Using Windows, client uses Microsoft Edge. Everything is fully updated. I don't want to reimage for something this small. I want to spend the extra time and understand why I can't figure this out...
A user's browser sessions get hijacked by search.yahoo... there is nothing in Programs and Features as far as malicious programs installed. I've ran Malwarebytes and a couple others. Lots of PUPs uninstalled (including toolbars/hijackers like Spigot that relate to search.yahoo... there is 'spigot' even in the URL when the session is hijacked).
I've ran CCleaner and cleaned out a bunch of stuff, going through the list, I can see AppData relating to Yahoo. Here's an interesting point... the Malwarebytes report shows "restore session... https://search.yahoo.." for all browsers in AppData, but not for Edge.
I've gone through a bunch of Googling, sites constantly referencing this fix, but that is somewhat out of date as the steps are not really the same now. Plus, "search in toolbar" does use Bing (also noticed after even enabling Cortana, that you can't change the search provider). But this isn't a search provider issue since searching with Bing is what's being used. It's a launch on startup that is the problem. Even going to Home goes to a blank page. But changing the "Open Microsoft Edge With..." to Start Page, custom > https://www.google.com, etc... All still go to search.yahoo.../spigot...
Any ideas? I have lots of free time for this, the client doesn't need their computer, and I'm using this as a learning opportunity, not just simply completing the job as quickly as possible.