Computer Experts Unite to Hunt Conficker Worm

An extraordinary behind-the-scenes struggle is taking place between computer security groups around the world and the brazen author of a malicious software program called Conficker.The program grabbed global attention when it began spreading late last year and quickly infected millions of computers with software code that is intended to lash together the infected machines it controls into a powerful computer known as a botnet.
http://nytimes.com/2009/03/19/technology/19worm.html