Under the Web

Some interesting things in life and internet

What is Trojan?

Posted by Jackie R. on December 7, 2006

The primary difference between virus and trojan is that trojans don’t spread on their own. Trojan is a malicious program that is disguised as legitimate software. The term is derived from the Greek classical myth of the siege of Troy. Trojan horse programs work in a similar way: they may look useful or interesting (or at the very least harmless) to an unsuspecting user, but are actually harmful when executed. A Trojan horse can be deliberately attached to otherwise useful software or it can be spread by tricking users into believing that it is a useful program.

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