Not finding this virus/worm that attaches to program files of avast. just add to detection list if can . found by emisoft
Post the detection info from emisoft (file name, location and malware name) as I would suspect it isn’t a good detection.
You could also check the offending/suspect file at: VirusTotal - Multi engine on-line virus scanner and report the findings here, post the URL in the Address bar of the VT results page.