Pop up virus warning

I am getting a pop-up in the top right corner of the screen warning me of a trojan virus. It's made to look like it's from Apple with the System Setting icon, but I ran Malwarebytes and it doesn't say I have a problem. See the attached screenshot of one of the pop-ups. They don't always say the same thing, but they're all clearly trying to get me to click. Can anyone help me?