Remember that Flashback malware that infected over 600,000 Macs? It’s back, all because Mac users aren’t updating their Apple software, which includes the patch that blocks the malware, according to Venture Beat.

The new version is called Fashback.S, and it’s more dangerous than the first version. This version of the malware doesn’t need to be activated by prompting people to download a plug-in or enter a username and password into a fake software update field, it starts up immediately when you go to an infected website. The new version can only access computers that don’t have the updated Apple software that has the Java patch to block the Flashback malware.

Macs are becoming more prone to virus and malware attacks, so make sure your computers are protected. Many of the top security software suites that we review offer Mac software to help protect against viruses and malware. Check out our reviews here and compare the security software to find one that is right for you.