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Worm attack

A computer worm contains malicious code that attacks host computers and spreads via a network. Network worms exploit security vulnerabilities in various applications. Due to the availability of the internet, they can spread worldwide within a few hours of their release.

Most worm attacks (Sasser, SqlSlammer) can be avoided by using default firewall security settings or blocking unprotected and unused ports. Also, your operating system must be updated with the most recent security patches.