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Viruses, Worms, and Trojan Horses

Viruses, Worms, and Trojan Horses are all malicious computer programs that threat your data security and integrity.

What are they and what are the differences between Viruses, Worms, and Trojan Horses?

  • Viruses -- A computer virus is a small program written to alter the way a computer operates, without the permission or knowledge of the user. It have to execute itself and replicate itself.A virus's duplicate requires the spreading of an infected host file.

  • Worm -- Worms are programs that replicate themselves from system to system without the use of a host file. First it takes control of features on the computer that can transport files or information. Once a worm is in your system, it can travel alone automatically.

  • Trojan horse -- Trojan horses are files that claim to be something desirable but, in fact, are malicious.  A very important distinction between Trojan horse programs and true viruses is that they do not replicate themselves. For a Trojan horse to spread, you must invite these programs onto your computers; for example, by opening an email attachment or downloading and running a file from the internet.

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