Turtle rootkit for FreeBSD. This kernel module hooks unlink() so the protected file cannot be deleted, hooks kill() so the protected process cannot be killed, and has various other nice bells and whistles.
You can download it from the following link: https://packetstormsecurity.com/files/download/94367/Turtle.tar.gz
Source: https://packetstormsecurity.com/files/94367/Turtle-FreeBSD-Rootkit.html