Apple has posted an article (http://support.apple.com/kb/HT4650) on “how to avoid or remove Mac Defender malware.”
A recent phishing scam has targeted Mac users by redirecting them from legitimate websites to fake websites that tell them that their computer is infected with a virus. The user is then offered Mac Defender “anti-virus” software to solve the issue.
This “anti-virus” software is malware (i.e. malicious software). Its ultimate goal is to get the user’s credit card information, which may be used for fraudulent purposes. The most common names for this malware are MacDefender, MacProtector and MacSecurity.
Apple says it will deliver a Mac OS X software update soon that will automatically find and remove Mac Defender malware and its known variants. The update will also help protect users by providing an explicit warning if they download this malware.