The MyDoom worm. First seen in January 2004, it spread via email, opened a backdoor for spammers to gain access to your PC, and scoured your hard drive for more email addresses to forward itself onto.
It became widespread in no time, which was particularly concerning for software firm SCO – whose website it targeted with a distributed denial-of-service attack from infected Windows computers, seemingly as part of a civil war between different factions of the Linux community.
SCO offered a bounty of $250,000 for information leading to the successful arrest and conviction of the author.
As a later variant…
Read more in my article on the Naked Security website.
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