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⇒ Note: Use the solutions below only if you’re positive the apps you’re trying to run are safe. Make sure to install the latest macOS updates so that you can benefit from the latest security updates and help your device successfully fight off malware. Well, that stubborn CoreServicesUIAgent verifying window may indicate the respective app is ridden with malware. If you’re like me, you probably wait a couple of weeks before installing the latest macOS version on your machine. If they do, let them clean the threats out of your Mac. Check if these two tools detect anything suspicious. After you force quit the problematic app, run the free Malwarebytes anti-malware tool and the free EtreCheck tool. Prevention is always better than cure, so treat that stubborn “ CoreServicesUIAgent is verifying the app” alert as an indicator for a potential malware snare. You can go straight to the next step or restart your Mac to make sure all the temporary files associated with that problematic app get flushed out of the system. The Activity Monitor is your best friend when it comes to killing pesky apps or processes that refuse to close. Alternatively, navigate to Applications, select Utilities, launch the Activity Monitor and force quit both the app and the CoreServicesUIAgent. Press and hold the Option + Command + Escape keys to force the problematic app to quit. Fix: I Can’t Close a Verifying CoreServicesUIAgent Window Force Quit the App

The only thing that users can do is to minimize the window. The problem is that the CoreServicesUIAgent window doesn’t always go away. That’s why you may sometimes get a “ CoreServicesUIAgent is verifying the app” alert. When you install apps outside of the App Store, the system automatically verifies them to ensure they don’t inject malware into your computer. The CoreServicesUIAgent is a built-in GUI agent that informs users the system needs to verify third-party apps in order to make sure they don’t pose any security threats. GateKeeper is a native macOS security feature that monitors and blocks malware coming from the apps you installed on your machine.