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Mary's Antivirus Software Blog

By Mary Landesman, About.com Guide to Antivirus Software since 2000

What is a Trojan?

Thursday December 15, 2005
A Trojan is a program that may appear to be legitimate, but in fact does something malicious. Trojans are often used to gain backdoor access - that is to say remote, surreptitious access, to a user's system. Trojans do not replicate as viruses do, nor make copies of themselves as worms do. These are sometimes referred to as Remote Access Trojans, or RATs. >> More on Trojans

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