AutoHotkey Community

#include "stdafx.h"
#include <windows.h>
#define JMP(frm,to) (((int)to - (int)frm)-5)
DWORD Adress = 0x00553A83;
DWORD RetAdress = (Adress + 7); // cause 2 nops
__declspec(naked) void myCodeCave ()
{
  __asm
  {
cmp [eax+0x70], 0x5D4D475B          //[GM]
je [00000000]
mov [esi+0x0c],0x00000000
jmp [RetAdress]
  }
}

void GMDetect ()
{
   *(BYTE*)Adress = 0xe9; // defining jump opcode
   *(DWORD*)(Adress+1) = JMP(Adress,myCodeCave);
   *(WORD*) (Adress +5)= 0x9090;
}

void dllmain()
{
GMDetect();
return;
}