Malwarebytes’ found this Trojan.Agent.UPX in the latest version of Avast in C:\Program Files\Avast Software\Avast\setup\Instup.dll. What’s up with having a virus in AVAST ANTI-VIRUS!!! Can anyone explain this?
Old news and it is already solved.
It was a false positive from Malwarebytes.
Before posting please (re)search.
https://forum.avast.com/index.php?topic=181158.msg1281016#msg1281016