[BreShiE]

Thank bro, are rats viral? I mean copying themselves from computers to computers automatically (sorry for my english)

That sounds like a "worm" virus. The "work" Trojan virus is a piece of software which is capable of accessing your instant messengers/social networks and/or emails to spread itself with friendly and luring messages like "Hey, is this a picture of you naked? :O http://linktovirus.com/trojan.exe"