A long time ago, a fake antivirus named MAC Defender was widely circulated online among Mac users, and most Apple Mac OSX installed the application. It looks similar to an Antivirus app but maliciously accesses your system data through the Safari browser. It was transferred through web searches and malicious links that show up from the top search result on the Safari browser. At first, it prompts a fake alert saying that your computer is infected by malware, and then it downloads the fake antivirus zip folders using the JavaScript within the page. If you had accidentally installed the MAC Defender malware, procced with the quick steps given below to get rid of it.