A worm is a small independent program (often an email attachment) that moves over networks (LANs or the internet) from computer to computer. It's main purpose is to distribute copies of itself, usually by automatically sending emails containing the worm to other people. Worms themselves don't infect other programs, but they may contain trojan horse or viruses, which may do it.



How worms work:

What to do against them:

Don't click on unknown attachments. They may be worms.

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Erich Prisner, December 2004