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Trojan.Triosir.9

Added to the Dr.Web virus database: 2014-08-15

Virus description added:

Trojan.Triosir.9 is a plug-in for web browsers designed to display annoying advertisements to users as they browse webpages. From May 2014, this malicious program has been distributed through an affiliate program called Installmonster. Trojan.Triosir.9 is created by Trioris.

One of its modifications is distributed as the VK User Spy plug-in that can supposedly allow users to stealthily view Vkontakte (“ВКонтакте”) messages. This plug-in is presumably developed on the basis of a legitimate browser extension called VKSpy. Cybercriminals even left the names of real application's creators (Evgeniy Zinoviev and Ivan Gusev) in \ldognehopalabhkhpeeedfdeeedfhchg\3.1_0\_locales\ru\messages.json unchanged:

{
   "about": {
      "message": "О приложении"
   },
   "about_ez": {
      "message": "Евгений Зиновьев"
   },
   "about_ig": {
      "message": "Иван Гусев"
   },
   "ago_hour_format": {
      "message": "%s назад"
   }

During installation, the system registry is checked for the presence of already installed Trioris applications, including Get-Styles, desktopy.ru, screeny.ru, and other applications. If any of them is detected, installation is aborted. While the malicious program is installed, it connects to the command and control server and uses a list of keywords and properties to determine what websites should not display advertisements and what websites should.

Cybercriminals added a string to the content.js file's code of the original VKSpy plug-in. The string calls the stat.js script that downloads ursp.js. This script, in turn, downloads two additional scripts which generate advertising modules.

screen

The Trojan displays advertisements on top of webpages browsed by the user. The window with an advertisement has a special button by clicking which the user can close the module. Moreover, there is a sign that says “Powered by VkUserSpy”; at that, the name of the product is first specified in the ursp.js script (in the window._rw_pr_n = "VkUserSpy" variable) and is subsequently used by other scripts.

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

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