Which software is giving you that detection name as it's not in McAfee naming format? If you're running McAfee software can you ensure it's updated and then run a full scan please, then report back with the results.
It is desplayed as Virtool:Win32/obfuscator.HG when detected.
McAfee knows it by a different name: http://home.mcafee.com/VirusInfo/VirusProfile.aspx?key=239603#none
It should be removable by McAfee as long as you are up to date.
If you are getting the detection in your "System Volume" then it may be trapped in your System Restore folder in which case turning off System Restore should remove it.
After a reboot you can re-enable System Restore.
This can be a New Variant,