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What is a ‘Trojan’ virus and what does it do? [Guide]

Perhaps you’ve heard of Helen of Troy, the most beautiful woman in the world, the cause of the Trojan War in ancient Greece.  If you’re familiar with the story, you probably know that the city of Troy put up a good fight until they were defeated by an enemy that had sneaked behind their defenses and ambushed them suddenly.  The attacking soldiers build a giant hollow horse statue and filled it with warriors.  They then presented it to Troy as a gift of peace. After the Trojans brought the horse into the city, the soldiers poured out of it at night and ransacked the city from the inside, opening the gates to allow their fellows inside the defenses.

Computer viruses [1] called “Trojans” do the same thing.  They sneak into your computer through some subtle method and destroy it from the inside out.  There are several types of Trojan viruses. Read on to learn more.

ALSO READ: 12 ways how to know if your computer has a virus [Guide] [1]


If you want to delete a Trojan virus you have to determine the type of Trojan first.  Here are some of the most common.

Trojan viruses have evolved into more and more advanced types that cannot be detected easily by many antivirus programs.


If your computer begins running slowly and you suspect a hidden Trojan file that your antivirus software has not found, there are some methods you can use to try to find the file.


Once you have detected some abnormal file or process on your computer, your next step is to remove it.  See one of our articles covering a variety of antivirus or cleaning software for instructions on how to remove the discovered Trojan file.