Example of DLL code designed for protecting C2 payloads by disabling them after a predefined 'kill date', ensuring secure and time-controlled operations.

KillDateProtect.cpp

#include <windows.h>
#include <iostream>
#include <chrono>
#include <ctime>
#include <sstream>

// White Knight Labs - Offensive Development Course
// DLL Kill Date Example

bool parseDate(const std::string& dateStr, std::tm& date) {
    std::istringstream iss(dateStr);
    char delimiter;
    int day, month, year;

    if (iss >> day >> delimiter >> month >> delimiter >> year) {
        if (delimiter == '-' && year > 1900) {
            date.tm_year = year - 1900;
            date.tm_mon = month - 1;
            date.tm_mday = day;
            return true;
        }
    }
    return false;
}

bool isDateInThePast(const std::string& inputDate) {
    // Get the current date
    auto current_time = std::chrono::system_clock::now();
    std::time_t current_date = std::chrono::system_clock::to_time_t(current_time);

    // Parse the input date
    std::tm check_date = {};
    if (!parseDate(inputDate, check_date)) {
        std::cerr << "Invalid date format. Please use DD-MM-YYYY." << std::endl;
        return true; // Treating invalid date as past date
    }

    // Convert check_date to time_t for comparison
    std::time_t check_time = std::mktime(&check_date);

    // Compare the dates
    return std::difftime(check_time, current_date) < 0;
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved) {
    switch (fdwReason) {
        case DLL_PROCESS_ATTACH:
            // Check if a specific date is in the past
            if (isDateInThePast("01-01-2024")) {
                std::cout << "The date is in the past. DLL loading halted." << std::endl;
                return FALSE; // Prevents the DLL from loading
            }
            std::cout << "The date is not in the past. Continuing DLL loading." << std::endl;
			
			// ... [Rest of your code]
			
            break;

        case DLL_THREAD_ATTACH:
            // Code for thread attach
            break;

        case DLL_THREAD_DETACH:
            // Code for thread detach
            break;

        case DLL_PROCESS_DETACH:
            // Code for process detach
            break;
    }
    return TRUE; // Allow the DLL to load
}