Viveros said there's a growing number of remote access Trojan programs sent via e-mail that can open the backdoor to a user's PC and gather log-ins and passwords to company intranets.

CNN: New 'Trojan Horse' strain may go mainstream

Flame, a backdoor Windows trojan, doesn't just sniff and steal nearby network traffic info -- it uses your computer's hardware against you.

ENGADGET: Flame malware snoops on PCs across the Middle East, makes Stuxnet look small-time