Message received Detected Trojan Virus on mac.

This is a scam pop-up.

Close the window. Quit Safari.

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Relaunch Safari holding the Shift key down.

Pop-ups

Scams:

  Section: If you see pop-up alerts or ads   https://support.apple.com/en-us/HT204759

Please read Phony "tech support" / "ransomware" popup… - Apple Community.

A short explanation of the URL. I see that "apple.com" is in the URL, but that isn't the domain "apple.com", the TLD (Top Level Domain) there is "live". The URL used in that message was specifically crafted to make you believe it is from an official Apple website (apple.com)—this is one of the tricks that scammers use in phishing attacks.

This is a phishing scam, Apple NEVER EVER tell you that you have a problem!!!

It is a SCAM

that link redirects to another web site

http://maccleaner3......

That is not an Apple sight. It is thieving scammers trying to convince you that you have a trojan. They will be asking for money, credit card info, or personal info after they sufficiently scare you.