The 'Worm' That Could Bring Down the Internet
"For the past three years, a highly encrypted computer worm called Conficker has been spreading rapidly 
around the world. As many as 12 million computers have been infected with the self-updating worm, a type of malware that can get inside computers and operate without their permission."
"What Conficker does is penetrate the core of the [operating system] of the computer and essentially turn over control of your computer to a remote controller," writer Mark Bowden tells Fresh Air's Terry Gross. "[That person] could then utilize all of these computers, including yours, that are connected. ... And you have effectively the largest, most powerful computer in the world."