Posted 01/21/09 at 05:22:17 PM by Mark Edward Soper

Remember Microsoft's rare out-of-band security update from last October, MS08-067? Microsoft warned us then that Windows XP, Windows Server 2003, and Windows 2000 SP4 were especially vulnerable to being attacked. Windows Update probably took care of patching your home computer. However, companies and individuals that were slow to patch their fleets of PCs with KB958644 could find their computers now infected by a nasty worm called Conficker, Downadup or Kido.

How big a deal is Conficker/Downadup? According to F-Secure, the number of infected machines went from 2.4 million to 8.9 million in just four days as of last Friday.  Panda Security now estimates that as many as one in every 16 PCs may be infected. F-Secure wraps up its analysis by saying "The situation with Downadup is not getting better. It's getting worse." Panda compares the outbreak with the legendary Kournikova (2001) and Blaster (2003) outbreaks.

How does Conficker/Downandup spread, and what can you do about it? Join us after the jump to learn more.

Read More