This pretty much confirms the detection, that an Avast Team member posted about.
Hi,
servscrpt[.]de is a domain used by a malicious payload to spy on Google/Bing/Yahoo search results and modify them. It has the ability to redirect arbitrary search results through servproc[.]de. This is most likely spread by a malicious browser extension: we recommend disabling suspicious ones and checking if the issue persists. If you figure out which extension was to blame, please let us know.
And also what actions others in this topic have taken to try and pin down what add-on is triggering this alert.
But what you got from avast in your Reply #27
1. Avast being up to date (virus definitions) wouldn't have an impact unless this were a false positive.
2. Resetting the browser back to defaults, would presumably remove all add-ons and probably resolve the problem until you put the add-ons back again.
So it doesn't seem to follow what 'Jan593' suggested, to track down the add-on responsible. Or what other contributors to this topic have done to try and find the add-on. All I as an Avast user can suggest is read through some of the other replies on what they have done to find the add-on and then remove that add-on.