Pop up add

Use the Nice Catch Module in Good Lock to track down the background app causing these intrusive pop-up ads. Nice Catch is an official tool by Samsung designed specifically to log hidden device activities and pinpoint background culprits.

Please Note:
Nice Catch works flawlessly if a third-party app installed on your phone is pushing the ads out of nowhere. However, if these fake virus warnings only appear while you are actively browsing the web inside Chrome or Samsung Internet, it means a malicious website cached tracking permissions in your browser rather than an app on your phone. If Nice Catch doesn't log anything under "Detect Commercials," Completely Clearing your browser data will resolve it.

You installed something that included this. Instead of installing another app to clear this app, you can go thru your apps and uninstall the app you installed around when this issue started.