[KB7049] Clean a GandCrab infection using the ESET GandCrab decryptor

Issue

  • Your ESET product detected a Win32/Filecoder.GandCrab infection
  • Decrypt specific variants of your files using the ESETGandCrabDecryptor.exe tool (Currently only 979 released keys for Syrian victims are supported)
  • Your personal files have become encrypted
  • Your files have been renamed with one of the following extensions: .GDCB, .CRAB, .KRAB, or .RANDOM_CHARACTERS
  • You receive the following messages your computer's desktop background, or in a .txt or .html file:

"Attention! All your files documents, photos, databases and other important files are encrypted and have the extension..."

Details

Win32/Filecoder.GandCrab is a trojan that encrypts files on local drives. Users are told they have to download and install the Tor browser (commonly used for Dark Web), send information, and make a payment using the Bitcoin or Dash payment service to decrypt their files.

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Solution

  1. Download the ESET GandCrab decryptor tool and save the file to your desktop.

  2. Click StartAll Programs Accessories, right-click Command prompt and select Run as administrator from the context menu.

    • Windows 8 / 8.1 / 10 users: press the Windows key + Q on your keyboard to search for applications, type Command prompt into the Search field, right-click Command prompt and then select Run as administrator from the context menu.

  3. Type the command cd %userprofile%\Desktop (do not replace "userprofile" with your username–type the command exactly as shown) and press the Enter key on your keyboard.

  4. Type the command ESETGandCrabDecryptor.exe and press the Enter key on your keyboard.

  5. Read and agree to the end-user license agreement.

  6. Type ESETGandCrabDecryptor.exe C: and press the Enter key on your keyboard to scan the C drive. To scan a different drive replace C: with the applicable drive letter.

GandCrabDecryptor Switches

In most cases, running the ESET GandCrab decryptor tool as shown in step 6 is the best choice. However, if you are familiar with command line switches, the following switches are available for use with the GandCrabDecryptor tool:

  • /s— run the tool in silent mode
  • /f— run the tool in forced mode
  • /d— run the tool in debug mode
  • /n— run the tool and only list files for cleaning
  • /h or /? — show usage

The ESET GandCrab decryptor tool will run and the "Looking for infected files..." message will be displayed. If an infection is discovered, follow the prompts from the ESET GandCrab decryptor tool to clean your system.

Figure 1-1

Need Assistance in North America?

If you are a North American ESET customer and need assistance, visit helpus.eset.com to chat with a live technician, view product documentation or schedule a consultation with an ESET Home Advisor.