Tricky Windows Worm Wallops Millions

From the Washington Post Security Fix Blog : Tricky Windows Worm Wallops Millions

A sneaky computer worm that uses a virtual Swiss army knife of attack techniques has infected millions of Microsoft Windows PCs, and appears to be spreading at a fairly rapid pace, security experts warn.

The worm, called "Downadup" and "Conficker" by different anti-virus companies, attacks a security hole in a networking component found in most Windows systems. According to estimates from Finnish anti-virus maker F-Secure Corp., the worm has infected between 2.4 million and 8.9 million computers during the last four days alone.