W32.Downadup.B Virus was discovered by Symantec last December 30, 2008, and was announce to public January 9, 2009. Now it widely spreading all over the world and it floodings network connections.
This virus monitors DNS requests to domains containing certain strings and blocks access to those domains so that it will appear that the network request timed out. We (my MIS Team) discovered W32.Downadup.B Virus from our quarantine logs and we found out that it was introduce to the network using a USB drive activated by autorun.inf.
W32.Downadup.B creates an autorun.inf file on all mapped drives so that the threat automatically executes when the drive is accessed. The threat then monitors for drives that are connected to the compromised computer in order to create an autorun.inf file as soon as the drive becomes accessible.
Read moreHow to Remove W32.Downadup.B Virus?