Psf (Process Stack Faker) attempts “hide” UN*X processes (those seen by “ps auwx” & “top”) without having root. Tested on FreeBSD 4.3, Linux 2.4, NetBSD 1.5, Solaris 2.7.
You can download it from the following link: https://packetstormsecurity.com/files/download/26108/psf.c
Source: https://packetstormsecurity.com/files/26108/psf.c.html