Sponsored ad contains malware - ScanGuard is malware
This sponsored ad leads to a page rating antivirus software. One of them, ScanGuard is a well known malware/virus. It took me a couple of hours to remove it from my computer. Please do not expose us to known malware under the guise of antivirus apps.

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Chuck Milne commented
Yes, it was a sponsored ad on Yahoo.com
When I logged on the page, it listed some ratings of the best antivirus/antimalware apps. https://www.the10topantivirus.com/best-free-antivirus-obavtrk?cep=vOsznXSDEje9LrjDFiM3WSes6J1H53HCYWb3uGFSiuX5igfPgG0wDlQdugXNb6Ab4102090vc0Z_Ay7QRpAFl6qK6y0xDO7ZzS4DLSNIP8q6K82h08inY-tc2yRPq0VZXlYO-FckVKBELQ9tiIO3MckgevqbAKKHcINv8IARIZefnSSewgvWvXvMmWC7MU1bf99HHUPeY4pV599CmQopID--D6ntpnNlMoXZtNbXWfoK9eaS4C7oqJvyok4oTYT5bRFtu2w-M3lSyFhXLLqjlGVl0BvBN7ZE7uFjsNtOqChgW-WSz0ThlRqvd3M_AFiF5vL8v-w1j5F4OIkaOmokq-YwRPbB_RpwQeR2neiu_PLbk7BQ3PFLxy0JNPT0Hk2u&campaign=$%7BCAMPAIGN%7D&network=$n&creative=$34329092498&source=HOMEPAGE_US&publisher=$(PUBID)
When I clicked on Sanguard, it downloaded a program. When I tried to install the free version to try, I realized that it had in program fees. I then used AppZap to remove all the related files. The next time I booted my computer (MacBook Pro late 2011, running OS 10.12.6), it opened an app with a window that asked to pay an upgrade the ScanGuard. I located that file, quit the app and deleted the library file. Then the next time again that I booted my computer, it appeared again. I again quit the app and deleted it. When I rebooted my computer, again the app was running. Then I searched and found out that the antivirus program (Scanguard) is a scam and a malware app, not an antivirus app. I then searched and spent 2 hours finally deleting the hidden app that ran when I booted my computer. That was the result of looking at several websites devoted to removing ScanGuard specifically. https://removeosxapp.com/removeguides/remove-scanguard-macos/#comment-376?
How To Remove ScanGuard from your macOS and Mac OS X?I first loaded the Scanguard on August 4, and finally got rid of it on August 6. I do not know the times and this sponsored ad was still showing on Yahoo.com this morning. It is not there now.
Here is the URL for the sponsored add with ScanGuard - Free Antivirus Software Comparison 2018 - Best Free Antivirus Protection
Free Antivirus Software Comparison 2018 - Best Free Antivirus Protection
Free Antivirus Software Reviews 2018. Compare Free Antivirus Software Providers Side-By-Side.I was using the Safari browser.
Thank you for looking into this.