Worm w32/vb.wf out in the wild.

Information and links on this wiki page.

https://social.technet.microsoft.com/wiki/contents/articles/worm-win32-vb-wf-forefront-and-antigen-mitigation.aspx

This is spreading quickly. I expect that most Antigen users are already filtering but if you have 2007 or 2010 there is some more information there.