Is it not trivial to simply change the process name, one or two lines at most in code? I'm trying to think about the logistics of running something like this and unless the process name is something like ./sshbruteforce 293849 ..
0 - http://www.ranum.com/security/computer_security/papers/ai/
The world is much more familiar with UNIX in 2015; I trust that today no one would rely on /var/log.
My approach would be to look at periodic memory dumps and look for anomalies there.
And not to rely on the integrity of utilities stored the system that you are analyzing.