Hi Faergor,
You are very welcome.
A [HJ.Name] detection is short for name hijackers malware.
Those malware run process with names that match those used by legit Windows process, like smss.exe, csrss.exe, lsass.exe, etc. but from different folders. In your case, since the process is located in %WINDIR%\system32\ directory, which is where csrss.exe should be, we can conclude it's a false positive / bug.
Regards.