Anti-virus does some basic heuristics and signature checking, and honestly, they are doing a pretty bad job at detecting virusses or overlooking them (Flame for example, or the recent Adobe CA compromise)<p>Mikko Hypponen from F-secure, a Finnish anti-virus company, only had the guts to admit it, you can read the article here; <a href="http://www.wired.com/threatlevel/2012/06/internet-security-fail/" rel="nofollow">http://www.wired.com/threatlevel/2012/06/internet-security-f...</a>
I doubt that. I say this because there are always people who want to do something crazy(like create a virus) just to exploit an OS/app or prove how good they are. Some create malware to infect pcs so they can add to their botnets which could be sold or used for themselves.. So these antivirus companies are just trying to help out.
No way. Imagine if they got caught. It'd kill their entire company. How is a little bit of marketing going to be worth that risk? It's almost like asking 'Why don't auto body shops remove stop signs in their area to get more business'?