didn't know "upx --ultra-brute" qualified as "none" ...
or did you unpack it before submitting it for scan ?
No, only unzipped from the outer zip.
BTW - in the past AVG (ok, for fairness: also some others, too) every now and then declared original Windows dlls to viral objects, e.g. the user32.dll
(
Link), also there are often false alarms, like
this one...