[kotkis]

I'm pretty sure the cookies OP mentions have nothing to do with the trojans/viruses he found. Since he only found out about the cookies today I'd say there's a pretty good chance he hasn't performed a full system scan using these tools in a while. Thus I conclude it's very possible OP didn't get the virus from a .backup file but instead the malicious software has been on his computer for a while now and he only found out about them after performing a full system scan today.