While the lines between viruses, worms, and Trojans get murkier every day, it´s easier to consider them if you think about their underlying purpose. Typically, viruses spread via email and have benign payloads. Worms spread by other channels – instant messaging, SNMP, RSS (not yet, but coming), and any number of Microsoft protocols. Worms usually have benign payloads as well. Their purpose is to spread as rapidly as possible.
While the original Trojan Horse was used to sneak Greeks into Troy, the common meaning today actually refers to the payload that gets deposited on your computer. Trojans typically grant a hacker remote access to your computer. From there, they use this open door to install whatever they choose. Several of these allow the hacker to open the CD tray on your computer or make it beep just for fun.Read Full Story