[This page hasn’t been updated for several years, and probably won’t be again. While OS X isn’t exactly a hotbed of malware – especially when compared to Windows – there is a lot more Mac malware than there used to be, and I don’t think it would be useful or practical to go on trying to list it all here.]
[Updated 7th November 2011]
Added links to some further information from F-Secure about OSX/Devilrobber to the appropriate section below.
[Updated 4th November 2011]
I’ve just been reminded of a threat descriptions database I should have added to this list: PC Tools’ iAntivirus page includes a threat descriptions page here. Brief descriptions, but plenty of them.
[Updated 1st November 2011]
OSX/Devilrobber (a.k.a. OSX/Miner)
- It opens ports and listens for C&C servers
- It steals GPU (Graphics Processing Unit) cycles to generate Bitcoins in order to defraud the Bitcoin service, and if it finds a Bitcoin wallet on the infected machine, steals that too
- It acts as spyware, forwarding usernames and passwords to a remote server
- It noses around looking for other stuff like the keychain file, bash history file, Safari history file, and takes and forwards screenshots
- It may also be looking for files that contain child abuse materia
The program has been spread hidden inside copies of GraphicConverter, which is a legitimate image editor. However, the infected copies were distributed via Torrent sites such as PirateBay. Interestingly, the program will terminate on infection if it finds Little Snitch installed: otherwise, it will be launched at every reboot.
- Devilrobber: Bitcoin Miner preys on Snow White
- New Malware DevilRobber Grabs Files and Bitcoins, Performs Bitcoin Mining, and More
- DevilRobber Mac OS X Trojan horse spies on you, uses GPU for Bitcoin mining
- Backdoor:OSX/DevilRobber.A [Added 7th November 2011]
- F-Secure description [Also added 7th November 2011]
A version of the elderly Linux/Tsunami malware (also known as Kaiten), recompiled as a Mach-O binary to run on OS X. Low risk, but apparently a work in progress: a second version shows some “improvements”. More info:
- OSX/Tsunami: flooding new markets
- OSX/Tsunami: a little more water with that
- OSX/Tsunami.A: old code, new platform
- Updates on OSX/Tsunami.A, a Mac OS X Trojan
- Linux Tsunami hits OS X
- Tsunami backdoor for Mac OS X discovered
- Backdoor:OSX/Tsunami.A (blog)
- Backdoor:OSX/Tsunami.A (description)
[Updated 28th October 2011]
Sophos Mac Malware Descriptions
You may notice that this page is nowhere near keeping up with the flood – ok, trickle – of Apple-targeting malware that we’ve seen this year. No, that doesn’t mean there wasn’t any: it means that this page is a low priority. I should, however, certainly have mentioned before Graham Cluley’s excellent article “The short history of Mac malware: 1982 – 2011” – in fact, I did mention it, but only in the main Mac Virus blog, not as a resource to check on for malware descriptions. It’s not encyclopaedic, but it’s certainly an excellent summary.
[Updated 26th February 2011]
Blackhole RAT (darkComet, MusMinim):
Updated 1st April (no, I don’t think it’s a joke)
SecureMac describes a later variant it’s labelled BlackHole RAT 2.0a, which is said to be distinctly different to the variant described by Intego.
Updated 30th March (info on later variants)
- BlackHole RAT is Really No Big Deal
RAT (Remote Access Tool) which targets both Windows and Mac users. Described as a beta version by its author, but already includes an interesting range of functions. The user interface includes some German words/command options. The author refers to it as Blackhole ( but Sophos analysis indicates that it’s a variant of the Windows malware commonly referred to as darkComet: however, the apparent author of darkComet has denied it and says he’s developing his own – oh joy…). Sophos detects it as OSX/MusMinim-A: other AV researchers have samples, so other products will detect it too (contact your vendor if in doubt).
[Updated 22nd January 2011]
Symantec blog on the high proportion of Macs recruited into the Boonana botnet.
[Updated 21st January 2011]
I can’t believe I forgot to mention that Graham had updated his blog post to include Autostart! But he did.
Meanwhile, I came across a description of the Top 5 malicious programs that affect OS X, according to malwarecity.com, which is a BitDefender initiative. It includes short but to-the-point descriptions of:
[Updated 24th November 2010]
No, this is not the week I get on with adding some more descriptions to this page. In the New Year, maybe. In the meantime, though, I notice that Graham Cluley has put up a blog including the highlights of Apple-targeted malware to date. While it’s not particularly detailed or comprehensive (surprisingly, it doesn’t mention 1998’s AutoStart worm), it’s accurate (as I’d expect), and you may find it of some interest.
[Updated 22nd September 2010]
Predictably, my virtual ear has just been bent by someone assuming that because there are only a couple of descriptions here, that’s all the OS X malware there is. Sorry, but it isn’t. I simply don’t have time to put into this project right now: going back over descriptions for earlier malware simply isn’t a priority, and right now I’m up to my ears in conferences and can’t find time even to detail more recent malware.
Perhaps Old Mac can find some time for this, but I wouldn’t bet on it. As I remarked in a comment below, ESET’s OS X sample collection is now well into the thousands. There’s some information on the most common malware types and families in the EICAR paper on Apple security on the resources page at https://macviruscom.wordpress.com/mac-malware-resources/papers/ though that paper is now quite a few months old.
Ryan Russell’s blog at http://ryanlrussell.blogspot.com/2006/10/os-x-malware.html is not up-to-date (he didn’t have time to update either) but includes more individual items than I’ve managed so far.
[Updated 14th June 2010]
This is an embryonic information resource with information (or links to information) about specific Mac threats. This may not be the biggest project in the world (Mac threats tend to be counted in hundreds, not tens of millions, as is the case with PC threats), but it will take a finite amount of time, which I’m a little short of, so in the first instance, at least, I’m likely to add descriptions as they’re asked for, rather than chronologically or in order of importance. Descriptions may also be modified as I find time to work on them, and the format is likely to become a little less rough-and-ready.
Also Known As:
Associated with software calling itself PermissionResearch or PremierOpinion
1st June 2010
Discussion on Mac Virus:
Information from Intego, including initial alert:
Discussion on the ESET blog:
Analysis by Methusela Cebrian Ferrer: http://ithreats.net/2010/06/02/premieropinion-spyware-now-in-mac-os-x/
Discussion by Paul Ducklin: http://www.sophos.com/blogs/duck/g/2010/06/02/mac-osx-monitorware/
Description by McAfee: http://vil.nai.com/vil/content/v_267638.htm
Also Known As
Troj/MacSwp-A, OSX_MACSWEEP, MacSweeper
The first OSX scareware (or fake security application), or at any rate the first widely-recognized as such. Published by “KiVVi Software”, who covered themselves with glory by stealing most of the text from their self-description from Symantec’s web site, changing only the company name.
Most of the descriptive material applying to OSX/iMunizator also applies to MacSweep: in fact, some sources reported an almost identical screen for both “products” saying “Get rid of compromising files now”, and claiming that the product was “3-in-1 Internet cleaner, System cleaner, and Performance optimizer for your MAC” The program flags a number of perfectly legitimate applications as privacy violations, malware, bad cookies (Down, Cookie! Down, boy! Naughty Cookie!), compromising files and so on , and anyone trying to remove them is told they need to buy the MacSweep software.
Perhaps the most interesting thing about these early Mac-specific ventures into the rogue application market is that they were also early examples of rogue security software that presents itself as something other than straightforward fake anti-virus or fake anti-spyware. Presumably the authors were taking into account that most Apple-users don’t believe that there is any Apple malware.
Also Known As
OSX/iMunizator, OSX/Imunisator, Troj/MacSwp-B, OSX_MACSWEEP.B, OSX/AngeloScan
Late March, 2008
As the fact that some vendors call it MacSweep.B indicators, Imunizator was essentially a retread of OSX/MacSweep (MacSweeper), the first OSX scareware (or fake security application), or at any rate the first widely-recognized as such.
The “call to action” in this case was a screen saying “Get rid of compromising files now”, and claiming that the product was “3-in-1 Internet cleaner, System cleaner, and Performance optimizer for your MAC” (that’s the capitalization offered by the product’s screen, not mine: I know the difference between a raincoat, an Apple computer, and a Media Access Control address…).
Wouldn’t it be nice if you could get an application to clean the Internet?
The program flags a number of perfectly legitimate applications as “trash”, and any victim naive enough to try to remove them is told they need to buy the Imunizator software. Amusingly (in a black sort of way), Imunizator tries to tell you that the apps it flags may compromise the victim’s credit card.
Perhaps the most interesting thing about these early Mac-specific ventures into the rogue application market is that they were also early examples of rogue security software that presents itself as something other than straightforward fake anti-virus or fake anti-spyware. Presumably the authors were taking into account that most Apple-users don’t believe that there is any Apple malware. (Yes, I said that about MacSweep, too.)
David Harley CITP FBCS CISSP
Mac Virus Administrator