I was updating my A.V. a few days ago and then I got a strange idea, what if there where a trojan that acts as a tool such as PKzip but it is timed to converts important files into .ZIP then on a time or date it then it launches another attack rather than quickly going into DOS or other applications to attack or weaken a system. How effective could a attack like this be? If it would be effective how could you prevent it something that weakens a system by .ZIPing files before a attack useing payloaded worms and (ect.)