Yes that is a virus most defentily it sounds like W32.Gnuman.Worm you can look that up at:

http://securityresponse.symantec.com...uman.worm.html

The only thing that concerns me is that the worm I have cited is smaller than what you have reported. W32.Gunman.Worm contains no payload it is a proof of concept virus. You should sumit the download sample that you ran to Semantic Anti Virus the exact address is as followes:

http://www.sarc.com/avcenter/submit.html

Why did I pick that company and not trend or some other company. it is the program that I run. I also suggest that you go out and buy semantic anti virus from a store.

- Charles