Mac users are targeted in a new tech support scam that can cause a Denial-of-Service (DoS) attack on their machines. When users visit a specific malicious scam webpage, the webpage determines the OS version via a user agent check and then pushes one of the two kinds of DoS attacks.
The first kind exploits on an older version of Mac OS to keep drafting emails, without actually sending them, and cover open windows. The second kind targets users with fully updated Mac OS by opening up a series of iTunes windows. The opening up of draft emails and iTunes windows eventually cause the infected machine to run out of memory and freeze. Victims are then asked to contact a tech support hotline, where they would be asked to pay to restore their machines.