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Trojan.Encoder.252

Added to the Dr.Web virus database: 2013-07-11

Virus description added:

A malicious program belonging to the family of encryption ransomware Trojans that encrypt files and demand a ransom for decryption of compromised data.

The malware can be distributed via targeted mass mailing with attachments. Once the Trojan is launched on the infected computer, it saves its copy under the name of svhost.exe in a system folder, modifies the system registry branch that manages the autorun list, and then runs the saved copy.

Trojan.Encoder.252 encrypts files only if there is an established Internet connection. First, the malware searches all hard drives for files with the specified extensions (.jpg, .jpeg, .doc, .rtf, .xls, .zip, .rar, .7z, .docx, .pps, .pot, .dot, .pdf, .iso, .ppsx, .cdr, .php, .psd, .sql, .pgp, .csv, .kwm, .key, .dwg, .cad, .crt, .pptx, .xlsx, .1cd, .txt, .dbf) saving their names in a separate file. Next, Trojan.Encoder.252 checks the availability of the servers to forward the encryption key to. If the malware cannot connect to the servers, a message appears on the screen asking the user to check the Internet connection settings. If encryption proceeds successfully, file names are appended with “Crypted”. The Trojan also replaces Windows Desktop wallpaper with the image that instructs the user how to unlock the computer.

Moreover, the Trojan generates the “ПРОЧТИЭТО.txt” file (PROCHTIETO.txt) containing a unique ID for file decryption and saves it on the victim's computer.

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.

Find out more about Dr.Web for Android

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