io) 261 | License: Apache License, Version 2.0 262 | Required Dependencies: none 263 | Optional Dependencies: Out-ObfuscatedStringTokenLevel1, Out-RandomCaseToken, Out-ObfuscatedWithTicks, 264 | Out-ObfuscatedMemberTokenLevel3, Out-ObfuscatedCommandArgumentTokenLevel3, 265 | Out-ObfuscatedCommandTokenLevel2, Out-ObfuscatedVariableTokenLevel1, Out-ObfuscatedTypeToken, 266 | Out-RemoveComments 267 | 268 | .DESCRIPTION 269 | 270 | Out-ObfuscatedPSToken obfuscates a specified token within a script and returns 271 | the resulting script. 272 | 273 | .PARAMETER ScriptString 274 | 275 | The ScriptString that contains the token to be obfuscated. 276 | 277 | .PARAMETER PSTokens 278 | 279 | The set of PSTokens that represents the given ScriptString. 280 | 281 | .PARAMETER Index 282 | 283 | The index of the specified token to be obfuscated within the PSTokens array. 284 | 285 | .OUTPUTS 286 | 287 | String 288 | 289 | .EXAMPLE 290 | 291 | Out-ObfuscatedPSToken -ScriptString "Write-Host example" -PSTokens $(Get-PSTokens "Write-Host example") -Index 2 292 | 293 | .NOTES 294 | 295 | Out-ObfuscatedPSToken is a modified version of the original Out-ObfuscatedTokenCommand function included in 296 | Invoke-Obfuscation. The original description of Out-ObfuscatedTokenCommand is as follows: 297 | Out-ObfuscatedTokenCommand orchestrates the tokenization and application of all token-based obfuscation functions to provided PowerShell script and places obfuscated tokens back into the provided PowerShell script to evade detection by simple IOCs and process execution monitoring relying solely on command-line arguments. If no $TokenTypeToObfuscate is defined then Out-ObfuscatedTokenCommand will automatically perform ALL token obfuscation functions in random order at the highest obfuscation level. 298 | This is a personal project developed by Daniel Bohannon while an employee at MANDIANT, A FireEye Company. 299 | 300 | .LINK 301 | 302 | http://www.danielbohannon.com 303 | 304 | #> 305 | param( 306 | [Parameter(Position = 0, Mandatory)] 307 | [ValidateNotNullOrEmpty()] 308 | [String] $ScriptString, 309 | 310 | [Parameter(Position = 1, Mandatory)] 311 | [ValidateNotNullOrEmpty()] 312 | [System.Management.Automation.PSToken[]] $PSTokens, 313 | 314 | [Parameter(Position = 2, Mandatory)] 315 | [ValidateRange(0, [Int]::MaxValue)] 316 | [Int] $Index, 317 | 318 | [Parameter(Position = 3)] 319 | [ValidateRange(1, 4)] 320 | [Int] $ObfuscationLevel = 1 321 | 322 | ) 323 | $PSToken = $PSTokens[$Index] 324 | If (($PSToken.Type -eq 'String')) { 325 | # If String $Token immediately follows a period (and does not begin $ScriptString) then do not obfuscate as a String. 326 | # In this scenario $Token is originally a Member token that has quotes added to it. 327 | # E.g. both InvokeCommand and InvokeScript in $ExecutionContext.InvokeCommand.InvokeScript 328 | If (($PSToken.Start -gt 0) -AND ($ScriptString.SubString($PSToken.Start-1,1) -eq '.')) { 329 | Continue 330 | } 331 | 332 | # Set valid obfuscation levels for current token type. 333 | $ValidObfuscationLevels = @(1,2) 334 | 335 | # If invalid obfuscation level is passed to this function then default to highest obfuscation level available for current token type. 336 | If($ValidObfuscationLevels -NotContains $ObfuscationLevel) {$ObfuscationLevel = $ValidObfuscationLevels | Sort-Object -Descending | Select-Object -First 1} 337 | 338 | # The below Parameter Binding Validation Attributes cannot have their string values formatted with the -f format operator unless treated as a scriptblock. 339 | # When we find strings following these Parameter Binding Validation Attributes then if we are using a -f format operator we will treat the result as a scriptblock. 340 | # Source: https://technet.microsoft.com/en-us/library/hh847743.aspx 341 | $ParameterValidationAttributesToTreatStringAsScriptblock = @() 342 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'alias' 343 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'allownull' 344 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'allowemptystring' 345 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'allowemptycollection' 346 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'validatecount' 347 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'validatelength' 348 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'validatepattern' 349 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'validaterange' 350 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'validatescript' 351 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'validateset' 352 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'validatenotnull' 353 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'validatenotnullorempty' 354 | 355 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'helpmessage' 356 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'confirmimpact' 357 | $ParameterValidationAttributesToTreatStringAsScriptblock += 'outputtype' 358 | 359 | Switch ($ObfuscationLevel) { 360 | 1 {$ScriptString = Out-ObfuscatedStringTokenLevel1 $ScriptString $PSToken 1} 361 | 2 {$ScriptString = Out-ObfuscatedStringTokenLevel1 $ScriptString $PSToken 2} 362 | } 363 | 364 | } 365 | ElseIf ($PSToken.Type -eq 'Member') { 366 | # Set valid obfuscation levels for current token type. 367 | $ValidObfuscationLevels = @(1,2,3,4) 368 | 369 | # If invalid obfuscation level is passed to this function then default to highest obfuscation level available for current token type. 370 | If($ValidObfuscationLevels -NotContains $ObfuscationLevel) {$ObfuscationLevel = $ValidObfuscationLevels | Sort-Object -Descending | Select-Object -First 1} 371 | 372 | # The below Parameter Attributes cannot be obfuscated like other Member Tokens, so we will only randomize the case of these tokens. 373 | # Source 1: https://technet.microsoft.com/en-us/library/hh847743.aspx 374 | $MemberTokensToOnlyRandomCase = @() 375 | $MemberTokensToOnlyRandomCase += 'mandatory' 376 | $MemberTokensToOnlyRandomCase += 'position' 377 | $MemberTokensToOnlyRandomCase += 'parametersetname' 378 | $MemberTokensToOnlyRandomCase += 'valuefrompipeline' 379 | $MemberTokensToOnlyRandomCase += 'valuefrompipelinebypropertyname' 380 | $MemberTokensToOnlyRandomCase += 'valuefromremainingarguments' 381 | $MemberTokensToOnlyRandomCase += 'helpmessage' 382 | $MemberTokensToOnlyRandomCase += 'alias' 383 | # Source 2: https://technet.microsoft.com/en-us/library/hh847872.aspx 384 | $MemberTokensToOnlyRandomCase += 'confirmimpact' 385 | $MemberTokensToOnlyRandomCase += 'defaultparametersetname' 386 | $MemberTokensToOnlyRandomCase += 'helpuri' 387 | $MemberTokensToOnlyRandomCase += 'supportspaging' 388 | $MemberTokensToOnlyRandomCase += 'supportsshouldprocess' 389 | $MemberTokensToOnlyRandomCase += 'positionalbinding' 390 | 391 | $MemberTokensToOnlyRandomCase += 'ignorecase' 392 | 393 | Switch ($ObfuscationLevel) { 394 | 1 {$ScriptString = Out-RandomCaseToken $ScriptString $PSToken} 395 | 2 {$ScriptString = Out-ObfuscatedWithTicks $ScriptString $PSToken} 396 | 3 {$ScriptString = Out-ObfuscatedMemberTokenLevel3 $ScriptString $PSTokens $Index 1} 397 | 4 {$ScriptString = Out-ObfuscatedMemberTokenLevel3 $ScriptString $PSTokens $Index 2} 398 | } 399 | } 400 | ElseIf ($PSToken.Type -eq 'CommandArgument') { 401 | # Set valid obfuscation levels for current token type. 402 | $ValidObfuscationLevels = @(1,2,3,4) 403 | 404 | # If invalid obfuscation level is passed to this function then default to highest obfuscation level available for current token type. 405 | If($ValidObfuscationLevels -NotContains $ObfuscationLevel) {$ObfuscationLevel = $ValidObfuscationLevels | Sort-Object -Descending | Select-Object -First 1} 406 | 407 | Switch($ObfuscationLevel) 408 | { 409 | 1 {$ScriptString = Out-RandomCaseToken $ScriptString $PSToken} 410 | 2 {$ScriptString = Out-ObfuscatedWithTicks $ScriptString $PSToken} 411 | 3 {$ScriptString = Out-ObfuscatedCommandArgumentTokenLevel3 $ScriptString $PSToken 1} 412 | 4 {$ScriptString = Out-ObfuscatedCommandArgumentTokenLevel3 $ScriptString $PSToken 2} 413 | } 414 | } 415 | ElseIf ($PSToken.Type -eq 'Command') { 416 | # Set valid obfuscation levels for current token type. 417 | $ValidObfuscationLevels = @(1,2,3) 418 | 419 | # If invalid obfuscation level is passed to this function then default to highest obfuscation level available for current token type. 420 | If($ValidObfuscationLevels -NotContains $ObfuscationLevel) {$ObfuscationLevel = $ValidObfuscationLevels | Sort-Object -Descending | Select-Object -First 1} 421 | 422 | # If a variable is encapsulated in curly braces (e.g. ${ExecutionContext}) then the string inside is treated as a Command token. 423 | # So we will force tick obfuscation (option 1) instead of splatting (option 2) as that would cause errors. 424 | If(($PSToken.Start -gt 1) -AND ($ScriptString.SubString($PSToken.Start-1,1) -eq '{') -AND ($ScriptString.SubString($PSToken.Start+$PSToken.Length,1) -eq '}')) { 425 | $ObfuscationLevel = 1 426 | } 427 | 428 | Switch($ObfuscationLevel) { 429 | 1 {$ScriptString = Out-ObfuscatedWithTicks $ScriptString $PSToken} 430 | 2 {$ScriptString = Out-ObfuscatedCommandTokenLevel2 $ScriptString $PSToken 1} 431 | 3 {$ScriptString = Out-ObfuscatedCommandTokenLevel2 $ScriptString $PSToken 2} 432 | } 433 | } 434 | ElseIf ($PSToken.Type -eq 'Variable') { 435 | $ScriptString = Out-ObfuscatedVariableTokenLevel1 $ScriptString $PSToken 436 | } 437 | ElseIf ($PSToken.Type -eq 'Type') { 438 | # Set valid obfuscation levels for current token type. 439 | $ValidObfuscationLevels = @(1,2) 440 | 441 | # If invalid obfuscation level is passed to this function then default to lowest obfuscation level available for current token type. 442 | If($ValidObfuscationLevels -NotContains $ObfuscationLevel) {$ObfuscationLevel = $ValidObfuscationLevels | Select-Object -First 1} 443 | 444 | # The below Type value substrings are part of Types that cannot be direct Type casted, so we will not perform direct Type casting on Types containing these values. 445 | $TypesThatCannotByDirectTypeCasted = @() 446 | $TypesThatCannotByDirectTypeCasted += 'directoryservices.accountmanagement.' 447 | $TypesThatCannotByDirectTypeCasted += 'windows.clipboard' 448 | 449 | Switch ($ObfuscationLevel) { 450 | 1 {$ScriptString = Out-ObfuscatedTypeToken $ScriptString $PSToken 1} 451 | 2 {$ScriptString = Out-ObfuscatedTypeToken $ScriptString $PSToken 2} 452 | } 453 | } 454 | ElseIf ($PSToken.Type -eq 'Comment') { 455 | $ScriptString = Out-RemoveComments $ScriptString $PSTokens[$Index] 456 | } 457 | 458 | $ScriptString 459 | } 460 | 461 | function New-PowerShellObfuscator { 462 | <# 463 | 464 | .SYNOPSIS 465 | 466 | Creates a [PowerShellObfuscator] object for obfuscating PowerShell scripts to pass AMSI scans. 467 | 468 | Author: Ryan Cobb (@cobbr_io) 469 | License: GNU GPLv3 470 | Required Dependecies: PowerShellObfuscator 471 | Optional Dependencies: none 472 | 473 | .DESCRIPTION 474 | 475 | New-PowerShellObfuscator creates a [PowerShellObfuscator] object for obfuscating PowerShell scripts to pass AMSI scans. 476 | 477 | .PARAMETER ObfuscationCache 478 | 479 | Specify an ObfuscationCache that is a Hastable correlating AMSI signatures to known successful obfuscated version that pass AMSI scans. 480 | 481 | .OUTPUTS 482 | 483 | PowerShellObfuscator 484 | 485 | .EXAMPLE 486 | 487 | $Obfuscator = New-PowerShellObfuscator 488 | 489 | .NOTES 490 | 491 | New-PowerShellObfuscator is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 492 | 493 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 494 | 495 | #> 496 | Param ( 497 | [Parameter(Position = 0)] 498 | [ValidateNotNull()] 499 | [HashTable] $ObfuscationCache = @{} 500 | ) 501 | [PowerShellObfuscator]::new($ObfuscationCache) 502 | } 503 | 504 | function Get-MinimallyObfuscated { 505 | <# 506 | .SYNOPSIS 507 | 508 | Gets a minimally obfuscated copy of a script that passes AMSI scans. 509 | 510 | Author: Ryan Cobb (@cobbr_io) 511 | License: GNU GPLv3 512 | Required Dependecies: PowerShellObfuscator, New-PowerShellObfuscator 513 | Optional Dependencies: none 514 | 515 | .DESCRIPTION 516 | 517 | Get-MinimallyObfuscated gets a minimally obfuscated copy of a script that passes AMSI scans. 518 | 519 | .PARAMETER ScriptString 520 | 521 | Specifies the string containing the original script to be minimally obfuscated. 522 | 523 | .PARAMETER ScriptBlock 524 | 525 | Specifies the ScriptBlock containing the original script to be minimally obfuscated. 526 | 527 | .PARAMETER ScriptPath 528 | 529 | Specifies the Path to the original script to be minimally obfuscated. 530 | 531 | .PARAMETER ScriptUri 532 | 533 | The URI of the original script to be minimally obfuscated. 534 | 535 | .PARAMETER AmsiSignatures 536 | 537 | Specify the AMSI signatures that need to be obfuscated. These 538 | strings will be found manually, if not provided. 539 | 540 | .PARAMETER PSAmsiScanner 541 | 542 | Specifies the PSAmsiScanner to use for AMSI scans. 543 | 544 | .PARAMETER Obfuscator 545 | 546 | Specifies the PowerShellObfuscator to use for obfuscation. 547 | 548 | .OUTPUTS 549 | 550 | String 551 | 552 | .EXAMPLE 553 | 554 | Get-MinimallyObfuscated -ScriptString "Write-Host example" 555 | 556 | .EXAMPLE 557 | 558 | Get-MinamallyObfuscated -ScriptBlock { Write-Host "example" } 559 | 560 | .EXAMPLE 561 | 562 | Get-MinimallyObfuscated -ScriptPath ./Write-Example.ps1 563 | 564 | .NOTES 565 | 566 | New-PowerShellObfuscator is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 567 | 568 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 569 | 570 | #> 571 | [CmdletBinding(DefaultParameterSetName = "ByString")] Param( 572 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 573 | [ValidateNotNullOrEmpty()] 574 | [String] $ScriptString, 575 | 576 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 577 | [ValidateNotNullOrEmpty()] 578 | [ScriptBlock] $ScriptBlock, 579 | 580 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 581 | [ValidateScript({Test-Path $_ -PathType leaf})] 582 | [Alias('PSPath')] 583 | [String] $ScriptPath, 584 | 585 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 586 | [ValidateScript({$_.Scheme -match 'http|https'})] 587 | [Uri] $ScriptUri, 588 | 589 | [Parameter(Position = 1)] 590 | [String[]] $AmsiSignatures, 591 | 592 | [Parameter(Position = 2)] 593 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 594 | [Object] $PSAmsiScanner, 595 | 596 | [Parameter(Position = 3)] 597 | [ValidateScript({$_.GetType().Name -eq 'PowerShellObfuscator'})] 598 | [Object] $Obfuscator 599 | ) 600 | Begin { 601 | If (-not $Obfuscator) { $Obfuscator = New-PowerShellObfuscator } 602 | } 603 | Process { 604 | If ($AmsiSignatures) { 605 | If ($ScriptString) { $Obfuscator.GetMinimallyObfuscated($ScriptString, $PSAmsiScanner, $AmsiSignatures) } 606 | ElseIf ($ScriptBlock) { $Obfuscator.GetMinimallyObfuscated($ScriptBlock, $PSAmsiScanner, $AmsiSignatures) } 607 | ElseIf ($ScriptPath) { $Obfuscator.GetMinimallyObfuscated($ScriptPath, $PSAmsiScanner, $AmsiSignatures) } 608 | ElseIf ($ScriptUri) { $Obfuscator.GetMinimallyObfuscated($ScriptUri, $PSAmsiScanner, $AmsiSignatures) } 609 | } 610 | Else { 611 | If ($ScriptString) { $Obfuscator.GetMinimallyObfuscated($ScriptString, $PSAmsiScanner) } 612 | ElseIf ($ScriptBlock) { $Obfuscator.GetMinimallyObfuscated($ScriptBlock, $PSAmsiScanner) } 613 | ElseIf ($ScriptPath) { $Obfuscator.GetMinimallyObfuscated($ScriptPath, $PSAmsiScanner) } 614 | ElseIf ($ScriptUri) { $Obfuscator.GetMinimallyObfuscated($ScriptUri, $PSAmsiScanner) } 615 | } 616 | } 617 | } -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /PSAmsi/Find-AmsiSignatures.ps1: -------------------------------------------------------------------------------- 1 | function Find-AmsiSignatures { 2 | <# 3 | 4 | .SYNOPSIS 5 | 6 | Finds the AMSI signatures within a script that are flagged as malware by AMSI. 7 | 8 | Author: Ryan Cobb (@cobbr_io) 9 | License: GNU GPLv3 10 | Required Dependecies: none 11 | Optional Dependencies: New-PSAmsiScanner, Find-AmsiAstSignatures, Find-AmsiPSTokenSignatures 12 | 13 | .DESCRIPTION 14 | 15 | Find-AmsiSignatures finds the AMSI signatures within a script that are flagged as malware 16 | by the current AMSI AntiMalware Provider. 17 | 18 | .PARAMETER AbstractSyntaxTree 19 | 20 | Specifies the root Ast of an AbstractSyntaxTree that represents the script to get AMSI 21 | signatures from. 22 | 23 | .PARAMETER PSTokens 24 | 25 | Specifies the PSTokens that represents the script to get AMSI signatures from. 26 | 27 | .PARAMETER ScriptString 28 | 29 | Specifies the string containing the script to get AMSI signatures from. 30 | 31 | .PARAMETER ScriptBlock 32 | 33 | Specifies the ScriptBlock containing the script to get AMSI signatures from. 34 | 35 | .PARAMETER ScriptPath 36 | 37 | Specifies the Path to the script to get AMSI signatures from. 38 | 39 | .PARAMETER ScriptUri 40 | 41 | Specifies the URI of the script to get AMSI signatures from. 42 | 43 | .PARAMETER PSAmsiScanner 44 | 45 | Specifies the PSAmsiScanner to use to scan for finding AMSI signatures. 46 | 47 | .OUTPUTS 48 | 49 | String[] 50 | 51 | .EXAMPLE 52 | 53 | Find-AmsiSignatures "Write-Host example" 54 | 55 | Find-AmsiSignatures $AST $PSTokens 56 | 57 | @('Write-Host example1', 'Write-Host example2', 'Write-Host example3') | Find-AmsiSignatures 58 | 59 | .NOTES 60 | 61 | Find-AmsiSignatures is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 62 | 63 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 64 | 65 | #> 66 | [CmdletBinding(DefaultParameterSetName = "ByString")] Param( 67 | [Parameter(ParameterSetName = "ByComponents", Position = 0, Mandatory)] 68 | [Alias('Ast')] 69 | [System.Management.Automation.Language.Ast] $AbstractSyntaxTree, 70 | 71 | [Parameter(ParameterSetName = "ByComponents", Position = 1, Mandatory)] 72 | [System.Management.Automation.PSToken[]] $PSTokens, 73 | 74 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, Mandatory)] 75 | [ValidateNotNullOrEmpty()] 76 | [String] $ScriptString, 77 | 78 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, Mandatory)] 79 | [ValidateNotNullOrEmpty()] 80 | [ScriptBlock] $ScriptBlock, 81 | 82 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 83 | [ValidateScript({Test-Path $_ -PathType leaf})] 84 | [Alias('PSPath')] 85 | [String] $ScriptPath, 86 | 87 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 88 | [ValidateScript({$_.Scheme -match 'http|https'})] 89 | [Uri] $ScriptUri, 90 | 91 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 92 | [System.Object] $PSAmsiScanner, 93 | 94 | [Switch] $Unique 95 | ) 96 | Begin { 97 | $CreatedPSAmsiScanner = $False 98 | If (-not $PSAmsiScanner) { 99 | $PSAmsiScanner = New-PSAmsiScanner 100 | $CreatedPSAmsiScanner = $True 101 | } 102 | } 103 | Process { 104 | If ($ScriptString) { 105 | $AmsiAstSignatures = Find-AmsiAstSignatures -ScriptString $ScriptString -PSAmsiScanner $PSAmsiScanner 106 | $AmsiPSTokenSignatures = Find-AmsiPSTokenSignatures -ScriptString $ScriptString -PSAmsiScanner $PSAmsiScanner -FilterPSTokenTypes 'Comment' 107 | } ElseIf ($ScriptBlock) { 108 | $AmsiAstSignatures = Find-AmsiAstSignatures -ScriptBlock $ScriptBlock -PSAmsiScanner $PSAmsiScanner 109 | $AmsiPSTokenSignatures = Find-AmsiPSTokenSignatures -ScriptBlock $ScriptBlock -PSAmsiScanner $PSAmsiScanner -FilterPSTokenTypes 'Comment' 110 | } ElseIf ($ScriptPath) { 111 | $AmsiAstSignatures = Find-AmsiAstSignatures -ScriptPath $ScriptPath -PSAmsiScanner $PSAmsiScanner 112 | $AmsiPSTokenSignatures = Find-AmsiPSTokenSignatures -ScriptPath $ScriptPath -PSAmsiScanner $PSAmsiScanner -FilterPSTokenTypes 'Comment' 113 | } ElseIf ($ScriptUri) { 114 | $AmsiAstSignatures = Find-AmsiAstSignatures -ScriptUri $ScriptUri -PSAmsiScanner $PSAmsiScanner 115 | $AmsiPSTokenSignatures = Find-AmsiPSTokenSignatures -ScriptUri $ScriptUri -PSAmsiScanner $PSAmsiScanner -FilterPSTokenTypes 'Comment' 116 | } ElseIf ($AbstractSyntaxTree -and $PSTokens) { 117 | $AmsiAstSignatures = Find-AmsiAstSignatures -AbstractSyntaxTree $AbstractSyntaxTree -PSAmsiScanner $PSAmsiScanner 118 | $AmsiPSTokenSignatures = Find-AmsiPSTokenSignatures -PSTokens $PSTokens -PSAmsiScanner $PSAmsiScanner -FilterPSTokenTypes 'Comment' 119 | } 120 | # Create AmsiSignature objects 121 | $AmsiAstSignatures = ($AmsiAstSignatures | % { [PSCustomObject] @{ StartOffset = $_.Extent.StartOffset; SignatureType = $_.GetType().Name; SignatureContent = $_.Extent.Text } }) -as [array] 122 | $AmsiPSTokenSignatures = ($AmsiPSTokenSignatures | % { [PSCustomObject] @{ StartOffset = $_.Start; SignatureType = $_.GetType().Name; SignatureContent = $_.Content; } }) -as [array] 123 | $AmsiSignatures = $AmsiAstSignatures + $AmsiPSTokenSignatures 124 | 125 | If ($Unique) { $AmsiSignatures | Sort-Object -Unique { $_.SignatureContent } } 126 | Else { $AmsiSignatures } 127 | } 128 | End { 129 | If ($CreatedPSAmsiScanner) { $PSAmsiScanner.Dispose() } 130 | } 131 | } 132 | 133 | function Test-ContainsAmsiSignatures { 134 | <# 135 | 136 | .SYNOPSIS 137 | 138 | Tests if any AMSI signatures are contained in a given script. 139 | 140 | Author: Ryan Cobb (@cobbr_io) 141 | License: GNU GPLv3 142 | Required Dependecies: Test-ContainsAmsiAstSignatures, Test-ContainsAmsiPSTokenSignatures 143 | Optional Dependencies: New-PSAmsiScanner 144 | 145 | .DESCRIPTION 146 | 147 | Test-ContainsAmsiSignatures tests if any AMSI signatures are contained in a given script. This function 148 | is much quicker than a full Find-AmsiSignatures search. 149 | 150 | .PARAMETER AbstractSyntaxTree 151 | 152 | Specifies the root Ast of an AbstractSyntaxTree that represents the script to get AMSI 153 | signatures from. 154 | 155 | .PARAMETER PSTokens 156 | 157 | Specifies the PSTokens that represents the script to get AMSI signatures from. 158 | 159 | .PARAMETER ScriptString 160 | 161 | Specifies the string containing the script to get AMSI signatures from. 162 | 163 | .PARAMETER ScriptBlock 164 | 165 | Specifies the ScriptBlock containing the script to get AMSI signatures from. 166 | 167 | .PARAMETER ScriptPath 168 | 169 | Specifies the Path to the script to get AMSI signatures from. 170 | 171 | .PARAMETER ScriptUri 172 | 173 | Specifies the URI of the script to get AMSI signatures from. 174 | 175 | .PARAMETER PSAmsiScanner 176 | 177 | Specifies the PSAmsiScanner to use to scan for finding AMSI signatures. 178 | 179 | .OUTPUTS 180 | 181 | String[] 182 | 183 | .EXAMPLE 184 | 185 | Test-ContainsAmsiSignatures "Write-Host example" 186 | 187 | Test-ContainsAmsiSignatures $AST $PSTokens 188 | 189 | @('Write-Host example1', 'Write-Host example2', 'Write-Host example3') | Test-ContainsAmsiSignatures 190 | 191 | .NOTES 192 | 193 | Test-ContainsAmsiSignatures is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 194 | 195 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 196 | 197 | #> 198 | [CmdletBinding(DefaultParameterSetName = "ByString")] Param( 199 | [Parameter(ParameterSetName = "ByComponents", Position = 0, Mandatory)] 200 | [Alias('Ast')] 201 | [System.Management.Automation.Language.Ast] $AbstractSyntaxTree, 202 | 203 | [Parameter(ParameterSetName = "ByComponents", Position = 1, Mandatory)] 204 | [System.Management.Automation.PSToken[]] $PSTokens, 205 | 206 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, Mandatory)] 207 | [ValidateNotNullOrEmpty()] 208 | [String] $ScriptString, 209 | 210 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, Mandatory)] 211 | [ValidateNotNullOrEmpty()] 212 | [ScriptBlock] $ScriptBlock, 213 | 214 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 215 | [ValidateScript({Test-Path $_ -PathType leaf})] 216 | [Alias('PSPath')] 217 | [String] $ScriptPath, 218 | 219 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 220 | [ValidateScript({$_.Scheme -match 'http|https'})] 221 | [Uri] $ScriptUri, 222 | 223 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 224 | [System.Object] $PSAmsiScanner 225 | ) 226 | Begin { 227 | $CreatedPSAmsiScanner = $False 228 | If (-not $PSAmsiScanner) { 229 | $PSAmsiScanner = New-PSAmsiScanner 230 | $CreatedPSAmsiScanner = $True 231 | } 232 | } 233 | Process { 234 | If ($ScriptBlock) { $ScriptString = $ScriptBlock -as [String] } 235 | ElseIf ($ScriptPath) { $ScriptString = Get-Content -Path $ScriptPath -Raw } 236 | ElseIf ($ScriptUri) { $ScriptString = [Net.Webclient]::new().DownloadString($ScriptUri) } 237 | 238 | $ContainsAstSignatures = Test-ContainsAmsiAstSignatures -ScriptString $ScriptString -PSAmsiScanner $PSAmsiScanner 239 | If ($ContainsAstSignatures) { $True } 240 | Else { 241 | $ContainsPSTokenSignatures = Test-ContainsAmsiPSTokenSignatures -ScriptString $ScriptString -PSAmsiScanner $PSAmsiScanner -FilterPSTokenTypes 'Comment' 242 | If ($ContainsPSTokenSignatures) { $True } 243 | Else { $False } 244 | } 245 | } 246 | End { 247 | If ($CreatedPSAmsiScanner) { 248 | $PSAmsiScanner.Dispose() 249 | } 250 | } 251 | } 252 | 253 | function Find-AmsiAstSignatures { 254 | <# 255 | 256 | .SYNOPSIS 257 | 258 | Finds the Asts that contain AMSI signatures within an AbstractSyntaxTree. 259 | 260 | Author: Ryan Cobb (@cobbr_io) 261 | License: GNU GPLv3 262 | Required Dependecies: none 263 | Optional Dependencies: New-PSAmsiScanner, Get-Ast 264 | 265 | .DESCRIPTION 266 | 267 | Find-AmsiAstSignatures finds the Asts that contain AMSI signatures within an AbstactSyntaxTree. 268 | 269 | .PARAMETER AbstractSyntaxTree 270 | 271 | Specifies the root Ast that represents the script to find Asts that contain AMSI signatures. 272 | 273 | .PARAMETER ScriptString 274 | 275 | Specifies the string containing the script to find Asts that contain AMSI signatures. 276 | 277 | .PARAMETER ScriptBlock 278 | 279 | Specifies the ScriptBlock containing the script to find Asts that contain AMSI signatures. 280 | 281 | .PARAMETER ScriptPath 282 | 283 | Specifies the Path containing the script to find Asts that contain AMSI signatures. 284 | 285 | .PARAMETER ScriptUri 286 | 287 | Specifies the Uri of the script to find Asts that contain AMSI signatures. 288 | 289 | .PARAMETER PSAmsiScanner 290 | 291 | Specifies the PSAmsiScanner to use to scan to find Asts that contain AMSI signatures. 292 | 293 | .OUTPUTS 294 | 295 | System.Management.Automation.Language.Ast[] 296 | 297 | .EXAMPLE 298 | 299 | Find-AmsiAstSignatures -Ast $AbstractSyntaxTree 300 | 301 | .EXAMPLE 302 | 303 | Find-AmsiAstSignatures "Write-Host example" 304 | 305 | .EXAMPLE 306 | 307 | Find-AmsiAstSignatures { Write-Host example } 308 | 309 | .EXAMPLE 310 | 311 | Find-AmsiAstSignatures -ScriptPath $ScriptPath 312 | 313 | .EXAMPLE 314 | 315 | @($Ast1, $Ast2, $Ast3) | Find-AmsiAstSignatures 316 | 317 | .EXAMPLE 318 | 319 | Get-ChildItem /path/to/scripts -Recurse -Include *.ps1 | Find-AmsiAstSignatures 320 | 321 | .EXAMPLE 322 | 323 | @('Write-Host example1', 'Write-Host example2', 'Write-Host example3') | Find-AmsiAstSignatures 324 | 325 | .EXAMPLE 326 | 327 | @({ Write-Host example1 }, { Write-Host example2 }, { Write-Host example3 }) | Find-AmsiAstSignatures 328 | 329 | .NOTES 330 | 331 | Find-AmsiAstSignatures is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 332 | 333 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 334 | 335 | #> 336 | [CmdletBinding(DefaultParameterSetName="ByString")] Param( 337 | [Parameter(ParameterSetName="ByAst", Position = 0, ValueFromPipeline, Mandatory)] 338 | [ValidateNotNullOrEmpty()] 339 | [Alias('Ast')] 340 | [System.Management.Automation.Language.Ast] $AbstractSyntaxTree, 341 | 342 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, Mandatory)] 343 | [ValidateNotNullOrEmpty()] 344 | [String] $ScriptString, 345 | 346 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, Mandatory)] 347 | [ValidateNotNullOrEmpty()] 348 | [ScriptBlock] $ScriptBlock, 349 | 350 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 351 | [ValidateScript({Test-Path $_ -PathType leaf})] 352 | [Alias('PSPath')] 353 | [String] $ScriptPath, 354 | 355 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 356 | [ValidateScript({$_.Scheme -match 'http|https'})] 357 | [Uri] $ScriptUri, 358 | 359 | [Parameter(Position = 1)] 360 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 361 | [System.Object] $PSAmsiScanner 362 | ) 363 | Begin { 364 | $CreatedPSAmsiScanner = $False 365 | If (-not $PSAmsiScanner) { 366 | $PSAmsiScanner = New-PSAmsiScanner 367 | $CreatedPSAmsiScanner = $True 368 | } 369 | } 370 | 371 | Process { 372 | # Get the Ast object, if given a different ParameterSetName 373 | If ($ScriptString) { $AbstractSyntaxTree = Get-Ast -ScriptString $ScriptString } 374 | ElseIf ($ScriptBlock) { $AbstractSyntaxTree = Get-Ast -ScriptBlock $ScriptBlock } 375 | ElseIf ($ScriptPath) { $AbstractSyntaxTree = Get-Ast -ScriptPath $ScriptPath } 376 | ElseIf ($ScriptUri) { $AbstractSyntaxTree = Get-Ast -ScriptUri $ScriptUri } 377 | 378 | $AmsiAstSignatures = $AbstractSyntaxTree.FindAll( 379 | { 380 | param($ast) ( 381 | # This Ast has text 382 | ($ast.Extent.Text) -and 383 | # And it is flagged by AMSI 384 | ($PSAmsiScanner.GetPSAmsiScanResult($ast.Extent.Text)) 385 | ) 386 | }, $True) | Sort-Object { $_.Extent.Text.Length } 387 | # Need to find 'leaves' of detected tree to get the real signatures 388 | $NonDuplicates = @() 389 | ForEach ($AmsiAstSignature in $AmsiAstSignatures) { 390 | $Duplicate = $False 391 | ForEach ($NonDuplicate in $NonDuplicates) { 392 | If ($AmsiAstSignature.Extent.Text.Contains($NonDuplicate.Extent.Text)) { 393 | If (-not ($AmsiAstSignature.Extent.Text.Length -eq $NonDuplicate.Extent.Text.Length -AND $AmsiAstSignature.Extent.StartOffset -ne $NonDuplicate.Extent.StartOffset)) { 394 | $Duplicate = $True 395 | } 396 | break 397 | } 398 | } 399 | If (-not $Duplicate) { 400 | $NonDuplicates += $AmsiAstSignature 401 | } 402 | } 403 | $NonDuplicates -as [array] 404 | } 405 | End { 406 | If ($CreatedPSAmsiScanner) { $PSAmsiScanner.Dispose() } 407 | } 408 | } 409 | 410 | function Test-ContainsAmsiAstSignatures { 411 | <# 412 | 413 | .SYNOPSIS 414 | 415 | Tests if any Ast AMSI signatures are contained within an AbstractSyntaxTree. 416 | 417 | Author: Ryan Cobb (@cobbr_io) 418 | License: GNU GPLv3 419 | Required Dependecies: none 420 | Optional Dependencies: New-PSAmsiScanner, Get-Ast 421 | 422 | .DESCRIPTION 423 | 424 | Test-ContainsAmsiAstSignatures tests if any Ast AMSI signatures are contained within an AbstractSyntaxTree. 425 | This function is much quicker than a full Find-AmsiAstSignatures search. 426 | 427 | .PARAMETER AbstractSyntaxTree 428 | 429 | Specifies the root Ast that represents the script to find Asts that contain AMSI signatures. 430 | 431 | .PARAMETER ScriptString 432 | 433 | Specifies the string containing the script to find Asts that contain AMSI signatures. 434 | 435 | .PARAMETER ScriptBlock 436 | 437 | Specifies the ScriptBlock containing the script to find Asts that contain AMSI signatures. 438 | 439 | .PARAMETER ScriptPath 440 | 441 | Specifies the Path containing the script to find Asts that contain AMSI signatures. 442 | 443 | .PARAMETER ScriptUri 444 | 445 | Specifies the Uri of the script to find Asts that contain AMSI signatures. 446 | 447 | .PARAMETER PSAmsiScanner 448 | 449 | Specifies the PSAmsiScanner to use to scan to find Asts that contain AMSI signatures. 450 | 451 | .OUTPUTS 452 | 453 | System.Management.Automation.Language.Ast[] 454 | 455 | .EXAMPLE 456 | 457 | Test-ContainsAmsiAstSignatures -Ast $AbstractSyntaxTree 458 | 459 | .EXAMPLE 460 | 461 | Test-ContainsAmsiAstSignatures "Write-Host example" 462 | 463 | .EXAMPLE 464 | 465 | Test-ContainsAmsiAstSignatures { Write-Host example } 466 | 467 | .EXAMPLE 468 | 469 | Test-ContainsAmsiAstSignatures -ScriptPath $ScriptPath 470 | 471 | .EXAMPLE 472 | 473 | @($Ast1, $Ast2, $Ast3) | Test-ContainsAmsiAstSignatures 474 | 475 | .EXAMPLE 476 | 477 | Get-ChildItem /path/to/scripts -Recurse -Include *.ps1 | Test-ContainsAmsiAstSignatures 478 | 479 | .EXAMPLE 480 | 481 | @('Write-Host example1', 'Write-Host example2', 'Write-Host example3') | Test-ContainsAmsiAstSignatures 482 | 483 | .EXAMPLE 484 | 485 | @({ Write-Host example1 }, { Write-Host example2 }, { Write-Host example3 }) | Test-ContainsAmsiAstSignatures 486 | 487 | .NOTES 488 | 489 | Test-ContainsAmsiAstSignatures is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 490 | 491 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 492 | 493 | #> 494 | [CmdletBinding(DefaultParameterSetName="ByString")] Param( 495 | [Parameter(ParameterSetName="ByAst", Position = 0, ValueFromPipeline, Mandatory)] 496 | [ValidateNotNullOrEmpty()] 497 | [Alias('Ast')] 498 | [System.Management.Automation.Language.Ast] $AbstractSyntaxTree, 499 | 500 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, Mandatory)] 501 | [ValidateNotNullOrEmpty()] 502 | [String] $ScriptString, 503 | 504 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, Mandatory)] 505 | [ValidateNotNullOrEmpty()] 506 | [ScriptBlock] $ScriptBlock, 507 | 508 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 509 | [ValidateScript({Test-Path $_ -PathType leaf})] 510 | [Alias('PSPath')] 511 | [String] $ScriptPath, 512 | 513 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 514 | [ValidateScript({$_.Scheme -match 'http|https'})] 515 | [Uri] $ScriptUri, 516 | 517 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 518 | [System.Object] $PSAmsiScanner 519 | ) 520 | Begin { 521 | $CreatedPSAmsiScanner = $False 522 | If (-not $PSAmsiScanner) { 523 | $PSAmsiScanner = New-PSAmsiScanner 524 | $CreatedPSAmsiScanner = $True 525 | } 526 | } 527 | 528 | Process { 529 | # Get the Ast object, if given a different ParameterSetName 530 | If ($ScriptString) { $AbstractSyntaxTree = Get-Ast -ScriptString $ScriptString } 531 | ElseIf ($ScriptBlock) { $AbstractSyntaxTree = Get-Ast -ScriptBlock $ScriptBlock } 532 | ElseIf ($ScriptPath) { $AbstractSyntaxTree = Get-Ast -ScriptPath $ScriptPath } 533 | ElseIf ($ScriptUri) { $AbstractSyntaxTree = Get-Ast -ScriptUri $ScriptUri } 534 | 535 | # Use the Find function to find first matching ScriptBlockAst flagged by AMSI 536 | $FirstFlagged = $AbstractSyntaxTree.Find( 537 | { 538 | param($ast) ( 539 | $ast -is [System.Management.Automation.Language.ScriptBlockAst] -AND 540 | # This Ast has text 541 | ($ast.Extent.Text) -AND 542 | # And it is flagged by AMSI 543 | ($PSAmsiScanner.GetPSAmsiScanResult($ast.Extent.Text)) 544 | ) 545 | }, $True) 546 | If ($FirstFlagged) { $True } 547 | Else { $False } 548 | } 549 | End { 550 | If ($CreatedPSAmsiScanner) { $PSAmsiScanner.Dispose() } 551 | } 552 | } 553 | 554 | function Find-AmsiPSTokenSignatures { 555 | <# 556 | .SYNOPSIS 557 | 558 | Finds the PSTokens within a script that contain AMSI signatures that are flagged by AMSI. 559 | 560 | Author: Ryan Cobb (@cobbr_io) 561 | License: GNU GPLv3 562 | Required Dependecies: none 563 | Optional Dependencies: New-PSAmsiScanner, Get-PSTokens 564 | 565 | .DESCRIPTION 566 | 567 | Find-AmsiPSTokenSignatures finds the PSTokens within a script that contain AMSI signatures. 568 | 569 | .PARAMETER PSTokens 570 | 571 | Specifies the list of PSTokens that represent the script to find PSTokens from that contain AMSI signatures. 572 | 573 | .PARAMETER ScriptString 574 | 575 | Specifies the string containing the script to find PSTokens from that contain AMSI signatures. 576 | 577 | .PARAMETER ScriptBlock 578 | 579 | Specifies the ScriptBlock containing the script to find PSTokens from that contain AMSI signatures. 580 | 581 | .PARAMETER ScriptPath 582 | 583 | Specifies the Path containing the script to find PSTokens from that contain AMSI signatures. 584 | 585 | .PARAMETER ScriptUri 586 | 587 | Specifies the URI of the script to find PSTokens from that contain AMSI signatures. 588 | 589 | .PARAMETER PSAmsiScanner 590 | 591 | Specifies the PSAmsiScanner to use to find PSTokens that contain AMSI signatures. 592 | 593 | .PARAMETER FilterPSTokenTypes 594 | 595 | Specifies to only get PSTokens that have a PSTokenType in the provided list. 596 | 597 | .OUTPUTS 598 | 599 | System.Management.Automation.PSToken[] 600 | 601 | .EXAMPLE 602 | 603 | Find-AmsiPSTokenSignatures -PSTokens $PSTokens -FilterTokenTypes @('Comment', 'String') 604 | 605 | .EXAMPLE 606 | 607 | Find-AmsiPSTokenSignatures "Write-Host example" 608 | 609 | .EXAMPLE 610 | 611 | Find-AmsiPSTokenSignatures { Write-Host example } 612 | 613 | .EXAMPLE 614 | 615 | Find-AmsiPSTokenSignatures -ScriptPath $ScriptPath -FilterPSTokenTypes Comment 616 | 617 | .EXAMPLE 618 | 619 | @($PSTokens1, $PSTokens2, $PSTokens3) | Find-AmsiPSTokenSignatures 620 | 621 | .EXAMPLE 622 | 623 | Get-ChildItem /path/to/scripts -Recurse -Include *.ps1 | Find-AmsiPSTokenSignatures 624 | 625 | .EXAMPLE 626 | 627 | @('Write-Host example1', 'Write-Host example2', 'Write-Host example3') | Find-AmsiPSTokenSignatures 628 | 629 | .EXAMPLE 630 | 631 | @({ Write-Host example1 }, { Write-Host example2 }, { Write-Host example3 }) | Find-AmsiPSTokenSignatures 632 | 633 | .NOTES 634 | 635 | Find-AmsiPSTokenSignatures is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 636 | 637 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 638 | 639 | #> 640 | 641 | [CmdletBinding(DefaultParameterSetName="ByString")] Param( 642 | [Parameter(ParameterSetName = "ByPSTokens", Position = 0, ValueFromPipeline, Mandatory)] 643 | [ValidateNotNullOrEmpty()] 644 | [System.Management.Automation.PSToken[]] $PSTokens, 645 | 646 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, Mandatory)] 647 | [ValidateNotNullOrEmpty()] 648 | [String] $ScriptString, 649 | 650 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, Mandatory)] 651 | [ValidateNotNullOrEmpty()] 652 | [ScriptBlock] $ScriptBlock, 653 | 654 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 655 | [ValidateScript({Test-Path $_ -PathType leaf})] 656 | [Alias('PSPath')] 657 | [String] $ScriptPath, 658 | 659 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 660 | [ValidateScript({$_.Scheme -match 'http|https'})] 661 | [Uri] $ScriptUri, 662 | 663 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 664 | [System.Object] $PSAmsiScanner, 665 | 666 | [ValidateNotNullOrEmpty()] 667 | [System.Management.Automation.PSTokenType[]] $FilterPSTokenTypes = @('String', 'Member', 'CommandArgument', 'Command', 'Variable', 'Type', 'Comment') 668 | ) 669 | Begin { 670 | $CreatedPSAmsiScanner = $False 671 | If (-not $PSAmsiScanner) { 672 | $PSAmsiScanner = New-PSAmsiScanner 673 | $CreatedPSAmsiScanner = $True 674 | } 675 | } 676 | Process { 677 | # Get the PSTokens that represent the script, if not provided 678 | If ($ScriptString) { $PSTokens = Get-PSTokens -ScriptString $ScriptString } 679 | ElseIf ($ScriptBlock) { $PSTokens = Get-PSTokens -ScriptBlock $ScriptBlock } 680 | ElseIf ($ScriptPath) { $PSTokens = Get-PSTokens -ScriptPath $ScriptPath } 681 | ElseIf ($ScriptUri) { $PSTokens = Get-PSTokens -ScriptUri $ScriptUri } 682 | 683 | # Filter given tokens by type, and check if PSToken content is flagged by AMSI 684 | $AmsiPSTokenSignatures = $PSTokens | ? { $_.Type -in $FilterPSTokenTypes } | ? { $PSAmsiScanner.GetPSAmsiScanResult($_.Content) } 685 | $AmsiPSTokenSignatures -as [array] 686 | } 687 | End { 688 | If ($CreatedPSAmsiScanner) { $PSAmsiScanner.Dispose() } 689 | } 690 | } 691 | 692 | function Test-ContainsAmsiPSTokenSignatures { 693 | <# 694 | .SYNOPSIS 695 | 696 | Tests if any PSTokens within a script contain AMSI signatures that are flagged by AMSI. 697 | 698 | Author: Ryan Cobb (@cobbr_io) 699 | License: GNU GPLv3 700 | Required Dependecies: none 701 | Optional Dependencies: New-PSAmsiScanner, Get-PSTokens 702 | 703 | .DESCRIPTION 704 | 705 | Test-ContainsAmsiPSTokenSignatures tests if any PSTokens within a script contain AMSI signatures that are flagged by AMSI. 706 | This function is much quicker than a full Find-AmsiPSTokenSignatures search. 707 | 708 | .PARAMETER PSTokens 709 | 710 | Specifies the list of PSTokens that represent the script to find PSTokens from that contain AMSI signatures. 711 | 712 | .PARAMETER ScriptString 713 | 714 | Specifies the string containing the script to find PSTokens from that contain AMSI signatures. 715 | 716 | .PARAMETER ScriptBlock 717 | 718 | Specifies the ScriptBlock containing the script to find PSTokens from that contain AMSI signatures. 719 | 720 | .PARAMETER ScriptPath 721 | 722 | Specifies the Path containing the script to find PSTokens from that contain AMSI signatures. 723 | 724 | .PARAMETER ScriptUri 725 | 726 | Specifies the URI of the script to find PSTokens from that contain AMSI signatures. 727 | 728 | .PARAMETER PSAmsiScanner 729 | 730 | Specifies the PSAmsiScanner to use to find PSTokens that contain AMSI signatures. 731 | 732 | .PARAMETER FilterPSTokenTypes 733 | 734 | Specifies to only get PSTokens that have a PSTokenType in the provided list. 735 | 736 | .OUTPUTS 737 | 738 | System.Management.Automation.PSToken[] 739 | 740 | .EXAMPLE 741 | 742 | Test-ContainsAmsiPSTokenSignatures -PSTokens $PSTokens -FilterTokenTypes @('Comment', 'String') 743 | 744 | .EXAMPLE 745 | 746 | Test-ContainsAmsiPSTokenSignatures "Write-Host example" 747 | 748 | .EXAMPLE 749 | 750 | Test-ContainsAmsiPSTokenSignatures { Write-Host example } 751 | 752 | .EXAMPLE 753 | 754 | Test-ContainsAmsiPSTokenSignatures -ScriptPath $ScriptPath -FilterPSTokenTypes Comment 755 | 756 | .EXAMPLE 757 | 758 | @($PSTokens1, $PSTokens2, $PSTokens3) | Test-ContainsAmsiPSTokenSignatures 759 | 760 | .EXAMPLE 761 | 762 | Get-ChildItem /path/to/scripts -Recurse -Include *.ps1 | Test-ContainsAmsiPSTokenSignatures 763 | 764 | .EXAMPLE 765 | 766 | @('Write-Host example1', 'Write-Host example2', 'Write-Host example3') | Test-ContainsAmsiPSTokenSignatures 767 | 768 | .EXAMPLE 769 | 770 | @({ Write-Host example1 }, { Write-Host example2 }, { Write-Host example3 }) | Test-ContainsAmsiPSTokenSignatures 771 | 772 | .NOTES 773 | 774 | Test-ContainsAmsiPSTokenSignatures is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 775 | 776 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 777 | 778 | #> 779 | 780 | [CmdletBinding(DefaultParameterSetName="ByString")] Param( 781 | [Parameter(ParameterSetName = "ByPSTokens", Position = 0, ValueFromPipeline, Mandatory)] 782 | [ValidateNotNullOrEmpty()] 783 | [System.Management.Automation.PSToken[]] $PSTokens, 784 | 785 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, Mandatory)] 786 | [ValidateNotNullOrEmpty()] 787 | [String] $ScriptString, 788 | 789 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, Mandatory)] 790 | [ValidateNotNullOrEmpty()] 791 | [ScriptBlock] $ScriptBlock, 792 | 793 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 794 | [ValidateScript({Test-Path $_ -PathType leaf})] 795 | [Alias('PSPath')] 796 | [String] $ScriptPath, 797 | 798 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 799 | [ValidateScript({$_.Scheme -match 'http|https'})] 800 | [Uri] $ScriptUri, 801 | 802 | [ValidateScript({$_.GetType().Name -eq 'PSAmsiScanner'})] 803 | [System.Object] $PSAmsiScanner, 804 | 805 | [ValidateNotNullOrEmpty()] 806 | [System.Management.Automation.PSTokenType[]] $FilterPSTokenTypes = @('String', 'Member', 'CommandArgument', 'Command', 'Variable', 'Type', 'Comment') 807 | ) 808 | Begin { 809 | $CreatedPSAmsiScanner = $False 810 | If (-not $PSAmsiScanner) { 811 | $PSAmsiScanner = New-PSAmsiScanner 812 | $CreatedPSAmsiScanner = $True 813 | } 814 | } 815 | Process { 816 | # Get the PSTokens that represent the script, if not provided 817 | If ($ScriptString) { $PSTokens = Get-PSTokens -ScriptString $ScriptString } 818 | ElseIf ($ScriptBlock) { $PSTokens = Get-PSTokens -ScriptBlock $ScriptBlock } 819 | ElseIf ($ScriptPath) { $PSTokens = Get-PSTokens -ScriptPath $ScriptPath } 820 | ElseIf ($ScriptUri) { $PSTokens = Get-PSTokens -ScriptUri $ScriptUri } 821 | 822 | # Filter given tokens by type, and check if Token content is flagged by AMSI 823 | $PSTokens | ? { $_.Type -in $FilterPSTokenTypes } | % { 824 | $Result = $PSAmsiScanner.GetPSAmsiScanResult($_.Content) 825 | If ($Result) { $True; break } 826 | } 827 | } 828 | End { 829 | If ($CreatedPSAmsiScanner) { $PSAmsiScanner.Dispose() } 830 | } 831 | } 832 | 833 | function Get-Ast { 834 | <# 835 | 836 | .SYNOPSIS 837 | 838 | Gets the root Ast for a given script. 839 | 840 | Author: Ryan Cobb (@cobbr_io) 841 | License: GNU GPLv3 842 | Required Dependecies: none 843 | Optional Dependencies: none 844 | 845 | .DESCRIPTION 846 | 847 | Get-Ast gets the AbstractSyntaxTree that represents a given script. 848 | 849 | .PARAMETER ScriptString 850 | 851 | Specifies the String containing a script to get the AbstractSyntaxTree of. 852 | 853 | .PARAMETER ScriptBlock 854 | 855 | Specifies the ScriptBlock containing a script to get the AbstractSyntaxTree of. 856 | 857 | .PARAMETER ScriptPath 858 | 859 | Specifies the Path to a file containing the script to get the AbstractSyntaxTree of. 860 | 861 | .PARAMETER ScriptUri 862 | 863 | Specifies the URI of the script to get the AbstractSyntaxTree of. 864 | 865 | .OUTPUTS 866 | 867 | System.Management.Automation.Language.Ast 868 | 869 | .EXAMPLE 870 | 871 | Get-Ast "Write-Host example" 872 | 873 | .EXAMPLE 874 | 875 | Get-Ast {Write-Host example} 876 | 877 | .EXAMPLE 878 | 879 | Get-Ast -ScriptPath Write-Example.ps1 880 | 881 | .EXAMPLE 882 | 883 | Get-ChildItem /path/to/scripts -Recurse -Include *.ps1 | Get-Ast 884 | 885 | .EXAMPLE 886 | 887 | @('Write-Host example1', 'Write-Host example2', 'Write-Host example3') | Get-Ast 888 | 889 | .EXAMPLE 890 | 891 | @({ Write-Host example1 }, { Write-Host example2 }, { Write-Host example3 }) | Get-Ast 892 | 893 | .NOTES 894 | 895 | Get-Ast is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 896 | 897 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 898 | 899 | #> 900 | [CmdletBinding(DefaultParameterSetName = "ByString")] Param( 901 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, Mandatory)] 902 | [ValidateNotNullOrEmpty()] 903 | [String] $ScriptString, 904 | 905 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, Mandatory)] 906 | [ValidateNotNullOrEmpty()] 907 | [ScriptBlock] $ScriptBlock, 908 | 909 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 910 | [ValidateScript({Test-Path $_ -PathType leaf})] 911 | [Alias('PSPath')] 912 | [String] $ScriptPath, 913 | 914 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 915 | [ValidateScript({$_.Scheme -match 'http|https'})] 916 | [Uri] $ScriptUri 917 | ) 918 | Process { 919 | If ($ScriptBlock) { $ScriptString = $ScriptBlock -as [String] } 920 | ElseIf ($ScriptPath) { $ScriptString = Get-Content -Path $ScriptPath -Raw } 921 | ElseIf ($ScriptUri) { $ScriptString = [Net.Webclient]::new().DownloadString($ScriptUri) } 922 | 923 | # Parse script and return root Ast 924 | [Management.Automation.Language.ParseError[]] $ParseErrors = @() 925 | $Ast = [Management.Automation.Language.Parser]::ParseInput($ScriptString, $null, [ref] $null, [ref] $ParseErrors) 926 | $Ast 927 | } 928 | } 929 | 930 | function Get-PSTokens { 931 | <# 932 | 933 | .SYNOPSIS 934 | 935 | Gets the PSTokens for a given script. 936 | 937 | Author: Ryan Cobb (@cobbr_io) 938 | License: GNU GPLv3 939 | Required Dependecies: none 940 | Optional Dependencies: none 941 | 942 | .DESCRIPTION 943 | 944 | Get-PSTokens gets the PSTokens that represent a given script. 945 | 946 | .PARAMETER ScriptString 947 | 948 | Specifies the String containing a script to get the PSTokens from. 949 | 950 | .PARAMETER ScriptBlock 951 | 952 | Specifies the ScriptBlock containing a script to get the PSTokens from. 953 | 954 | .PARAMETER ScriptPath 955 | 956 | Specifies the Path to a file containing the script to get the PSTokens from. 957 | 958 | .PARAMETER ScriptUri 959 | 960 | Specifies the URI of the script to get the PSTokens from. 961 | 962 | .OUTPUTS 963 | 964 | System.Management.Automation.PSToken[] 965 | 966 | .EXAMPLE 967 | 968 | Get-PSTokens "Write-Host example" 969 | 970 | .EXAMPLE 971 | 972 | Get-PSTokens {Write-Host example} 973 | 974 | .EXAMPLE 975 | 976 | Get-PSTokens -ScriptPath Write-Example.ps1 977 | 978 | .EXAMPLE 979 | 980 | Get-ChildItem /path/to/scripts -Recurse -Include *.ps1 | Get-PSTokens 981 | 982 | .EXAMPLE 983 | 984 | @('Write-Host example1', 'Write-Host example2', 'Write-Host example3') | Get-PSTokens 985 | 986 | .EXAMPLE 987 | 988 | @({ Write-Host example1 }, { Write-Host example2 }, { Write-Host example3 }) | Get-PSTokens 989 | 990 | .NOTES 991 | 992 | Get-PSTokens is a part of PSAmsi, a tool for auditing and defeating AMSI signatures. 993 | 994 | PSAmsi is located at https://github.com/cobbr/PSAmsi. Additional information can be found at https://cobbr.io. 995 | 996 | #> 997 | [CmdletBinding(DefaultParameterSetName = "ByString")] Param( 998 | [Parameter(ParameterSetName = "ByString", Position = 0, ValueFromPipeline, Mandatory)] 999 | [ValidateNotNullOrEmpty()] 1000 | [String] $ScriptString, 1001 | 1002 | [Parameter(ParameterSetName = "ByScriptBlock", Position = 0, ValueFromPipeline, Mandatory)] 1003 | [ValidateNotNullOrEmpty()] 1004 | [ScriptBlock] $ScriptBlock, 1005 | 1006 | [Parameter(ParameterSetName = "ByPath", Position = 0, ValueFromPipelineByPropertyName, Mandatory)] 1007 | [ValidateScript({Test-Path $_ -PathType leaf})] 1008 | [Alias('PSPath')] 1009 | [String] $ScriptPath, 1010 | 1011 | [Parameter(ParameterSetName = "ByUri", Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName, Mandatory)] 1012 | [ValidateScript({$_.Scheme -match 'http|https'})] 1013 | [Uri] $ScriptUri 1014 | ) 1015 | Process { 1016 | If ($ScriptBlock) { $ScriptString = $ScriptBlock -as [String] } 1017 | ElseIf ($ScriptPath) { $ScriptString = Get-Content -Path $ScriptPath -Raw } 1018 | ElseIf ($ScriptUri) { $ScriptString = [Net.Webclient]::new().DownloadString($ScriptUri) } 1019 | 1020 | # Tokenize script and return PSTokens 1021 | [Management.Automation.PSParseError[]] $PSParseErrors = @() 1022 | $PSTokens = [Management.Automation.PSParser]::Tokenize($ScriptString, [ref]$PSParseErrors) 1023 | $PSTokens 1024 | } 1025 | } --------------------------------------------------------------------------------