Oh - is it the midimapping.dll thing? We got warned about that but our servers look ok, at least. Norton's not touching it, apparently.
I haven't looked it up. I think it's a Gaobot (aka Agobot) variant, but the files are detected as being infected with "Morphine". It uses network shares to spread...which normally means it's all but impossible to spread, BUT we found out the hard way that if someone with administrative access to the network logs in to an infected machine...it likes it.
The newest version of McAfee zaps it. The older version, even with current definition files, doesn't.