System infected Spygate RAT activity detected

Good evening,

Since 2 hours I'm getting this popup  "Symantec Endpoint Protection [SID27950] System Infected Spygate RAT Activity detected".

I have looked on different forums but I can't find a solution.

Following actions have been done

- run a scan in normal et safe mode

- run Norton Power Eraser

- run CCCleaner

Strangely i can't find anything wrong.

How can I solve this issue? Is the system really infected or it's just a warning saying that SEP has done his job?

Thanks for your help

Raphaël