Avast blocking Microsoft Update KB3126593

Avast Enterprise Version 8.0.1606 Definitions version 160210-0
Blocking Windows Update KB3126593 – Windows 7 Pro
Detecting as Win32:Aluroot-B [Rtk]" virus
Need this solved ASAP

Makes the update fail…

Please submit a ticket to avast.

I concur same issue happens with me. I got around it by excluding the File "C:\Windows\SoftwareDistribution\Download*

You can report a suspected FP here: https://www.avast.com/false-positive-file-form.php