Pop Up Warning on MacBook Pro

Not a new problem. Pop-ups have been around forever and are becoming more prevalent.

Try this for pop-up problems:

Force Quit Safari ( command + option + esc keys).Then restart Safari holding the Shift key. If you still have problems Empty Caches (Safari menu > Preferences > Privacy > Remove all website data. (This will also remove history if you do not want to remove History open Safari Preferences > Advanced and check mark “Show Develop Menu” then choose “Empty Caches” from Develop Menu ).

Then go to Safari Preferences > Extensions and check there. If there is an extension delete it.

If the problem persists then download and run Malwarebytes. Malwarebytes was developed by one of our own colleagues here in ASC and is about the most proven anti-malware software for Mac.

nvbr wrote:

I've received two pop-up warnings about a "back-door" virus on my MacBook Pro. Of course I did not follow any instructions and ran my malware program. Is this a new problem for Apple products?

No.

Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

The advice I gave you will clear the pop-ups you already have but will not stop future pop-ups. You need to stop visiting the sites that are serving them.