Thanks Raymond 84 for posting this. My networked pcs went nuts with vbs malware gen warnings (all except for the one running AVG). Webshield reporting attacks were coming from my WD media box which struck me as odd. Two W10 pcs and one W7 had hundreds of results following scans.
By chance I reconnected one to the Lan the following afternoon and re ran the scan which was now clean. I was at the point of trying a clean and following up with malwarebytes. Thank goodness I didn't do that and found this thread. Very annoyed avast did nothing to contact users or go public with their mistake. Two thumbs down for them. Very poor PR.