MobOk Malware

Researchers discovered a fake photo editing apps which are used by cybercriminals to launch MobOk Malware that takes complete control of the infected Android device.

Threat actors are targeting Android users through legitimate Google play store app and hiding this malware to steal money by letting users subscribe to premium services.

Two photo editor apps were uncovered ‘Pink Camera’ and ‘Pink Camera 2’  which has been installed nearly 10, 000 times.

These apps were intended for uploading in the Google play store to steal personal data from victims Android device and use that to sign them up to paid subscription services.

Researchers described this MobOk malware as a powerful backdoor since it has sophisticated capabilities to take almost complete control over the infected Android device.

Developers of this Pink Camera apps added evasion techniques to hide suspicious activities and avoid detection. The apps included a genuine photo editing functionality, and the users completely believe it since the app downloaded from the Google Play Store.

Once the app will be installed into the victims mobile, it requests to grant permission for the notification from the user and perform malicious activities in the background.

The primary motivation of these apps has subscribed the user to paid mobile subscription services.

MobOk Malware Infection Process

After the complete infection, MobOk malware starts collecting the device information, including phone number and the attackers send the webpage for the premium subscription, which requires users to pay for the service.

Meanwhile, The malware will open a secret browser in the background, and it uses the victim’s phone number that was already collected and the Malware would insert it into the “subscribe” field and confirm the purchase.

Examples of “subscription” pages

MobOk Malware already had complete control of the victims mobile, it grabs the SMS verification code notification and enters it on behalf of the user.

According to Kaspersky research, “The Pink Cameras’ photo editing capability was not very impressive, but what they could do behind the scenes was remarkable: subscribing people to malicious, money-draining services in Russian, English and Thai, monitoring SMS and requesting Captcha – the code that you need to write down to prove you are not a robot – recognition from online services. 

By look and working wise, both apps are very ordinary, but the malicious activities start when it is seeking permission for various controls such as to request access to Wi-Fi controls which is entirely unusual for this apps.

“While users upload the phone into the app to edit the app collects information in the background about the device and sends it to the server ps.okyesmobi[.]com,” Kaspersky reported.

Indicators of Attack

SHA256

  • 7F5C5A5F57650A44C10948926E107BA9E69B98D1CD1AD47AF0696B6CCCC08D13
  • E706EB74BAD44D2AF4DAA0C07E4D4FD8FFC2FC165B50ED34C7A25565E310C33B
  • 796A72004FAE62C43B1F02AA1ED48139DA7975B0BB416708BA8271573C462E79
  • C5CA6AA73FDCB523B5E63B52197F134F229792046CBAC525D46985AD72880395
  • B9038DC32DE0EA3619631B54585C247ECFD304B72532E193DED722084C4A7D1C
  • D4406DEE2C0E3E38A851CEA6FD5C4283E98497A894CA14A58B27D33A89B5ED5F
  • 59D64FBFF1E5A9AC1F8E29660ED9A76E5546CA07C2FF99FE56242FA43B5ABEC3
  • C5B6146D7C126774E5BB299E732F10655139056B72C28AA7AD478BD876D0537E

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