Is "symantec is cleaning threats" message legit?

I had never seen this message before:

"Symantec is cleaning threats from your system.  Your system will be rebooted when this operation is complete"

I'm running Norton 360 Premier on Windows 7 desktop.  My system rebooted and came up fine but just want to make sure the message was legit and not some rogue program pretending to be Norton.

Thanks