Sophos shows a "Malware Alarm" as a "potentially unwanted application" and appears to say that it's anticrud program will remove it for you. I'm not familiar with Sophos programs so can't say which class of program they're suggesting.
Symantec also identifies it as a "serious threat."
The Symantec response references Symantec AntiSpywareShield, which possibly indicates that this is something not typically detected by antivirus programs. (You need "Internet Security" or "Norton 360" for this kind of stuff.)
The recommendation that you "visit the Symantec Security Response website" is vague (they've been taking lessons from Vista), since there ain't no such button on their header; but a search at Symantec gets me to Security Response Weblog where there's a button on the right to run the "Symantec Security Check" which might be helpful.