While I "greatly" appreciate the fact that you software blocked the programs, I don't understand why it did not remove them.
it usually blocke before anything can be downloaded...but maybe something managed to sneek in. no security program have 100% detection

what did the avast popup say?..right click avast tray icon…show last popup…take screenshot and attach here

When I got up this morning, I looked at the alerts, did a search for the file listed in the alert, found another program that removed the issue in a matter of minutes.
what program was that? what was detected and removed?