New Mac trojan found hidden in PDF file

Summary:A newly discovered Mac vulnerability disguises itself as a PDF to trick users into opening it, which installs an Apache server on your Mac. Luckily it hasn't been weaponized. Yet.

New Mac trojan found hidden in PDF file - Jason O'Grady

Just when you thought that it was safe to start using your Mac again comes a report that a new PDF vulnerability may be targeting Mac users.

Fellow ZDNet blogger Ryan Naraine brings the news via his Zero Day blog, that the malware, Trojan-Dropper:OSX/Revir.A "installs downloader component that downloads a backdoor program onto the system, while camouflaging its activity by opening a PDF file to distract the user."

Lovely.

F-Secure notes that the vulnerability disguises itself as an Adobe Acrobat (PDF) file in an effort to trick users into opening it, which of course, triggers its payload. It even opens a bogus Chinese-language PDF in order to deceive the user and avoid detection. The payload, Backdoor:OSX/Imuler.A according to F-Secure, then runs in the background.

The good news, I suppose, is that Revir.A is fairly innocuous at this point. The payload is a bare Apache installation that is "not capable of communicating with the backdoor yet." The going theory is that the author may have leaked it to see if any of the antivirus detectors picked it up. Luckily, someone did.

It's important for Apple to act swiftly on this one. From the looks of things Revir.A probably wouldn't be too hard to weaponize and we're not sure how many people might already have the source code.

Apple: you're on the clock.

MD5 hashes for the samples:

• Trojan-Dropper:OSX/Revir.A: fe4aefe0a416192a1a6916f8fc1ce484 • Trojan-Downloader:OSX/Revir.A: dfda0ddd62ac6089c6a35ed144ab528e • Backdoor:OSX/Imuler.A: 22b1af87dc75a69804bcfe3f230d8c9d

Topics: Apple, Hardware, Malware

About

Jason D. O'Grady developed an affinity for Apple computers after using the original Lisa, and this affinity turned into a bona-fide obsession when he got the original 128 KB Macintosh in 1984. He started writing one of the first Web sites about Apple (O'Grady's PowerPage) in 1995 and is considered to be one of the fathers of blogging.... Full Bio

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