Originally Posted By: JCLover
Don't know how to verify this with an official Apple source, but I offer it for your edification: OS X Has Built In Anti-Malware

I believe I have confirmed that OS X 10.6.8 has built in anti-virus software. I've discovered the top command. One of the processes is:
PID COMMAND %CPU TIME #TH #WQ #POR #MREG RPRVT RSHRD RSIZE VPRVT VSIZE PGRP PPID STATE UID FAULTS COW MSGSENT
60- AntiVirus 0.0 00:12.03 2 1 31 117 239M 6660K 250M 260M 865M 60 1 sleeping 0 721048 168 965

Sorry I couldn't figure out how to format this correctly.

From what I could discern, it's a process that has only used 12.03 seconds of CPU time in the 108 minutes since power up. I'll try to learn more.

MacBookPro5,4; 1 Intel Core 2 Duo, 2.53 GHz; 4 GB Memory; 15" Monitor; OS X 10.6.8

JCLover