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"SMSZombie" Malware Infects 500,000 Android Users In China

wiredmikey writes "Researchers have recently discovered a new sophisticated and resilient mobile threat targeting Android phones that is said to have infected about 500,000 devices, mainly in China. Called 'SMSZombie,' the malware is stubborn and hard to remove, but users outside of China have little to worry about with this latest discovery. The prime function of the mobile malware is to exploit a vulnerability in the mobile payment system used by China Mobile, making it of little value to the fraudsters outside of China. The malware takes advantage of a vulnerability in the China Mobile SMS Payment process to generate unauthorized payments to premium service providers, and can also remotely control the infected device. It has been spread via wallpaper apps that sport provocative titles and nude photos, and can only be removed using a lengthy process beyond the skills of a typical android user."

24 of 116 comments (clear)

  1. Re:"Lengthy Process" by Thantik · · Score: 4, Insightful

    In addition to removing it from device administrators. Which is like 2 actual steps. It's very tame compared to what it _could_ take.

  2. SMSJiangshi by Hsien-Ko · · Score: 2

    We're not zombies!

  3. Obvious scam by vlm · · Score: 2

    wallpaper apps that sport provocative titles and nude photos

    How can someone see that and not realize its gotta be a scam?

    Probably just as effective as putting up a "idiots click here please".

    The ability to be scammed is hardly limited to senior citizens.

    --
    "Science flies us to the moon. Religion flies us into buildings." - Victor Stenger
    1. Re:Obvious scam by mlts · · Score: 5, Interesting

      You would be surprised how easy it would be to get stung by this by an average user [1].

      A couple months ago, I was browsing for a couple games. Looked at the game, and it demanded every right under the sun. Of course, it didn't get the second install click.

      However, it was a game with an icon that was the logo for a popular game show, so it looked "legit" enough to a user. Most Android users are not the top tier IT people who know exactly what an app should and should not be doing. They tend to see an app, tap it, and go from there.

      All and all, the Android permissions are working fine. The app couldn't do much to hide in the system, so someone removing the device admin and then the app resulted in a cleanup. Had the app had root, it could insert itself into a lot more places.

      The problem is that whomever is the curator of the app store [2] in question. There really needs to be at least two tiers with some warning about entering into Mordor for the second tier. Android needs to have default stores like Amazon's that apps are vetted to a strict code before they hit the store. Not just checked with a scanner like the Bouncer, but put up to a higher tier of rules than the free-for-all of the present Google Play store. The reason for the higher standard is to minimize the "developer banned at 9:00, app is back in the store at 10:00 under a different name", which was not uncommon.

      Android is great (and it can be argued that the OS is more secure than iOS when compared side to side [3]); it just needs a beefy gatekeeper enforcing a proper dress code. iOS's security would be significantly weakened without an active gatekeeper, and Apple has done a good job at keeping the nasties out of the Apple ecosystem.

      [1]: The Dancing Bunnies "hole" has defeated many security systems.

      [2]: I wasn't sure if it is Google or what, so using "app store" as a generic term. App Store would likely mean Apple's offering.

      [3]: iOS depends on the "jail" system completely. A rooted Android device does not lessen any security, unless the user decides to let an app through via "Superuser" that shouldn't have root.

    2. Re:Obvious scam by queazocotal · · Score: 2

      Then there is the side-effect of ads meaning that _EVERY_ app (well, the majority) has all the permissions it needs to start scanning your network at 3AM, and reporting what it finds back to china.
      Fixing this would not be that involved, but it would mean that there is some cost.
      Devs would need to write a one-line explanation for every permission.
      You'd need to have someone slightly clueful to see if all the permissions are in fact required for the features mentioned.
      This is around a 2 minute task for most apps.
      Restricted versions of some permissions would be needed - for example if an app wanted ads, it can get them from the internet, but only from one address (whos reverse DNS must resolve to the same host).

  4. So... by jamstar7 · · Score: 3, Funny

    THIS is the dreaded Zombie Apocalypse we're constantly warned about??

    --
    Understanding the scope of the problem is the first step on the path to true panic.
  5. Re:"Lengthy Process" by snowraver1 · · Score: 2

    I was expecting something like an os reinstall or something... Those instructions seem simple and straightforward.

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  6. Lengthy Process? by rudy_wayne · · Score: 4, Funny

    can only be removed using a lengthy process beyond the skills of a typical android user.

    The "lengthy process" consists of:

    Go to System Settings >> Location and Security >> Select Device Administrators
    Remove "Android System Service"
    Go to System Settings >> Applications >> Manage Applications >> Android System Service
    Choose "Uninstall"

    OMG!!!

    4 steps!!!!!! It's so complicated!!!!!!!!

  7. Re:"Lengthy Process" by stephanruby · · Score: 2

    In addition to removing it from device administrators. Which is like 2 actual steps. It's very tame compared to what it _could_ take.

    Yes, since they're a "security" company, they're taking the Norton approach and making the instructions as scary and as lengthy as they could make them.

    First of all, if the device is under a device administrators' control, I doubt very much that the phone would have gotten infected in the first place. And second of all, I can understand the normal Chinese grandma not understanding the instructions:

    "Just uninstall the 'naked girls' application, there is nothing more to it than that. "

    But at the very least, this one instruction should be more than enough for a device administrator to know what to do. And it should also be more than enough for the Chinese grandfather who originally installed the 'naked girls' application in the first place and who knew enough about his phone to enable the "allow applications from unknown sources". So making two different sets of instructions, one for the administrator and one for the user, and hiding them between one more level of links on the web site, is only making it seem more difficult than it really is.

    Also, I'd love to know where they got "that is said to have infected 500,000 devices", they don't quote anyone actually saying that. One can only assume this is a figure that the "Security" company itself made entirely up, based on what? they don't actually say.

  8. Re:"Walled garden"? by fuzzyfuzzyfungus · · Score: 5, Insightful

    Apple is quite lucky that that nobody ever weaponized anything back in the good old days of Jailbreakme... In-browser TIFF exploit leading to full root access just by loading a web page.

    Google, of course, is similarly lucky that nobody bothered to do anything wacky during the "yeah, everything you type gets silently dumped to a root shell, why do you ask?" period in early android...

    Punchline is, the state of 'mobile' security(really, security in general) is pretty fucking dire, and the current frenzy to tie as many payment systems as possible to mobile phones is complete insanity, except from the perspective of the bottom lines of the respective payment processors, naturally.

  9. I was going to... by VTI9600 · · Score: 2

    ...post a lenghty rant about miscoceptions of Android users, and quote the OP too. Unfortunately, I'm posting from an Android device and do not posess such skills.

  10. Re:But Android is Open !!! by JAlexoi · · Score: 2

    open to trolls, as well.

  11. Re:But Android is Open !!! by PNutts · · Score: 2

    In a story about fraud on the Android platform someone points out that Android is open to fraud. Personally, I think it was a play on words and not a technical comment. Either way, I don't think the word troll means what you think it means. If you thought they were serious you could have explained why they were wrong and help keep this a useful technical forum. And I want a pony.

  12. Re:"Walled garden"? by 93+Escort+Wagon · · Score: 4, Interesting

    Amazon apparently still needs to learn this, given the recent Kindle Touch remote root exploit.

    --
    #DeleteChrome
  13. Re:"Walled garden"? by Shoten · · Score: 5, Insightful

    Sorry guys, but he's got a point. The attack vector here is an app that people voluntarily run, and the walled garden has been effective against that. Are there other vectors? Yeah. But that doesn't mean that his point about this one vector is wrong...it's not wrong at all. It took 5 years for the first malicious app to slip past Apple, and even then, the nature of how it all works meant Apple could remove it from everyone's iPhone with a single update. Android can't boast the same, either on the prevention or the remediation side. I don't hold any hate for either side, but this is just simple truth we're talking here. There have been scores of trojaned Android apps, and many for jailbroken iPhones as well...but only one, ever, for standard iPhones.

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  14. Re:"Walled garden"? by AK+Marc · · Score: 3, Interesting

    Because capitalism is inherently anti-free market. In free market capitalism, we'd have processors coming in at cost + small% to do the same thing. Instead, we have monopoly based economics, with Visa/MC having a vast majority of the business, and network effects that keep out most competitors. So the price for the service is based on profit maximization, not revenue maximization at a minimum profit level.

    I've seen a $200 box with a patent sell for $50,000+ because the "value" was $50,000 plus, but the patent was obvious and not novel (It was essentially signal cancellation for an expensive piece of communications gear, with court cases about it because two companies patented the same thing at the same time, both valid because the patent office isn't technical enough and the filing periods overlapped so neither was granted before the other was filed, so not previous art for the other).

  15. Re:"Walled garden"? by Anonymous Coward · · Score: 2, Insightful

    I'm not sure I agree with you, at least for iOS. Security was dire around v1.0, but now we're at 5.x going on 6.x and a lot has changed.

    iOS is definitely more secure than Mac/Windows/Ubuntu.

    There is always room for improvement, but iOS has sandboxing and code signing and full disk encryption with a hardware only encryption key derrivation algorithm, that is deliberately slow, providing a private key that can be erased remotely or after a few failed decryption attempts.

  16. Re:"Walled garden"? by Shoten · · Score: 2

    Yep. That is the one malicious app.

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  17. Re:"Walled garden"? by dudpixel · · Score: 2, Interesting

    From the article:
    "According to TrustGo, the malware is being spread through online forums and has been found in several packages on China’s largest mobile app marketplace, GFan"

    Better revise your "attack vector" description.

    Most Android users only use Google Play Store, which not only is not known to be affected by this malware, it also has the ability to remove it from users' phones after the fact - so you're wrong there too.

    You even admitted there is malware for 'jailbroken' iphones, which would be a more direct comparison here.

    Android likely has more malware potential, but this specific attack isn't a problem for those who stick with Google Play Store. Those who use alternative stores should understand the risks (or in fact, anyone using technology such as the internet should understand the risks).

    --
    This seemed like a reasonable sig at the time.
  18. Sophisticated? by Anonymous Coward · · Score: 2, Interesting

    The "Wallpaper" trojan has to get administrative priviledges from the user. Social engineering trick.

    Then it downloads the malicious code. Not impressed.

    Finally, it monitors keystrokes. Key logger anyone?

    Is it just me, or does the company (TrustGo) that called this malware "Sophisticated" have an ulterior motive? Care to purchase a mobile security product?

    http://www.trustgo.com/en/

  19. Re:"Walled garden"? by BenJury · · Score: 2

    Did you read the article? You download the app from whatever store, then it downloads a second file which it then installs as a 'driver' which does 'bad things'. The user is prompted if they want to install it, but the box just reappears if you hit no. That would be hard to detect from which ever store it was posted to.

    Obviously the fact that a downloaded wallpaper can install this 'driver' is wrong and needs to be looked at.

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  20. Re:"Walled garden"? by hawkinspeter · · Score: 2

    That doesn't sound like full disk encryption - they're only protecting "data at rest". I'm also concerned that a user's device passcode wouldn't have enough entropy (never mind the ease with which you can shoulder surf an iPhone user).

    --
    You're a temporary arrangement of matter sliding towards oblivion in a cold, uncaring universe
  21. Re:"Walled garden"? by Shoten · · Score: 2

    I don't think you understand what a tethering app really is. It's not something that researches launch to clean up other malware. It's something that allowed you to use your iPhone as a hotspot, before any of the cellular providers had permitted it (at all). Back in the days when unlimited data plans for iPhones were somewhat common, this was seen as a problem by the cellular providers. People didn't download the flashlight app and say "Ah, surprise! My phone is doing something malicious!" Nothing malicious at all was happening. The "mal" in "malware" doesn't come from virus writers' love of Firefly's lead character...it stands for "malicious," and the people who downloaded the app knew exactly what they were getting, and wanted that functionality. Even the articles that refer to that app do not call it malware.

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  22. Re:"Walled garden"? by fuzzyfuzzyfungus · · Score: 3, Insightful

    In the context of this article, it's probably worth noting that(even if the iPhone feature described works exactly as advertised) it is aimed at mitigating a completely different class of attack.

    Disk encryption setups aim to protect a lost or stolen device, in the physical custody of the attacker, from revealing whatever information is on the disk. They have no effect when the device is on and operating under the user's credentials(transparency is considered a feature).

    This attack in China is an attack on a live system, using the credentials of the user(or higher) to perform malicious operations as them. Even if the disk were encrypted in a suitably robust way, it'd be happily handing over whatever this bug asked for.