Avast uses a heuristic? The Problem with a heuristic is that the posibility of false alarms is much higher, than having a good, up to date Database. And the more “agressive” the heuristic is, the more Malware it finds, but the more false alarms it reports.

I rate a good unpacking (UPX, ASPACK) engine higher than a “agressive” heuristic.

But that is only my opinion. :slight_smile: