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Trojan.InstallCube.339

Added to the Dr.Web virus database: 2015-08-23

Virus description added:

SHA1: df17d83d81b8d2e3b45cf0759d29fdd5340bdfe4 (packed)
8c26ac74112c633ffda72752c2d1c25e37b24e40 (unpacked)

A malicious program designed to install other applications on the infected computer without user knowledge. When packed, the Trojan is about 3.5 MB in size; when unpacked, its size is 400 KB. The executable file is linked to MSVCP60.dll and MSVCRT.dll.

Once launched, the Trojan replicates itself to the memory. Prior to running, its parameters are updated with command and control server addresses.

After that, the Trojan starts gathering information about the infected computer (OS version, computer name, user name, and so on) saving it to the structure in JSON format (JavaScript Object Notation). Subsequently, this data structure is used to retrieve a configuration file. Command and control servers allow Trojan.InstallCube.339 to download the payload only if the infected computer has a Russian IP address. While connecting to a command and control server, the Trojan displays the load indicator and, after that, demonstrates a dialog with information on the downloaded object. At that, the dialog supposedly belongs to the well-known mTorrent application.

screen

If the user clicks the hardly visible Settings link at the bottom of the window, the Trojan will display the list of additional programs to be installed on the compromised computer.

screen

However, if the user clicks Save (“Сохранить”) in the previous dialog, then all the additional components will be downloaded together with the chosen file. Once Trojan.InstallCube.339 preforms its task, it removes itself.

Communication with command and control servers is carried out using User-Agent: "IC Loader 4.2.2". To initiate the connection, Trojan.InstallCube.339 sends the getToken request to the server and gets GetSettings as a reply. Once the GetSettings command is executed, the Trojan sends the server the ReportStart request. In reply, it receives data on affiliate software to be downloaded.

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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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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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.

Find out more about Dr.Web for Android

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