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Added to the Dr.Web virus database: 2020-09-25

Virus description added:

  • Packer: absent
  • Compilation date:: 16.09.2014 04:15:09
  • SHA1 hash: b33e65fd1790260ad47a0dbdad2f12f555a0d6ca


A malicious .DLL library written in C++ and supports the 32- and 64-bit Microsoft Windows operating systems. It is a backdoor that allows attackers to remotely control infected computers via the remote shell―by running cmd.exe and redirecting input-output to their C&C server.

Operating routine

Its original name from the export table is state.dll. It has the Cja and ServiceMain exported functions.

The C&C server address is eye[.]darknightcloud[.]com:443.

This malware is based on the publicly available Gh0st backdoor source code. Compared to the original program, BackDoor.Farfli.130 has noticeably fewer capabilities, but also has several specific features. In this regard, this description will only cover the essential differences from the classic Gh0st RAT.

The C&C server address is encoded with Base64 and encrypted with a simple algorithm:


Other encrypted strings are decrypted by subtracting 1 from each byte of the string.

The infected computer ID is stored in the %APPDATA%\wins.tmp file instead of the system registry.

The traffic between the backdoor and C&C server is encrypted using the RC4 algorithm with the following key:


BackDoor.Farfli.130 functionality is limited to the following:

  • Obtaining information about storage discs
  • Receiving the process list
  • Launching the command shell and redirecting input-output to the C&C server
  • Shutting down the computer
  • Setting the ID of the infected 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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Download by serial number

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

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