http://blogs.technet.com/mmpc/archive/2009/03/27/information-about-worm-win32-conficker-d.aspxOver the past several months, Microsoft has received reports on 4 different variants of the Conficker worm, the latest being Worm:Win32/Conficker.D (also known as Downadup.C, and the subject of a number of recent press articles labeling this variant asen-USCommunityServer 2.1 SP1 (Build: 61025.2)