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BASS-FES ransomware virus. How to remove? (Uninstall guide)

removal by Jake Doevan - - | Type: Ransomware
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BASS-FES asks for 1 BTC for data recovery

Ransom note by BASS-FES ransomware virus

BASS-FES (BitchASS File Encryption System) is a ransomware-type cyber threat that is based on the HiddenTear project. The virus uses AES cryptography[1] and appends the .basslock file extension to the encrypted files. Then it drops a ransom note called “the BASS the File the Encryption the Service Notice.txt” on the affected computer’s desktop.

The crypto-malware is most likely to infiltrate the device when a user opens an infected email attachment. When malware’s payload is installed and executed, the BASS-FES virus starts scanning the system looking for the targeted files. It aims at the most popular file types, such as Word documents, PDFs, various image, audio or video files, databases, and much more to make ransomware attack a disaster.

When all files are locked with .basslock extension, the BASS-FES ransomware delivers a ransom note in TXT file and provides data recovery instructions. Victims have to transfer 1 Bitcoin to the provided Bitcoin wallet address and send an email to bitchasshole@protonmail.com:

File Recovery Notice by BitchASS File Encryption System (BASS-FES)
Your files have been successfully encrypted and backuped in the cloud storage by BASS File Encryption System.
If you want to recover your files, please send 1 BTC to the following adress: [deleted ]
If you sent 1 BTC to the adress, email at bitchasshole@protonmail.com with your Bitcoin adress.

However, paying the ransom is not recommended because it might end up with money loss. Criminals might blackmail you and ask to pay even more. Besides, there’s no guarantee that they have working decryptor and keep their word. Thus, security experts from Finland[2] suggest remaining calm and focusing on BASS-FES removal.

We want to warn that ransomware is a dangerous cyber threat that downloads numerous hazardous files to the system and might inject malicious codes into various system processes. Therefore, it’s important to wipe out malware carefully. In order to remove BASS-FES without damaging the system, you should use reputable malware removal tools, such as Reimage.

Criminals use multiple ways to spread the virus

Developers of the file-encrypting virus rely on malicious spam emails to spread malware executable hidden-tear.exe. These emails typically pretend to be sent from legit companies[3] and organizations that warn about a serious issue. Most of the time criminals trick people into opening fake invoices, statements, and similar documents.

However, BASS-FES might also pretend to be a legit software or its update. Usually, suspicious pop-ups trick users that their computers might be infected with a virus and suggest installing unknown security software.

Additionally, malware might be hidden in illegal downloads that are available on various freeware download sites or P2P networks. Therefore, users are advised to stay vigilant and avoid clicking, opening or downloading suspicious content.

BASS-FES elimination instructions and alternative recovery methods

Data encryption seems to the main problems after the ransomware attack. However, it’s more important to delete malicious components from the system in order to use a computer safely again. If you try to restore files from backups or use third-party tools, you might get your files encrypted again, so you have to remove BASS-FES first.

To wipe out malicious program safely, you have to obtain reputable malware removal software. For BASS-FES removal, we highly recommend scanning the system with Reimage or Malwarebytes Anti Malware. If you cannot install or run security software, boot your computer to Safe Mode with Networking as shown below.

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What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall BASS-FES 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.
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Manual BASS-FES virus Removal Guide:

Remove BASS-FES using Safe Mode with Networking

If BASS-FES prevents from automatic elimination, follow these steps:

  • 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 BASS-FES

    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 BASS-FES removal.

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

Remove BASS-FES using System Restore

The second method might also help to disable the virus and perform automatic elimination:

  • 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 BASS-FES. 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 BASS-FES removal is performed successfully.

Bonus: Recover your data

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

Alternative recovery methods might help to restore at least some of the corrupted data until the official decryptor will be released.

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

Try Data Recovery Pro to open files with .basslock extension

This program helps to restore corrupted files. Thus, it might help after the ransomware attack as well.

Windows Previous Versions feature helps to access individual files

If System Restore was enabled before ransomware attack, you can copy individual files that were saved before BitchASS File Encryption System infiltration.

  • 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”.

Try ShadowExplorer if Shadow Volume Copies were not deleted

If malware failed to delete or did not delete Shadow Volume Copies of the targeted files, this tool might help you:

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

Decryptor for BASS-FES hasn't been released yet.

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

About the author

Jake Doevan
Jake Doevan - Computer technology expert

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References