Security issue: malware on iMac?
While online today (iMac Ventura 13.7.4) I received a popup saying that 4 viruses/malware were on my iMac; also a notice that a McAfee subscription was expiring today & I need to renew now. I don't have a McAfee subscription. I immediately shut down the iMac. How do I check to find if the iMac does in fact have malware & how do I get rid of it. I did not download anything as far as I know!
iMac 24″, macOS 13.7