Some Mac users may have fallen victim to a new Mac malware called Proton. Over the weekend, the malware infected unsuspecting users by hitching a ride on a trusted server that hosted downloads for HandBrake, a popular DVD ripper and media encoding program. The malware provides a backdoor for malicious activity, such as stealing stored files. At the point of propagation, none of the 55 most widely-used antivirus services detected Proton. As of writing, the VirusTotal tracking website showed only 12 services that are capable of picking up on the new malware. Researcher Patrick Wardle has plenty of other Proton details listed on his blog.
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ORIGINAL SOURCE: Hardware Zone