Infekted: Zombies Revenge Mac OS

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The Russian antivirus vendor Dr. Web has reported the spread of a new botnet that exclusively targets Apple computers running Mac OS X. According to a survey of traffic conducted by researchers at Dr. Web, over 17,000 Macs worldwide are part of the Mac.BackDoor.iWorm botnet—and almost a quarter of them are in the US. One of the most curious aspects of the botnet is that it uses a search of Reddit posts to a Minecraft server list subreddit to retrieve IP addresses for its command and control (CnC) network. That subreddit now appears to have been expunged of CnC data, and the account that posted the data appears to be shut down.

The Dr. Web report doesn’t say how Mac.BackDoor.iWorm is being distributed to victims of the malware. But its “dropper” program installs the malware into the Library directory within the affected user’s account home folder, disguised as an Application Support directory for “JavaW.' The dropper then generates an OS X .plist file to automatically launch the bot whenever the system is started.

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The bot malware itself looks for somewhere in the user’s Library folder to store a configuration file, then connects to Reddit’s search page. It uses an MD5 hash algorithm to encode the current date, and uses the first 8 bytes of that value to search Reddit’s “minecraftserverlist” subreddit’—where most of the legitimate posts are over a year old.

Zombies

The CnC posts appear to now have been expunged from Reddit, and a survey of the most recent servers identified in the subreddit by Ars found that most of their IP addresses, scattered around the world on systems that were apparently compromised—including computers in Slovakia and at Marist College in Poughkeepsie, New York—are now unreachable. The Marist College node, based on its IP address, was a virtual machine running in the college’s private cloud.

However, it’s unlikely that the botnet has been completely shut down. The malware has the capability of downloading additional files and executing commands on the infected systems, so a new version of the botnet may have already been distributed—along with other malware spread through it.

Security journalist Graham Cluley reports that Dr. Web and Bitdefender both detect variants of the botnet, (which Bitdefender refers to as Mac.OSX.iWorm). There are also ways for Mac owners to defend themselves against the malware. Developer Jacob Salmela has posted instructions on how to create a set of OS X folder actions that will alert a user if their system becomes infected.

Revenge

If you let yourself get tempted into installing the pirated versions of iWork or Photoshop CS4 that circulated on Bit Torrentearlier this year, you may have unwittingly turned your Mac into a zombie. Security researchers for Symantec have turned up evidence that these zombie machines are being used to create a Mac-based botnet.

Botnets are used to perform DDoS attacks on systems, gather sensitive personal information, and send out a majority of the spam that clogs up the 'Net. While commonly made out of infected Windows computers, this is the first known attempt to create one from Macs.

The two variants of the iServices trojan, OSX.Trojan.iServices.A and OSX.Trojan.iServices.B, have been implicated in at least one DDoS attack. According to researchers Mario Ballano Barcena and Alfredo Pesoli, the malware has peer-to-peer communication, remote start-up, and encryption capabilities.

'The code indicates that, wherever possible, the author tried to use the most flexible and extendible approach when creating it—and therefore we would not be surprised to see a new, modified variant in the near future,' according to their report. They also noted that the person who activated the botnet is not the same as the original author of the malware code.

Infected: Zombies Revenge Mac Os Catalina

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After the trojans were reported in January, most anti-virus software was updated to remove the payloads associated with the iServices trojans. Removing the directories /System/Library/StartupItems/DivX and/or /System/Library/StartupItems/iWorkServices should help, but that doesn't rule out other remnants getting left behind—if you suspect you were infected with either of these trojans, you may want to look into AV software. We'll also again repeat our favored refrain of 'Steer clear of pirated software and sketchy files from website or torrents,' which should help you avoid infection in the first place.

Infected: Zombies Revenge Mac Os 7

While Mac OS X doesn't suffer from the sheer amount of malware that Windows does, the creation of this botnet should serve as a warning that security through obscurity isn't a sound security policy—and Macs are far from being obscure any more.

Further Reading

  • Researchers Mario Ballano Barcena and Alfredo Pesoli take a detailed look at what appears to be the first real attempt to create a Mac botnet in their report, 'The new iBotnet,' available from Virus Bulletin (subscription required).