Malvertising-focused trojan known as Shlayer has burbled to the top of the malware heap for Mac users. It made up 29 percent of all attacks on Mac devices in Kaspersky s telemetry for 2019, making it the No. 1 Mac malware threat for the year. Shlayer is a trojan downloader, which spreads via fake applications that hide its malicious code. Its main purpose is to fetch and install various adware variants, including AdWare.OSX.Bnodlero and AdWareOSXX.Geonei.
Source: https://threatpost.com/shlayer-mac-youtube-wikipedia/152146/