The attack echoes the MyDoom-O worm's use of the Google, Yahoo, Lycos and Altavista search engines last week, which resulted in millions of users being unable to search the web using Google.

The MyDoom-Q worm arrives as an email attachment, and will scour files on the infected user's hard drive for other email addresses to which to send itself. However, it will then use the People Search facility of the Yahoo website (people.yahoo.com) to try and find additional email addresses.

"Copycat viruses are all the rage in the cybercrime underworld, so you didn't have to be psychic to predict the release of more worms trying to scoop up email addresses from search engines. Unfortunately, we expect to see other worm authors trying similar tricks in the future," said Graham Cluley, senior technology consultant for Sophos. "All internet users should do their bit to ensure they are not passing on infected files by using up-to-date anti-virus software and exercising great caution when receiving unsolicited email attachments."
With the source code so public im surprised there hasn't been heaps more versions of MyDoom.......simply by typing "MyDoom-A Source code" at google gets it the 3rd on the list with a site containing the full source......i would've thought with that there'd be a hell of a lot more myDoom varients.