Hello. I noticed recently that when I was playing my game from steam (Portal 2) occasionally, Avast closes it and moves the EXE to the Virus Chests for IDP Generic. I have no idea why this happens, (and before you ask, I don’t run a cracked/pirated version, I have the actual game on Steam) and it’s really annoying for me because sometimes when I’m trying to chill out it constantly blocks the EXE and i always have to restore it from the Virus Chest. This seems to happen when I try to load a menu that has Community Made levels (levels made by the users of the game) and I think it has something to do with it trying to connect to the internet. This is annoying and I keep thinking that there could be a real infection in the game but it’s most likely an annoying false positive.
I have no idea why this happens, (and before you ask, I don't run a cracked/pirated version,
Report a false positive (select file or website)
https://www.avast.com/false-positive-file-form.php
https://forum.avast.com/index.php?topic=14433.msg1289438#msg1289438
Probably part of GLaDOS’s revenge; after all if you played Portal 1 you did murder her. 
Hi Armel_08,
it’s hard for us to help you without the sample. Could you share VirusTotal link to the detected file?
Thanks,
PDI
Heres the Virustotal File
https://www.virustotal.com/gui/file/18b57b16d8cf8de731d91bff236bf84fbfe1e08c67169f582086dec0e100a8c8/community
I also have a Hybrid Analysis file (Hybrid analysis is a thing that scans EVERY part of the programs memory to detect viruses and I kinda found some interesting results here
https://www.hybrid-analysis.com/sample/18b57b16d8cf8de731d91bff236bf84fbfe1e08c67169f582086dec0e100a8c8/5d39dfb00388388f213fff36