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Added to the Dr.Web virus database: 2016-10-21

Virus description added:


  • afecbbc9d6dbc326fa448674b7b252c05e3c0c9b - BackDoor.Crane.1
  • 33817963d25d8bf45bbaf8c09e6e82a26532b4e3 - CmdModule.dll
  • 61e7f7a02d8b63af4b3738ca6086a442a4a72359 - DownloadModule.dll
  • 5596a021c1a7532c876c13bf0645b863b322cf84 - FilelistingModule.dll
  • 96ca14351bd7e34536b0cd945c3d952bfb0a5f6d - ScreenshotModule.dll
  • 3aa2c53361d79172c0f6e8a57fad7f9f14667bf2 - UploadModule.dll
  • 6a1d24439c15aa559b34e411f2f52d8fb564dba1 - UploadToAdminModule.dll

A modular backdoor used by cybercriminals to carry out targeted attacks on largest Russian companies producing portal and lifting cranes as well as auxiliary equipment. It is written in C++. The last compilation of the examined sample is Thu Apr 21 10:56:19 2016. The path to debug information:


Once launched, the Trojan creates a separate thread to perform its malicious activity. It then checks the configuration file connfig.jsonin the catalog “%ALLUSERSPROFILE%\\yandex_service”. If the file is found, the Trojan gets necessary data from it. If not, the Trojan creates this file with a default content:

    "frequency" : 60,
    "id" : "*******",
    "proxy" :
        "host" : "",
        "pass" : "",
        "port" : 0,
        "protocol" : 0,
        "user" : ""
    "script_name" : "***.php",
    "servers" :
            "host" : "*****.**",
            "port" : 80,
            "useSSL" : false

After a name of a folder is determined, the Trojan searches its own modules scanning files by their masks:

 < dir>\\modules\\*Module.dll

Found modules are then loaded to the memory using LoadLibrary. Meanwhile, the Trojan checks that the library has the exports GetModuleName, GetModuleCommand, CreateModule, DeleteModule, and RunCommand.

Once the modules are loaded the Trojan periodically requests to the C&C server for further instructions. First, it registers on the server and sends information about an infected computer: its name, a user name, an IP address, a list of the running processes, and a randomly generated bot identifier. It should be noted that, while sharing data with the server, the Trojan uses the string “RSDN HTTP Reader” as a value of the parameter User-Agent.


As a response to this request, the server sends the confirmation:


The Trojan then awaits for instructions after sending GET requests. The server’s replies are in the JSON format:


This example shoes that the field “data” does not contain information, so that the bot does not need to execute any commands. When sending a command, the field “data” has the following structure:

    "id": <bot_id>,
    "command": {
        "command": <command_name>,
        "cmd": {
            "wait": true

where <bot_id> corresponds to the bot’s identifier, <command_name> is name of a command or a module for which the command is intended. The Trojan can execute only one command—“updateConf”—that updates the configuration file. Other commands are executed by the modules.


All the modules are named *Module.dll, located in the directory “<dir>\\modules\\”, and has the exports GetModuleName, GetModuleCommand, CreateModule, DeleteModule, and RunCommand.


It creates the structure st_module and returns the pointer on it:

struct st_module
  char * name;
  char * command;


It returns the field “name” of the structure st_module.


It returns the field “cmd” of the structure st_module.


Clears the memory used for creation of the structure st_module.


Executes the specified command.


The path to debug characters: C:\Users\User\Desktop\14\bin\modules\CmdModule.pdb

name: "CmdModule"
command: "cmd"

IT executes the command using the command interpreter cmd.


The path to debug characters: C:\Users\User\Desktop\14\bin\modules\DownloadModule.pdb

name: "DownloadModule"
command: "download"

It downloads a file from a specified link and saves it to a certain folder on a computer.


The path to debug characters: C:\Users\User\Desktop\14\bin\modules\FilelistingModule.pdb

name: "FilelistingModule"
command: "filelisting"

It generates a list of folder content and sends to the C&C server.


The path to debug characters: C:\Users\User\Desktop\14\bin\modules\ScreenshotModule.pdb

name: "ScreenshotModule"
command: "screenshot"

It takes a screenshot and sends it to the C&C server.


The path to debug characters: C:\Users\User\Desktop\14\bin\modules\UploadModule.pdb

name: "UploadModule"
command: "upload"

It loads a file to a specified server over the FTP protocol.


The path to debug characters: C:\Users\User\Desktop\14\bin\modules\UploadToAdminModule.pdb

name: "UploadToAdminModule"
command: "uploadtoadmin"

It loads a file to a specified server over the HTTP protocol.

News about the Trojan

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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Download by serial number

  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