Hi all:

In recent weeks a worm, a malicious software program, 
has swept through corporate, educational and public 
computer networks around the world. Currently 2.5 million
PCs are affected worldwide.

Known as Conficker or Downadup, it is spread 
 . by a recently discovered Windows vulnerability,
 . by guessing network passwords and 
 . by USB

A quick overview can be read here
http://en.wikipedia.org/wiki/Conficker


thanks
Saifi.

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