Mac Malware Breaks Into Top 5 Threats of 2019 Malwarebytes Labs. Of the top 25 detections across all platforms, six were Mac threats, the researchers discovered. Mac malware broke into the top five most-detected threats in the world for the first time ever. Mac users saw a yearly rate of 9.8 detections per device — more than double the amount of detections when compared to Windows users. At 3% of the total detections there is a Mac adware family known as NewTab.”]