Apple Updates Anti-Malware Tools to Address New Trojan Threat

Late last week, CNET reported on a new trojan horse threat targeting Mac users. While the threat was initially discovered back in late July and had yet to become fully functional, only recently was the malware highlighted by antivirus companies targeting such threats.

revir
Blurred screenshot of PDF file deployed by OSX/Revir.A (Source: F-Secure)

The new threat consists of two parts, with the first being a trojan downloader known as "OSX/Revir.A" that serves to distract users by downloading and continually opening a PDF document containing "offensive political statements" written in Chinese. But the actual damage from OSX/Revir.A comes as it installs a backdoor known as OSX/Imuler.A to potentially allow malicious parties to access the user's machine.

When the backdoor is installed, it will set up a launch agent on the system that is used to continually keep the malware active on the system. It will then connect to a remote server and send the system's current username and MAC address to the server, after which the server will instruct it to either archive files and upload them, or take screenshots and upload them to the server.

The report noted that the malware did not appear to function properly due to a lack of instructions being delivered from a remote server, but malicious activity could still be possible.

osx revir a xprotect
OS X malware definition entry for OSX/Revir.A

Apple has moved quickly to counter the threat, updating its malware definitions for Snow Leopard and Lion systems to allow them to recognize the trojan. Apple updated its tools earlier this year in response to the MacDefender threat, and Snow Leopard and Lion systems now automatically check for new malware definitions on a daily basis.

Apple's battles with malware authors continue, however, as CNET discloses that another trojan horse, known as OSX/flashback.A, has been discovered. Like a similar threat that surfaced early last month, the new trojan masquerades as a Flash Player installer to trick users into installing the package.

Unlike the previous Flash Trojan (called Bash/QHost.WB), which changed one file on the system, this new Trojan is a bit more complex and first deactivates network security features, then installs a dyld library that will run and inject code into applications that the user is running. The Trojan will also try to send personal information and machine-specific information to remote servers.

Users requiring Adobe's Flash Player software are of course advised to download it directly from Adobe's site rather than attempting to install it from sites which may be trying to trick users into installing malware. If past history is any indication, Apple should quickly update its malware definitions to help recognize the new threat, alerting users to the known malicious nature of the package should they attempt to download and install it.

Top Rated Comments

dOoBiX Avatar
126 months ago
I'm wondering if I came across that second one yesterday. I pulled up a video and got a pop-up that looked very authentic asking me to update my Flash Player. I closed it without clicking anywhere within it, and nothing downloaded, but I may have dodged a bullet by not installing it. I consider myself a very educated Mac user, but even I might have been convinced if that was it, had I not been in a hurry and not willing to wait for it to install.

I installed a flash update yesterday, and after reading this article, it got me worried. So I checked the CNET article (http://reviews.cnet.com/8301-13727_7-20111639-263/another-os-x-trojan-imitates-adobe-flash-installer/) and they have screenshots of the fake and real flash installers. My mac is good... for now. :)

Fake:


Real:
Score: 9 Votes (Like | Disagree)
gmcalpin Avatar
126 months ago
Dang it....that Apple specialist in the store told me mac is virus free when I was purchasing my MBP....wth....
Even the virus's have bugs :D
This is not a virus. It's a Trojan horse. They are two very different kinds of malware.
Score: 8 Votes (Like | Disagree)
benthewraith Avatar
126 months ago
Note that Flash is somehow involved. LOL
Yes, I'm sure taking a copy of Flash and rewriting it to make it malicious is the fault of Adobe just as much as torrented copies of iWork may or may not have been rewritten to install malware is the fault of Apple.:rolleyes:
Score: 8 Votes (Like | Disagree)
Dr McKay Avatar
126 months ago
Its good to see that apple actually update their os to stop this trojan threat. If only windows was as reliable...
Ahh good to see you're still clinging to the 10 year old idea of Windows and Microsoft.


Macs are being infected more because of all those stupid Windoze users who switched because of the "Mac vs PC" ads. Doh!
I do hope that was sarcasm, please say it was. If it wasn't I feel compelled to point out how wrong you are, Mac users are not smarter than PC users, nor are PC users smarter than Mac users. They are just computer users, no different from each other.
Score: 6 Votes (Like | Disagree)
AppleScruff1 Avatar
126 months ago
Bottom line is Windows is now more secure then OS X. Take that to the bank!

OSX is obviously a very secure OS and so is Windows 7.
Score: 5 Votes (Like | Disagree)
fahadqureshi Avatar
126 months ago
wonder what these "offensive political statements" are:rolleyes:
Score: 5 Votes (Like | Disagree)

Top Stories

tracking disabled ios 14 5

Analytics Suggest 96% of Users Leave App Tracking Disabled in iOS 14.5

Friday May 7, 2021 1:51 am PDT by
An early look at an ongoing analysis of Apple's App Tracking Transparency suggests that the vast majority of iPhone users are leaving app tracking disabled since the feature went live on April 26 with the release of iOS 14.5. According to the latest data from analytics firm Flurry, just 4% of iPhone users in the U.S. have actively chosen to opt into app tracking after updating their device...
macbook colors 3d black bezels

Prosser: Next MacBook Air Could Come in Colors Similar to iMac

Friday May 7, 2021 6:55 am PDT by
According to Apple leaker Jon Prosser, Apple's upcoming release of the MacBook Air will feature various colors, similar to the colors in the newly released 24-inch iMac. In the latest video of his YouTube channel Front Page Tech, Prosser says the same source who accurately provided him information on the first Apple silicon iMac coming in colors has told him that he recently saw a prototype...
tile amazon sidewalk integration

Tile to Leverage Amazon Echo and Ring Devices to Better Compete With AirTags

Friday May 7, 2021 2:07 pm PDT by
Amazon today announced that it is teaming up with Tile to add Amazon Sidewalk integration to Tile's Bluetooth trackers. Amazon Sidewalk, for those unfamiliar, is a network of Amazon Bluetooth devices that's designed to improve the connectivity of devices like the Ring and Amazon Echo. Tile will now be joining Amazon Sidewalk, and through this integration, Amazon Echo and Ring devices will be ...
Top Stories 59 Feature

Top Stories: Epic Games vs. Apple, Hidden AirTag Mode, Apple Music Hi-Fi, Colorful MacBook Air?

Saturday May 8, 2021 6:00 am PDT by
While we wait for the newly introduced iMac, iPad Pro, and Apple TV models to launch later this month, this week saw the kickoff of the big Epic Games v. Apple trial, with lots of juicy tidbits coming out as the two sides make their arguments. This week also saw some rumors about a Hi-Fi tier for Apple Music, more biometric sensing capabilities for Apple Watch, and timing for the...
zoom app icon

Apple Gave Zoom Access to Special API to Use iPad Camera During Split View Multitasking

Sunday May 9, 2021 2:00 am PDT by
Zoom, a hallmark platform used by millions during the global health crisis, has been given access to a special iPadOS API that allows the app to use the iPad camera while the app is in use in Split View multitasking mode. This case of special treatment was first brought to attention by app developer Jeremy Provost, who, in a blog post, explains that Zoom uses a special API that allows the...
snapchat dark mode

Snapchat Rolls Out Dark Mode on iOS

Wednesday May 5, 2021 1:17 am PDT by
Nearly two years following the release of iOS and iPadOS 13, which included native, built-in, and systemwide dark mode, Snapchat, one of the world's most prominent social media networks, has finally rolled out a dark mode theme for iOS users. Snapchat began testing a dark mode theme of its app design late last year with a small group of iOS users. Now, Snapchat says that as of this week, it...
tile sticker e1570533758981

Tile CEO: 'We Welcome Competition From Apple, But We Think It Needs to Be Fair'

Tuesday May 4, 2021 9:51 am PDT by
Just after Apple announced its AirTags, Tile CEO CJ Prober relayed his concerns about competing with Apple in the tracking space, and said that Tile would ask Congress to investigate Apple's business practices specific to Find My and item trackers. Prober this week did an interview with Bloomberg, where he further expanded on Tile's complaints about Apple and why he feels that Tile is...
fortnite apple logo 2

Epic CEO Tim Sweeney Admits App Store's 30% Cut Is Similar to Consoles, Would Have Accepted Special Deal With Apple

Tuesday May 4, 2021 1:54 pm PDT by
Apple's legal battle with Epic Games is continuing on, and during the second day of the trial, Epic Games' CEO Tim Sweeney continued his testimony against Apple. Sweeney was grilled by Apple's lawyers, and made several points seemingly favorable to Apple. In addition to mentioning how he prefers Apple's iPhone and values Apple's privacy policies that he's aiming to dismantle, Sweeney...
signal instagram ads3

Signal Shares the Instagram Ads Facebook Doesn't Want You to See

Wednesday May 5, 2021 1:29 am PDT by
Encrypted messaging app Signal has had a series of Instagram ads blocked from the social media platform, after it attempted to show users how much data the Facebook-owned company collects about them and how it's used to push targeted ads. In a blog post, Signal described how it generated the ads to show users why they were seeing them, simply by declaring upfront the information that the...
iphone 12 preorder purple

Apple Begins Transition to Randomized Serial Numbers With Purple iPhone 12

Wednesday May 5, 2021 9:17 am PDT by
MacRumors previously reported about Apple's plan to switch to randomized serial numbers for future products starting in early 2021, and this transition has now started with the new purple iPhone 12 model in multiple countries. With assistance from Aaron Zollo, host of the YouTube channel ZolloTech, we can confirm that the purple iPhone 12 released last month has a new 10-character serial...