Yes, it is a virus, in fact it is 2 viruses. One called mimail and one called sobig.e the attachment should be called message.zip
just delete it. DO NOT TRY TO UNZIP THE FILE.
If you need more info on how to get rid of it (if you have already unzipped it) go to click here and click on Virus Information and in the search box type mimail. Print it off and then do the same for sobig.
Yes it is going around. It is dated 01/08/2003 emanating from Russia. It harvests email addresses from your email address book.
Look in your C:\mydocuments folder and if you have a file in there called your.details.zip delete it. You will also need to search for files called videodrv.exe exe.tmp and zip.tmp and delete them as well. There are also two registry entries as well but if you go the mcafee link you can print it off.
Hopefully we are not stealing the thread. If we can get this virus off then it must be good. McAfee list two patches from Microsoft. 1. MS02-015 and 2. MS03-014. They are also listing something called "stinger" to include detection/removal of this threat. Go to the McAfee site on the above link and read it.