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Added to the Dr.Web virus database: 2014-02-14

Virus description added:

A Trojan that infects ATMs of one international manufacturer that are used by various banks in Russia and Ukraine. The Trojan's main payload is incorporated into a dynamic-link library stored in the NTFS stream of the following infected file: C:\WOSASSP\BIN\FWMAIN32.EXE.

If NTFS is used in the compromised system, Trojan.Skimer.19 also stores its logs in data streams as follows:
%windir%\desktop.ini:userA—transaction log (bank card tracks and encrypted PIN blocks),
%windir%\desktop.ini:userB—log on intercepted keys that are used to decrypt PIN codes.

If another file system is used in the compromised system, logs are saved to the following files:

Once the ATM's OS is infected, Trojan.Skimer.19 starts monitoring Encrypted Pin Pad (EPP) keystrokes waiting for a specific input combination that can initiate the execution of a command entered by a cybercriminal via EPP. This can be possible only if cybercriminals possess a special master card. The malicious program can execute the following commands:

  • Save the log files on the cards chip, decrypt PIN codes.
  • Remove the Trojan's library and log files, “cure” the host file, and reboot the system (cybercriminals issue the command to the infected ATM twice; the second command comes no later than 10 seconds after the first).
  • Display statistics including the number of transactions, bank cards, intercepted encryption keys, and so on.
  • Delete all log files.
  • Reboot the system.
  • Read the executable file from the card's chip to update the Trojan.

To decrypt intercepted data, Trojan.Skimer.19 uses the software installed on the ATM or its own version of the DES symmetric-key algorithm and encryption keys that were intercepted and saved into the userB log file earlier.

News about this threat

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.

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