What Is A Trojan Horse?

Trojan horses are malicious programs disguised as something benign. They’ve been known to pose as games, utilities, and email attachments. Once opened, Trojan horses act much differently than you expect. Some merely annoy, sending emails to everyone in your address book. Others do serious damage, to the point of stealing passwords and data files. Unlike viruses, Trojan horses are not self-replicating.

Active Trojan horses are an advanced type of Trojan horse. They use unprotected ports to open lines of communication with your computer, and they can ultimately give hackers control over your machine. Active Trojan horses are also called Remote Access Trojans.