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Warning: Mac OS X Trojan Horse making the rounds
Wednesday, October 31, 2007 - 03:40 PM EST

"A malicious Trojan Horse has been found on several pornography web sites, claiming to install a video codec necessary to view free pornographic videos on Macs," security software vendor Intego reports. "A great deal of spam has been posted to many Mac forums, in an attempt to lead users to these sites. When the users arrive on one of the web sites, they see still photos from reputed porn videos, and if they click on the stills, thinking they can view the videos, they arrive on a web page that says the following:"

Quicktime Player is unable to play movie file.
Please click here to download new version of codec.


Intego reports, "After the page loads, a disk image (.dmg) file automatically downloads to the user’s Mac. If the user has checked Open 'Safe' Files After Downloading in Safari’s General preferences (or similar settings in other browsers), the disk image will mount, and the installer package it contains will launch Installer. If not, and the user wishes to install this codec, they double-click the disk image to mount it, then double-click the package file, named install.pkg."

"If the user then proceeds with installation, the Trojan horse installs; installation requires an administrator’s password, which grants the Trojan horse full root privileges. No video codec is installed, and if the user returns to the web site, they will simply come to the same page and receive a new download," Intego reports.

"This Trojan horse, a form of DNSChanger, uses a sophisticated method, via the scutil command, to change the Mac’s DNS server (the server that is used to look up the correspondences between domain names and IP addresses for web sites and other Internet services). When this new, malicious, DNS server is active, it hijacks some web requests, leading users to phishing web sites (for sites such as Ebay, PayPal and some banks), or simply to web pages displaying ads for other pornographic web sites. In the first case, users may think they are on legitimate sites and enter a user name and password, a credit card, or an account number, which will then be hijacked. In the latter case, it seems that this is being done solely to generate ad revenue," Intego reports.

Intego reports, "Under Mac OS X 10.4, there is no way to see the changed DNS server in the operating system’s GUI. Under Mac OS X 10.5, this can be seen in the Advanced Network preferences; the added DNS servers are dimmed, and cannot be removed manually. (Intego is currently testing previous versions of Mac OS X; it is likely that they can be infected as well, since all versions of Mac OS X have the scutil command.)"

Intego reports, "The Trojan horse also installs a root crontab which checks every minute to ensure that its DNS server is still active. Since changing a network location could change the DNS server, this cron job ensures that, in such a case, the malicious DNS server remains the active server."

"This Trojan horse also provides different versions of itself, perhaps according to the country in which the user is located to provide country-specific spoofing. Repeated downloads of the disk image show that there are several different versions," Intego reports.

MacDailyNews Note: Of course, Intego says that "the best way" to protect against this exploit is to purchase and run Intego VirusBarrier X4 with up-to-date virus definitions, but we suggest that an even better way to protect against such trojans is to use your head and not download, authorize, and install software from porn sites.

[Thanks to MacDailyNews Reader "RadDoc" for the heads up.]

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Oct 31, 07 - 02:46 pm Comment from: B Real

I love how this statement implies Intego customers look at porn....perverts!! jk jk

Oct 31, 07 - 02:46 pm Comment from: Scott

Sadly this will effct an abnormal amount of Mac users since most at between the ages of 18 and 35 and are male.

Oct 31, 07 - 02:46 pm Comment from: Grigori

Oh, come on - everybody knows Mac users NEVER visit porn sites.

Oct 31, 07 - 02:51 pm Comment from: bigboy

Wonder which porn sites these are just so I would could take a closer look and make sure I don't fall into this trap! smile

Oct 31, 07 - 02:51 pm Comment from: Fatty Arbuckle

Just wait for the mainstream press, Dvorak, Enderle et al to spin this as meaning Macs are just as vulnerable is PCs. I cringe just thinking about it...

Oct 31, 07 - 02:54 pm Comment from: Mauritius Kestrel

If a Trojan makes you hoarse, you're doing it wrong.

Oct 31, 07 - 02:56 pm Comment from: Ballmer

"Oh, come on - everybody knows Mac users NEVER visit porn sites."

Sure, the kids are protected by the (no, not the infamous new firewall), but the parental controls in Leopard

Oct 31, 07 - 02:56 pm Comment from: Grrrilla

Time to sell all your AAPL stock! This could take it to pre-OS7 levels.

Oops! Did I say that out loud?

Oct 31, 07 - 02:57 pm Comment from: darkalias

Finally some use for Leopard Parental Control grin

Oct 31, 07 - 02:57 pm Comment from: The Mac That Roared

Ummm...yeah, like I'm gonna willingly install software that I didn't intend to download

Oct 31, 07 - 02:57 pm Comment from: YimmieT

Anyone who is stupid enough to do this to themselves deserves it.

Oct 31, 07 - 02:57 pm Comment from: Ron Jeremy

Damn it my mac crapped out....

Oct 31, 07 - 02:59 pm Comment from: OldMacFan

There is never a reason to install a codec from a website; ever...

Duh...

Oct 31, 07 - 03:00 pm Comment from: REalityChEck

This one seems plausible.

Oct 31, 07 - 03:06 pm Comment from: Danno Bonano

Best quote in a while MDN! Laughed my arse off!

"but we suggest that an even better way to protect against such trojans is to use your head and not download, authorize, and install software from porn sites."

Oct 31, 07 - 03:10 pm Comment from: Jim - TIV

Wonder how long it took RadDoc to get his mac back up and running?

;-p

Oct 31, 07 - 03:10 pm Comment from: Pron

porn / ms

in together to hack the Mac.


I am glad QT doesn't work with their sh_t.
And can't bother to add new codecs which I have no clue on managing.

So being on a mac is like using a condom.

Oct 31, 07 - 03:12 pm Comment from: Hg Wells

MDN, I would say that the best way to protect against this IS to install Intego's VirusBarrier. There are many computer users who don't understand when to enter their password since they are asked so much for it. It's like reading the license agreements. People just click by it. Many who are still not comfortable with computers (I know many older people like that) need something for protection. Intego is correct and their software is good. I also prefer NetBarrier to many of the options. Intego got a bad rap a few years back for handling something poorly. But they are going strong now and I think it is wise to have some background protection on the Mac for a time when something might sneak up on us.

Oct 31, 07 - 03:12 pm Comment from: Jim I was up and running again in 10 mintues

COS OSX RULES

Oct 31, 07 - 03:13 pm Comment from: zox

Difficult to believe, that anyone would use their administrator’s password to say "sure install whatever a porn site suggests..."

No matter how secure an OS, still can't stop the user from silly

Oct 31, 07 - 03:19 pm Comment from: Demon

As a security researcher, this is most likely a case of FUD and an attempt to drive sells for their software. The Trojan that he is describing is a common Windows DNS hyjacker. Not saying that one could not be created for the MacOS. It's just not very likely and I've looked at thousands of Trojans from Porn Websites in the past few weeks and have not found one yet that is targeting the MacOS (Windows IE 6 and IE 7 and even Vista).

I'd take any claim that a company that sells software to protect against such things with a huge dose of salt. Until independent conformation is made in public, I'm sceptically.

Oct 31, 07 - 03:25 pm Comment from: Wallace the Man

And so how do you get rid of it once it is in your computer????

Oct 31, 07 - 03:27 pm Comment from: Predrag

OK, porn users, pay close attention: be careful what you install, or you may catch something bad.

All others: don't worry, your Mac is as safe as ever.

Oct 31, 07 - 03:31 pm Comment from: Hg Wells

Demon, Rob Griffiths at MacWorld did some looking into this and seems convinced that this is legitimate. Unless new facts emerge, I doubt this is FUD. And of course a security firm will promote its own software. When you go to a car dealer, you expect them to promote their own cars. But you also expect information on their cars that you can't get elsewhere. OK. Maybe cars is a bad example, but the point is that people in the field will give you information you sometimes need. So to disregard Intego (or any other legitimate company) is not always advisable, IMO. And what's the problem anyway having some virus and other protection on the Mac? Are you trying to keep Macs clear of such things because your new career is in writing malware?

Oct 31, 07 - 03:34 pm Comment from: Hg Wells

Wallace the Man, look here:
http://www.macworld.com/2007/10/firstlooks/trojanhorse/index.php

Oct 31, 07 - 03:36 pm Comment from: Virus

Symantec are feeling snappier now...

Oct 31, 07 - 03:37 pm Comment from: Peter

"Sadly this will effct an abnormal amount of Mac users since most at between the ages of 18 and 35 and are male."

But wait! I thought all Mac users were gay! Why would they be interested in heterosexual pornography?

Oct 31, 07 - 03:42 pm Comment from: ricandterri

MDN which head were you talking about?

Oct 31, 07 - 03:44 pm Comment from: matt Screen

Such rubbish. Mac users don't look at porn sites. They are too busy creating content and authoring sites.

Oct 31, 07 - 03:47 pm Comment from: Masa

Installing "a codec" from a porn site is one of the dumbest things you can do. Macs have locks on the doors, but if the user is a moron...

I bet there will people who will install this, and if they learn not to trust everything and everyone - good for them, if not - ...well, nature eliminates weak and dumb.

Oct 31, 07 - 03:48 pm Comment from: Gabriel

from Hg Wells: "MDN, I would say that the best way to protect against this IS to install Intego's VirusBarrier. There are many computer users who don't understand when to enter their password since they are asked so much for it."

In my experience, I am VERY rarely prompted for my administrator password, and I darn sure click "cancel" if I'm not explicitly authorizing an install. If your Mac is imitating Vista and nagging you every few minutes for your administrator password, you already have a problem.

Oh, and I didn't realize the venerable Mr. Wells was shilling for Intego. Royalties from his books must have dried up. wink

MDN magic word: "few" - as in, there are so few deceased authors you can trust these days. wink

Oct 31, 07 - 03:50 pm Comment from: Logan

Who said it was hetero?




MW= "bed" (do they do that on purpose?)

Oct 31, 07 - 03:52 pm Comment from: hmciv

A trojan for Macs? AAAAAH! We have to save ourselves! EVERYBODY RUN!!! SWITCH TO VISTA!!! S-W-I-T-C-H T-O V-I-S-T-A-A-A-A!!!!

Oct 31, 07 - 03:57 pm Comment from: Tom Ferguson

"If the user then proceeds with installation, the Trojan horse installs; installation requires an administrator’s password, which grants the Trojan horse full root privileges“

WRONG! It will only give the Trojan ADMINISTRATOR privileges. Unless you know how to use the command line you can’t get root privileges.

Oct 31, 07 - 04:02 pm Comment from: DJ

Gosh, porn sites... hmmm, never go there.

Seriously, anyone who downloads from such sources deserves a good kicking (with leather and high heels of course).

Ahem, I'm not sure the emoticons work, so try this -- :-O

Oct 31, 07 - 04:11 pm Comment from: H.P. Lovecraft

Methinks HG Wells works for Intego.

Oct 31, 07 - 04:12 pm Comment from: Big Al

There they go. Safe porn surfing was the number one reason to switch to a Mac.

Watch the Mac market share disintegrate now.

Buy Dell shares ASAP.

Oct 31, 07 - 04:12 pm Comment from: JadisOne

Wow. A non-theoretical trojan. But it still requires the user to do things as opposed to the automatic stuff that happens with Windows. Nonetheless, one should surf carefully.

Oct 31, 07 - 04:12 pm Comment from: bIzarRo BalLmeR

@Peter

You beat me to it...mac users are safe since the malicious site it for heterosexuals..and we all know mac users are gay...
wink

Oct 31, 07 - 04:18 pm Comment from: Scott

@Peter and BalLmeR

They never specified the type of porn sites. smile

@Pron

So now looking at porn you can catch something, and if you have sex you can catch something. Now that is a delimia.

Oct 31, 07 - 04:19 pm Comment from: Hg Wells

No, H.P. Lovecraft, Hg Wells does not work for Intego. If you check other forums where Intego has been discussed in recent months, you'll see similar takes. So, would it be your preference to have nothing extra installed on the Mac (saving money)? Or do you have another security company whose software you prefer?

Oct 31, 07 - 04:19 pm Comment from: Not fair

Well the least they could do is list the names and URLs of the websites in question. Not that I want to go there, or anything, but to be sure I could avoid them. Yeah, that's it, avoid them!!!!

Magic word "shown", as in "what would we have been shown if we had gone to one of these sites?"

Oct 31, 07 - 04:26 pm Comment from: bwaha

This is why I use either MPlayer or VLC for my viewing pleasure, not Quicktime tongue wink

Oct 31, 07 - 04:26 pm Comment from: ibookfast

Hey Fatty, apparently hell is freezing over 'cause on TWIT this week Dvorak actually is advising people to choose Mac. He's also saying he thinks Ballmer/MicroSoftie is nuts trying to compete with Google selling ads. Microsoft is losing focus and it shows.

Oct 31, 07 - 04:28 pm Comment from: MacSmiley

I checked the link above for the MacWorld article by Rob Griffiths. Remember that Rob was one of the writers who exposed the Leap A/Oompa-loompa Trojan as a wimpy badly-written piece of code.

His tone this time around is A LOT different:

"This is really bad. Really. And even though it’s targeted at porn surfers today, the malware could easily be associated with anything else... Because this thing may spread to other such sites, we spent some time investigating the trojan—no, not its source sites!—to determine the best way to tell if you’ve been infected, as well as how to remove the software if you do find it on your machine."

You might wish to bookmark this article just in case. Also, let's hope ClamXav is updated soon as well to ID this nastyware.

Although theOSX.RSPlug.A Trojan Horse is not a virus, it is serious!!

Laughing at this Trojan is not the appropriate response this time around.

MDN MW = united

So let's be united as Mac users in helping us protect one another from real security threats.

Oct 31, 07 - 04:34 pm Comment from: matt

what's to stop some other scammers/assholes to implement this in a more legitimate site - say, a spoof of apple's quicktime page?

one could argue that nobody should visit porn sites and do a download - that's common sense, which, sorry to say guys, even some mac users don't have. but if you click a link and it looks like apple's site and says it's installing a quicktime updater, someone who might not know that macs don't usually update like that wouldn't think twice about clicking.

this is a serious issue and hopefully apple will patch it up soon. we can all still take joy in knowing that our platform has far less malicious software on it than windows. =)

Oct 31, 07 - 04:36 pm Comment from: matt

oh, macsmiley just basically said what i just did. heh

Oct 31, 07 - 04:45 pm Comment from: Macjammer

Hmm..being a creative Mac user I suppose I'd either be the porn star gettin' some pom pom in and being paid lots of $$$, then again be a porn video director - as if direction is required??

On a serious note I'd like to hear more about this Trojan affecting Macs and from an independant source. Not to say anything is wrong with Intego, after all most anti-virus software developers have been saying this for years.

They would wouldn't they, its their business to scare computer users into buying 'extra protection' against infectious diseases?

It is up to each of us if we want to take heed, luckily for us Macheads we don't have to - pity the poor Windows user who has to take heed or get infected and die.

Oct 31, 07 - 04:47 pm Comment from: clyde

Damn, now I'll have to get a linux box to view porn. Damn.

Oct 31, 07 - 04:51 pm Comment from: DV

What is the sound of one hand typing on a mac?

Oct 31, 07 - 04:59 pm Comment from: Macjammer

Ohh..on the subject of spoof websites mentioned above, it doesn't matter if you're a Mac user, Windows user or Linux user as those types of emails & websites made to look genuine are more related to identity theft. PayPal is a case in question, I happen to think they've been the most spoofed brand of Internet based businesses ever!

For emails it doesn't take much effort to delete such scams from your inbox as the email always looks too good to be true, so it probably is, how often do people actually win the Minnesota lottery for instance (let alone I'm 5,000+ miles away from Minnesota) through not having even entered into the draw and get an email saying I've won???

On the Mac side Micheal Tsai's SpamSieve works perfectly for me after a short period of training it to 'sieve' out spam emails with dubious spoofed websites usually provided to catch out the unwary.

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