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QNAP QLocker Recovery Walkthrough with QRescue Software

27 mai 2021 à 02:00

A Guide to Recovering Your NAS Files from the QLocker QNAP NAS Malware Attack

Good news for those of you whose QNAP NAS systems were affected by the QLocker Malware attack last month – a recoverable solution has been produced by QNAP on this (with assistance from 3rd party open source project PhotoRec) that, although a little long and technical, is a great deal more understandable than many QLocker solutions that have appeared yet. This new method does not need users to open SSH on their system and although there is a degree of command/code entry involved, it is moderately straightforward and will hopefully allow you to avoid paying the ransomware fee to recover files. This method centres around file recovery, rather than breaking the encryption, so like any data recovery practice, this is not going to be tremendously quick – i.e. it will be largely dictated by the volume of files that need recovery. It will be interesting to see how much QNAP HQ have learned from this Qlocker business, what can be done to avoid this in future and if QRescue and collaborative builds with recovery software like PhotoRec can build towards a standardized NAS tool that can be used more generally in recovery in the future. Nevertheless, below is the guide that was provided by QNAP and includes tools and links to resources that will help you get the recovery completed.

Important Note – Do not attempt this ‘casually’. This method is by no means as intrusive as other methods in the last few weeks that involved messaging with the encrypted files themselves but IS a guide you should be prepared to action from beginning to end in a single session – so make sure you have allowed a good stretch of time to do this! Additionally, you WILL need access to an external Hard Drive/SSD that is 1.5-2 times the size of the data you are trying to recover, as additional space is liked needed during the recovery of files before they are completed. Make sure the external drive is EMPTY as it WILL be formatted.

Step By Step Guide to Recovering Encryptioned QNAP NAS files from QLocker

Make sure your QNAP NAS is running normally and no firmware/restarts are scheduled during the process of running PhotoRec or QRescue on your NAS. Additionally, another reminder that the external HDD/SSD that you use for the recovered files from QLocker WILL be formatted during following these steps. This Guide covers:

  • Overview
  • Requirements


  • Part 1. Configure external HDD with the name “rescue” and create folders with the name “recup1” for recovery.
  • Part 2. Download and Manually Install the QRescue App
  • Part 3. Run PhotoRec
  • Part 4. Run QRescue
  • Part 5. Move the recovery data to your NAS.

Let’s begin.


QRescue is the data recovery tool for Qlocker-encrypted 7z files. It contains:

  • PhotoRec (Open Source Project / GNU General Public License / Project Link):
    File recovery software designed to recover lost files from hard disks and CD-ROMs, and lost pictures (thus the Photo Recovery name) from the storage medium.
  • QRescue (Powered by QNAP):
    The script to recover file structures from the encrypted 7z files and PhotoRec files.


  • Download the QRescue app from this link.
  • Prepare an external hard disk drive with a capacity larger than the total used storage space on your NAS.
    • Note: It’s advised to prepare an external HDD with 1.5 to 2x free space than the total used storage space on your NAS. Additional space might be required during the recovery process. If the available space is less than the suggested value, error and other issues may occur.


Part 1. Configure external HDD with the name “rescue” and create folders with the name “recup1” for recovery.

QRescue will process the recovery process to external drive first, and we need to do some configuration for this recovery process and create the specific destination and folder name.

  1. You need to prepare an external HDD that its usable capacity is larger than the total used storage size of your NAS. This is because you will recover the files to the external device first. Please check your used volume size first by clicking More > About on the QTS desktop.
  2. Insert the external drive to your NAS. Please go to Storage Manager > External Device > Select your external device > Click “Actions” > Click “Format” to format the external drive.
  3. The File System must be “EXT4”, and the Label name must be key in “rescue”. If these configuration is ready, please click “Format

    The QRescue app will use “rescue” as the external drive name. If you use other names, the recovery process might fail.
  4. (Optional) If you disable the admin account or you don’t use admin to login QTS, you might not see the external drive on the File Station. Please go to Control Panel > Privilege > Shared Folder > Edit Shared Folder Permission to enable or change read / write permission for “rescue” folder and to match the account that you log in the NAS.
    • Sample:
      Grant other administrator group account (Example: “_qnap_support” is the administrator group account for read/write permission to external hard drive naming “rescue”).

  5. Using File Station to check the volume for the correct external device name.
  6. Create the new folder and name as “recup1” (format: recup+{number}). If you have more than one storage volume, you need to add more folders for recovery.

    The QRescue app will use “recup+{number}” as the folder name. If you use other names, the recovery process might fail.

    Part 2. Download and Manually Install the QRescue App

    This QRescue app is a special build. Therefore, you need to manually install this app from the QTS App Center.

  7. Please go to this link to download the QRescue app.
  8. Please go to App Center > Click Install Manually > Click Browse to find the QRescue app location on your computer.
  9. After selecting the app location, you can click Install. Wait until the installation completes and open the QRescue app on QTS desktop or side-bar.
  10. When you open the QRescue app, you will see the web console. It can help to run PhotoRec and QRescue to recover your files.

    Part 3. Run PhotoRec

    Running PhotoRec can help you to recover the lost files from hard disks to the external drive. Now you will recover the NAS files to the “recup1” (example: recup+{disk_number}) folder on the external drive.

  11. Type this command and press Enter on your keyboard. You will start to run PhotoRec.
  12. Use Up/Down arrows to choose the hard drive. And you can start to select the NAS disk for running recovery by PhotoRec.
    • Sample:
      • /dev/mapper/cachedev1 as 1st data volume
      • /dev/mapper/cachedev2 as 2nd data volume
      • /dev/mapper/cachedev20 as 20th data volume
    • Note:
      You can check the number of data volumes in Storage & Snapshots > Storage/Snapshots
  13. Select the “ext4” partition and press “Enter
  14. Select the file system as [ ext2/ext3 ] and click “Enter” key.
  15. Select the space as [ Whole ] and click the “Enter” key.
  16. Now we need to select the external device’s folder as the recovery destination.
    • Source Destination: /share/external/DEV3301_01/qpkg/QRescue   [QRescue qpkg]
    • Recovery Destination: /share/rescue/recup1 [External Device]
    • Click “..” to go back to the upper level folder
      • Sample destination: External disk on QRescue app
      • Sample: External Device (name: rescue) > Destination Folder (name: recup1)
  17. Please click “C” on the keyboard when the destination is “/share/rescue/recup1”.
  18. Start to run the recovery process by PhotoRec. Now you can see the estimated time to completion.
  19. When you finish the PhotoRec, you can press enter when you select  [Quit] or type in “ctrl-c” to exit.

    Part 4. Run QRescue

    Run QRescue can help you to recover the files retrieved by PhotoRec. Now you will recover the files from the “recup+{number}” folder to the “restore+{number}” folder which auto creates on your external drive.

  20. Type this command and click Enter on your keyboard. You will start to run QRescue.
  21. (Optional) If you have two or more data volumes on your NAS, the screen will let you select which data volume you will start the process. Please type the number and press “enter”. If you only have one data volume, you might not see this step.

  22. (Optional) Now you can see the progress for which files were completed in the recovery process.
  23. When all of the QRescue process is completed, the screen will show the result summary and the process for sending the system log.
  24. QRescue app also will send the event log to QuLog Center / System Log and notify you on finishing the whole recovery process. If you have opened the QNAP support ticket, don’t forget to make the feedback for your case. QNAP support team will help you to double check. Thank you very much.

Part 5. Move the recovery data to your NAS.

You can move the recovery data to your NAS by File Station


So, did this QLocker recovery guide work for you? How did you find the PhotoRec and QRescue applications did their job? Let me know in the comments and share with others how well/poorly this guide helped you recover your files from ransomware encryption.

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