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Trojan.Encoder.10465

Added to the Dr.Web virus database: 2017-03-14

Virus description added:

SHA1:

  • fbbf8e3877a1bb826be623908fc93e570967b666

A malicious program belonging to the family of Trojans that encrypts files on the computers and demands a ransom from users for decryption of compromised data. Written in Delphi.

Once launched, it checks for presence of the VBoxService.exe running process, and in case of its detection, the Trojan goes to an infinite pause mode. When launched with the command line parameter -d, it decrypts the encrypted files. Checks for presence of the following system registry key:

HKCU\Software\mscloq

Then with the help of local proxy server, the Trojan attempts to connect to the command and control onion server located in the TOR network. Encryption is performed only in case of the successful connection.

Once launched, the Trojan checks if it is executed from the mtrea.exe file, and if it is not, it creates a file with such name in the %APPDATA% folder. If this condition is satisfied, the Trojan checks for presence of the process with such name and shuts down in case of its detection.

It registers its executable file in the following system registry branch:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run 

The encryption of files on the infected computer is performed using the DCPCrypt library and AES algorithm in the CBC mode with the 256-bit key. The encoder appends the infected files with .crptxxx extension and saves a text file on the disc. The file’s name is HOW_TO_DECRYPT.txt and it has the following content:

Warning!!!
All your files are encrypted with AESalgorithm!
For decrypt use this instructions: 
Download tor browser
Run tor and go to: http://vejtqvliimdv66dh.onion
Or you can use tor2web services
http://vejtqvliimdv66dh.onion.to
in log panel enter your id (CRPTksrjghkrkwkrjthkewVM)
follow next instructions
if server is down, try connect later
locker version 3.0.0

Decryption of files encrypted with this Trojan is possible.

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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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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