Fenrir ransomware virus. How to remove? (Uninstall guide)

removal by Olivia Morelli - - | Type: Ransomware
Reimage is recommended to uninstall Fenrir.
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Fenrir ransomware appends unique 10 character extension to targeted files

The picture of Fenrir ransomware

Fenrir is a crypto-malware that uses AES[1] encryption to corrupt files on the affected computer. Malware asks to pay $150 for data recovery and provides all detailed recovery instructions in Ransom.rtf file.

The virus does not append one specific file extension. It creates a unique suffix based on the affected computer’s ID. Malware has an embedded Hardware Identification tool that assists in creating the unique extension from first 10 characters of computer’s ID.

Fenrir ransomware has been noticed spreading as a fake Adobe Acrobat Reader. However, cybercriminals might use numerous strategies to infiltrate devices in China,[2] Sweden or other parts of the world.

The research revealed that malware is written in Visual Studio 2017. It is created to modify Windows Registry and making other changes to the affected system. Such activities are necessary to run the virus with system startup and launch its malicious activities.

Undoubtedly, the major task for Fenrir virus is data encryption. Once all targeted files are encrypted, malware drops a text file and run a program window called “All Your Files Have Been Locked.” The ransom-demanding message asks to send $150 before the timer runs out.

Cyber criminals provide Bitcoin ID address where victims are supposed to transfer the money. When the transaction is made, people have to send personal ID and transaction ID to whiterabbit01@mailinator.com.

Accepting hackers’ offer may be the only possibility to recover your files. Malware is suspected for deleting Shadow Volume Copies of the targeted data. Thus, decryption with third-party software may not be sufficient. However, this situation should not motivate you to take this risky deal.

Ransomware viruses are blackmailing tools that are created to swindle the money from the computer users. Thus, data recovery is just a matter of hackers’ conscience. We do not recommend testing if cyber criminals are willing to keep their word or not. It’s better to remove Fenrir and lose your files than suffering from money loss as well.

Virus elimination is performed with reputable security software, such as Reimage. Of course, you can choose your preferred malware removal tool. However, don’t forget to update it first. If you cannot run automatic Fenrir removal, please scroll down to the end of this article and follow the instructions.

Cyber criminals use multiple distribution methods to infiltrate computers

Malware researchers have found a Fenrir spreading with the help of Adobe Reader.exe and pretending to be Adobe Acrobat Reader. Thus, if you need to install this program, make sure that you are downloading it from the official publishers’ site.

Fake downloads are only one distribution method of the file-encrypting virus. It might also enter the system using malicious spam emails and exploit kits.[3] The malicious payload might be downloaded to the system when:

  • user clicks on obfuscated Word, PDF or another document;
  • user clicks on button or link provided in the email;
  • user keeps the outdated software on the computer.

Therefore, in order to avoid Fenrir attack, you need to follow two major rules. First, you have to stay away from unknown emails and avoid clicking provided content in them. Second, to keep software and system updated.

Wipe out Fenrir virus with the help of security software

Fenrir removal must be performed using reputable malware removal software. Ransomware is a complicated virus that might install numerous malicious files and affect system processes. Thus, its removal should be completed correctly.

Before running a full system scan with security software, you may need to reboot the computer to the Safe Mode with Networking first. This mode helps to disable the virus and get rid of it automatically.

If you are not sure what tool to choose, we recommend using either Reimage or Malwarebytes Anti Malware. We can assure that both of these programs can remove Fenrir from the system entirely.

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Reimage is recommended to uninstall Fenrir ransomware virus. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.

More information about this program can be found in Reimage review.

More information about this program can be found in Reimage review.

Manual Fenrir virus Removal Guide:

Remove Fenrir using Safe Mode with Networking

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

Follow the steps below to disable the virus and run automatic malware elimination.

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Fenrir

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Fenrir removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Fenrir using System Restore

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

In order to disable the virus you can use System Restore method.

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Fenrir. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Fenrir removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Fenrir from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

If you do not have backups, your chances to recover files encrypted by Fenrir ransomware are not high. However, you should still try alternative recovery methods suggested below.

If your files are encrypted by Fenrir, you can use several methods to restore them:

Restore encrypted files with Data Recovery Pro

After Fenrir attack, Data Recovery Pro might be the only way to restore files. This tool is known for helping numerous people to recover encrypted, corrupted and deleted files. Thus, follow the steps below in order to use this tool:

Windows Previous Versions feature may help to recover files encrypted by Fenrir

If System Restore has been enabled before ransomware attack, you should follow the steps and copy necessary versions of encrypted files:

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

Fenrir decryptor is not created yet.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Fenrir and other ransomwares, use a reputable anti-spyware, such as Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware

About the author

Olivia Morelli
Olivia Morelli - Ransomware analyst

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