I. Mac Antivirus Internet Security Software - AvastĪvast Mac Security is a free antivirus to protect your Mac from the growing number of malware threats, with on-demand antivirus scanning & background on-access protection. It's time to take some measures to get your Mac carefully protected from prying eyes and malicious attacks! Top Mac Security Software You Should Know Kitm – ran commands on machines for victims at the Oslo Freedom Forum Hackback – ran commands on machines for victims at the Oslo Freedom Forum LaoShu – spam via undelivered mail parcels Appetite – Trojan targeting government organizations Coin Thief – stole bitcoin login credentials via cracked AngryBird applications. Some of the most common OSX malware in 2015 were: Lamadai – backdoor Trojan targeting a Java vulnerability. During the 10 week study, over 1,400 unique malware samples were collected and analyzed.