Shlayer is most prevalent Apple Mac attack in 2020 & can be avoided by simply avoiding fake Adobe Flash updates

https://lifehacker.com/how-to-avoid-the-most-popular-mac-malware-shlayer-1841207308

According to a recent Kaspersky investigation, the “Shlayer” malware—which deploys an “Any Search” bar on a victim’s computer through fake Adobe Flash updates, of all things—is the most popular Mac malware. Ars Technica has a detailed breakdown of the investigation that is worth a read.  Most malware and adware-deploying ads can be circumvented with an adblocking browser or content-blocking extension, and an anti-virus or anti-malware program will catch threats before they’re installed.  There’s no reason to install, update, or use Flash Player to access online content in 2020, save for very rare exceptions. If you need to download Flash, get it directly from Adobe. Nowhere else.