A third version of Downadup has been identified by Symantec, which says the new variant gives infected machines more powerful instructions to disable antivirus software and analysis tools, among other actions.W32.Downadup.C is a modular component for machines currently infected with Downadup. This variant of Downadup, also called Conficker, is not attempting to self-replicate and appears to behave more like a Trojan than a worm, says Vincent Weafer, vice president of Symantec Security Response.
http://www.networkworld.com/news/2009/030609-downadup-conficker-symantec-variant.html
http://www.pcworld.com/article/160872/.html
http://computerworld.com.au/article/279389/
http://pcworld.idg.com.au/article/279389/
Symantec Warns of Worm’s Return
A third version of Downadup has been identified by Symantec, which says the new variant gives infected machines more powerful instructions to disable antivirus software and analysis tools, among other actions.