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Trojan.Encoder.94

Added to the Dr.Web virus database:2010-12-28
Virus description added:

This Trojan encoder was first detected on January 2011. It is written in Assembler language. The Trojan encrypts data stored on the infected computer, such as user documents, audio and video files, archives and, sometimes, executable files. The encoder uses one of the following encryption algorithms: XOR, TEA or AES. At that, it often encrypts the part of files excluding first bytes. The Trojan associates itself with encrypted files and adds the “CRYPTED!” attribute to their properties.

The constructor for creating encoders of this type, which implement TEA and XOR encryption, is available in the public domain. Most files encrypted by Trojan.Encoder.94, which was created with the use of this constructor, can be decrypted. As for decryption of files encrypted with AES method, it is possible only if the Trojan executable resides on the disk.

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.

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