What is it?
W32.Mydoom.Q@mm rasor38a.dll

What does it do?
W32.Mydoom.Q@mm is a mass-mailing worm that downloads an executable file and uses its own SMTP engine to send itself to the email addresses that it finds on the infected computer.

The downloaded file is detected as Backdoor.Nemog .

Creates a mutex named "43jfds93872", so that only one copy of the worm will run on the infected computer

Removal Instructions:
Full dirt @ Symantec