How do I prevent virus on my Mac?

eason289 wrote:

why is there vireuse on my mac

[Re-Titled by Moderator]

Original Title: vires

Third party AntiVirus is not recommended— it typically does nothing but add issues to the macOS and competes directly with Apple’s own built in security:

macOS antivirus - Protecting against malware in macOS - Apple Support

macOS - Security - Apple macOS - Security - Apple

Apple Platform Security - Apple Apple Platform Security - Apple Support

Verify you are keeping your Mac current w/ stable release of macOS including bug fixes, security updates:

Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support

Protecting against malware in macOS

Protecting against malware in macOS - Apple Support

Effective defenses against malware and other threats… - Apple Community

Effective defenses against malware and ot… - Apple Community

for your issue, reference:

Block pop-up ads and windows in Safari

Block pop-up ads and windows in Safari - Apple Support

Stop unwanted Notifications - John Galt

Stop unwanted Notifications - Apple Community

Recognize and avoid phishing messages, phony support calls

Recognize and avoid social engineering schemes including phishing messages, phony support calls, and other scams - Apple Support

Are you getting pop-up notifications in the upper-right-hand of your screen, telling you that you have viruses?

Those are scam notifications being sent to you by Web sites. The scammers often include copies of the System Settings icon to try to fool you into thinking that it was your Mac or Apple who sent them. On Windows machines, these notifications have a different, more Windows-like appearance, but it's still the same old scam. The goal is to panic you into contacting criminals posing as "tech support" for "help" (in ripping you off), or, at the very least, to panic you into buying some "security" app that will do nothing to solve the non-existent "problem."

See the "Stop Unwanted Notifications" user tip for instructions on how to block these in Safari.

Also see:

U. S. Federal Trade Commission – How To Spot, Avoid, and Report Tech Support Scams

"Tech support scammers may try to trick you with a pop-up window that appears on your computer screen. It might look like an error message from your operating system or antivirus software, and it might use logos from trusted companies or websites. The message in the window warns you about a security issue on your computer and tells you to call a phone number to get help.

…

If you get this kind of pop-up window on your computer, don’t call the number. Real security warnings and messages will never ask you to call a phone number."

eason289 wrote:

why is there vireuse on my mac

There are no viruses that affect macOS, so there's that.

Please explain the reason for your concern.

There probably isn't. Mac specific viruses are exceedingly rare these days.

What exactly makes you think you have a virus?

If you explain your issue clearly and in detail, someone may be able to advise.