Thanks, I have submitted it using the support menu now. Today I got message from MalwareBytes also and they updated their definitions and their new definitions also identify this file as unwanted application/trojan. Also I now remember that I did this before (but after making the forum post I think), but I now also made a manual definition update so I saw the file was being uploaded. We will see how long it takes before Avast does anything about it.
Yes, I have now avast and avira installed together. I used to have avast in some machines and avira on some other machines, but now I see it may be better to have them both. At least avira/malwarebytes seems to respond much quicker in this specific case. Of course it means nothing in general but I hope avast can update their definitions by tomorrow at least.