Malicious software

Here is everything that you need to know:

https://malwaretips.com/blogs/the-apple-security-warning-app-ads-fiancetrack2-dll-scam/

It is Malware and the article covers how to remove it at every level. It suggests to run Malwarebytes and I want stress that this is a safe program and is highly recommended in these forums. Never use antivirus or other cleaner apps as they will most likely cause more problems.

Hello Marnie759,

We see that you have some security concerns. Your Mac comes with built-in security to protect against malicious software, which is outlined at Protecting against malware in macOS - Apple Support.

There is additional information for active steps you can take outlined at Protect your Mac from malware - Apple Support.

If you have questions about the information in either article, just let us know.

Cheers!

Agree with Kurt Lang, you don't have to worry about this dll file running on the computer and the notification should be able to be removed in Safari settings. I assume you also checked the Pop Up Window and Notification permissions for the Websites at Safari > Settings > Websites.

I referenced Malwarebytes to give you a peace of mind that nothing nefarious is going on. It is the only malware detections software I would run and I wanted to make sure you didn't install the other antivirus or cleaner apps.

If this dll file notification did get through, it is possible that requests to install other software also got through like the fake "Need to Update Flash Player" message.

Any .dll (Dynamic Linked Library) is a Windows only file. It can do nothing to a Mac.

It may be in an email attachment. If elsewhere, and you know where it is on the drive, you can simply put it in the trash.

Or, and much more likely, per Mac Jim ID's link, it's nothing but a fake popup. There's no such item to find on your Mac, or any other computer. There's no need to run MalwareBytes or any other such software as there's nothing to find.