You might remember this virus from 2004. MyDoom became the largest mass-mailer outbreak to infect a large user base following the Sobig.F worm in September 2003. Although MyDoom.A was not the first worm to demonstrate how effectively virus and spamming attack methods could be combined, it arguably became the most successful when it reached a peak infection rate of 1 in every 12 e-mails.

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