Sales of Mac security software have jumped since news broke last week about a massive malware infection of Apple computers. Russian antivirus firm said more than 600,000 Macs had been infected with Flashback, many of them in a recent campaign that exploited an at-the-time-unpatched vulnerability in Oracle’s Java. Some Mac owners have been skeptical of claims that Flashback has infected hundreds of thousands of machines, and have accused antivirus vendors like Sophos of hyping the threat to sell software.”]