What is a trojan horse?

A Trojan horse, or simply Trojan, is malware masquerading as legitimate software, named after the famous Trojan horse in which ancient Greek soldiers smuggled themselves into Troy. Trojans often act as a backdoor to give an attacker remote access to a user’s computer.

How does a trojan horse work?

Unlike viruses and worms, trojans generally do not spread themselves. Trojan’s are often spread through some sort of social engineering, such as phishing.

The purpose of a trojan can range from destroying the victim’s system to using their resources as part of a botnet, extorting money, and stealing data. Up-to-date antivirus software and vigilance on the part of the user are the best defenses against trojans.

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