baggle again - stupid virus
a mailserver does not have to let pass binary attachments in a mail without you having explicitly demanded for it with good reason. You don't ride with a car with three wheels and no brakes either in the opposite direction.
just block these attachments, wherever you can (network, mailagents,...)
DO NOT OPEN MAIL YOU DID NOT EXPECt OR ASKED FOR.
and as with so many other bigger viruses the last months, they are using a network of hacked servers with more files on that infected computers shall download
copy them to your proxy server in your network and block them, period.