Researchers from F-Secure, Webroot, and Avast have uncovered Janicab.A, a new trojan that was discovered as a threat to Macs last week and Windows users on Monday, with findings being published recently.

For OS X users, Janicab.A was signed with a valid Apple Developer ID and also uses a special unicode character known as a "right-to-left override" (RLO) that is used in email malware attacks. From there, the trojan uses a YouTube page to hijack infected computers, directs them to command-and-control (C&C) servers, and then leaves the server and hides the infection by making the malware appear as a harmless PDF or DOC file.

janicab_2a_malware
Webroot writes:

After a relatively long lag period without seeing any particular new and exciting Mac malware, last week we saw the surfacing of a new and interesting method of compromising the OSX system. Malware authors have taken a new approach by altering file extensions of malicious .app packages in order to trick users into thinking they are opening relatively harmless .pdf or .doc files. Changing file extensions in Mac OSX can be tricky due to a built in security feature of the OS that detects attempts to change the extension and automatically annexes the extension of its correct file or package type.

This news comes after Apple updated security definitions to combat 'Yontoo', an adware trojan this past March, while also regularly dealing with Java-related vulnerabilities. Apple introduced Gatekeeper in OS X Mountain Lion in order to better deal with security threats, offering a way for users to restrict installation of apps to those signed by Apple-issued Developer IDs.

Top Rated Comments

whooleytoo Avatar
101 months ago
Cross-platform malware? And the Mac version was released first? Yaaaay!
Score: 20 Votes (Like | Disagree)
blackcrayon Avatar
101 months ago
If it's signed with a valid developer ID shouldn't that mean Apple should've already revoked it? Which brings up a question, if Apple revokes a developer ID because of malware, does OS X notify you that was the reason? Or do they just say it's "invalid" (in which case lots of people will still right click and open it :)

(I'm guessing the File Quarantine feature should have this added as well by now)
Score: 12 Votes (Like | Disagree)
Michael Scrip Avatar
101 months ago


But what does it actually do? :confused:

It gets an article on MacRumors

:D
Score: 10 Votes (Like | Disagree)
jeznav Avatar
101 months ago
Not all OSX users have Adobe Acrobat Reader installed. Icon FAIL.

Should've used Preview.app PDF icon instead.
Score: 8 Votes (Like | Disagree)
Parasprite Avatar
101 months ago
Malware authors have taken a new approach by altering file extensions of malicious .app packages in order to trick users into thinking they are opening relatively harmless .pdf or .doc files.

New because of the .app part maybe, but .pdf.exe is not a new approach by any means.

Also, who here uses Adobe for PDFs? (beyond filling out that one form that didn't work right in Preview for some reason)
Score: 3 Votes (Like | Disagree)
antonis Avatar
101 months ago
Still, don't get surprised if people that don't even have the adobe reader installed on their mac will still open a "pdf" that is using the acrobat icon. There are users and users.
Score: 2 Votes (Like | Disagree)

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