Heur.BZC.PZQ.Boxter. still active every minute when system scan says its clean and im safe.
If i delete DomainAuthHost directory it comes back again, i cant find the .ps1 file responsible for powershell reinstalling it.
If i take ownership of that directory it makes another called SystemResourcesAgentV2 and puts its files in that instead.
It seems from other peoples comments that you've known about this issue for a few years but are unable to fix it.