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There is now a third variant of the Mac malware called “Tibet.”

The first version of the malware, OSX/Tibet.A, first came into the spotlight in March 2012. At the time, experts called it Tibet because they found it emails specifically sent to Tibetan non-governmental organizations, said researchers at security firm Intego.

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Now, Intego has come across the OSX/Tibet.C malware. They identified the sample on VirusTotal, and they consider it a low-risk threat.

The threat distributes via a Java applet hosted on a website. Two patched Java vulnerabilities (CVE-2013-2465 and CVE-2013-2471) suffer exploitation in an effort to automatically download and launch a Java archive that contains a backdoor.

Cyber Security

Once it ends up installed on a system, Tibet.C creates a couple of files. One of them, /Library/LaunchAgents/, ensures the malware executes on each startup. The second file, /Library/Audio/ Plug-Ins/Components/AudioService, is the actual backdoor.

The malware receives its commands from a server located in China.

Mac users can protect themselves against the threat with an antivirus program or by making sure their Java software is up to date.

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