The PC remains the biggest target for cybercriminals, but the Flashback Trojan infected up to 600,000 Mac computers in 2012. It was a small percentage of Apple's install base, but infections illustrated that Macs are not immune to threats, Panda said. The Trojan targeted a browser-based Java vulnerability, taking advantage of Apple's slow patching cycle. The infections prompted Oracle to begin phasing out support of Java on its systems. Java 7 is not supported on Snow Leopard.