What is a trojan horse?

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A trojan (or trojan horse) is a malicious computer program that is disguised as a harmless application or is secretly integrated into legitimate software. It usually carries a destructive payload. A trojan gets silently installed and hides from the user. These parasites are very similar to the regular viruses and therefore are quite difficult to detect and completely disable. Originally trojans were not intended to replicate by themselves. However, some recent threats have additional components, which enable their propagation. The trojan’s payload varies depending on its author’s intentions. It usually provides the attacker with unauthorized remote access to a compromised computer, infects files and damages the system, drops other dangerous parasites or steals user sensitive information.

according to: http://www.2-spyware.com/trojans-removal

Answer

The Trojan Horse was a giant wooden horse built to sneak the Greeks past the Trojan walls after a ten-year siege. After the Trojans celebrated and drank themselves into a deep sleep, thinking the horse was a gift from the gods, the Greeks snuck out of the horse and slaughtered nearly everyone in the city. There are many more details to the story, but I'm just trying to sum up. Today, the term, "Trojan Horse" may be used to describe anyone or anything that tries to bring down a system from within. I would give more information, but I don't know exactly how specific you wanted me to be.

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