G'day,
Unfortunately, VIRUT is obviously not in CAVS2 BETA's detection library yet. Here's a couple of links that should get you out of trouble.
INFORMATION AND WARNINGS
http://www.grisoft.com/ww.virbase?nam=Win32%2FVirutN.B. This page does mention that the affected files are not the same as the originals after they have been disinfected, due to the nature of the infection. This may cause issues and you should probably restore the original files after you have disinfected.
REMOVAL TOOL
http://www.grisoft.com/ww.virus-removal.ndi-67762The above info page and removal tools are provided by AVG.
Hope this works out for you.
Ewen :-)
P.S. I have PM'd the developers to this post for their info.