False virus pop-ups, not on a browser

Check your Safari settings. Go to Safari > Settings > Websites > Notifications

Are they any sites listed that have authorization to display notifications? You can safely delete all websites in this list. Websites will then ask again and you can deny them this time.

I don't see any malware or scam ware in your EtreCheck report. It does show two Safari notifications. In the past, those would have Safari icons when they display. But lately it seems like websites are able to specify their own icons. It makes sense that scam sites would use the settings icon to try to trick you.

Excerpted from Effective defenses against malware and other threats - Apple Community:

Beware spontaneously appearing, unsolicited popups demanding immediate action. Think before you click.

• ...
• The same goes for website Notifications — attention-getting banners that appear at the top right corner of your screen. Safari gives you a great degree of control over them: Customize website notifications in Safari on Mac. Most of those Notifications are simply annoying, but some are intended to frighten and deceive you into installing something nefarious.

etresoft has the answer.

If a website asks to send Notifications, you should reflexively "just say no."

Download and run the free version of Malwarebytes. It was developed by a long time contributor to these forums and a highly respected member of the computer security community.  It will detect adware and malware and ask you what you want to do with it.

Download and run Etrecheck.  Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support  to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.

Copy the report

and use the Additional Text button to paste the report in your reply.

Then we can evaluate the report to see if we can determine the cause of the popups.

Ask You is malicious adware. It got installed by you when you installed something else. Possibly from a legitimate site that offers downloads of all kinds of demo, shareware and free software. Or, it came along with illegal, cracked software you may have installed.

No matter how it got there, it can be removed. It's just a matter of finding it. That MalwareBytes came up empty suggests it's fairly new. The only reference I found to it is from November 12th of last year.

Follow Old Toad's recommendation to run EtreCheck and post its results here.

Unfortunately, it wasn't much help. As the author of EtreCheck noted not very long ago, it's no longer as simple as looking for .plist files, or Launch Agents. Startup items can be hidden within an app.

Open System Settings. Click on General > Login Items. Do you see anything under Allow in Background you don't recognize?

Check your notification settings and the apps that you have installed. One could be throwing such notifications.

I see nothing in the report that indicates that Ask You exists in the system. If it goes by another name it doesn't jump out.

Maybe Kurt will see something I missed.