Severity scale:  
  (99/100)

Osk ransomware. How to remove? (Uninstall guide)

removal by Olivia Morelli - - | Type: Ransomware

Osk is a file-encrypting malware that makes important files useless on the computer

Osk ransomware image

Osk is a file-encrypting virus from Scarab ransomware family that targets victim’s essential files and encrypts them. Malware uses a sophisticated encryption algorithm and appends .Osk file extension to each of them. Once the damage is done, it drops a ransom note HOW TO RECOVER ENCRYPTED FILES.TXT in each of the folders with encrypted data.

Summary of the cyber threat
Name Osk
Family Scarab
Type Ransomware
Targeted OS Windows
File extension .Osk
Ransom note HOW TO RECOVER ENCRYPTED FILES.TXT
Recovery Files cannot be recovered from backups only
Symptoms of the infection Encrypted files, sluggish computer, unresponsive programs, Windows errors
Distribution Malicious email attachments, malvertising, fraudulent downloads/updates
To uninstall Osk, install Reimage and run a full system scan

Ransomware attack might be scary and damaging especially for those who do not have data backups. However, security specialists recommend focusing on Osk removal procedure instead of following data recovery instructions presented in the ransom note:

Your documents, photos, databases, saving in games and other important data were encrypted.
Data recovery requires a decryptor.
To receive the decryptor, you should send an e-mail to translatos@protonmail.com
In the letter, indicate your personal identifier (see At the beginning of this document).

Osk ransomware follows the same pattern as its predecessors. Victims are asked to contact developers via translatos@protonmail.com email address and provide their unique ID number. The attackers will respond with the size of the ransom and cryptocurrency wallet address.

Victims of Osk virus are supposed to get a working decryptor as soon as criminals receive the ransom payment. However, this scenario might never become a reality. Remember that you are dealing with evil-minded people who want money only.

To avoid bigger damage, you need to remove Osk immediately without contacting crooks or paying them. While the virus resides on the computer, you might encounter other cyber threats or get new files encrypted again and again. Hence, download Reimage or other professional malware removal tool and clean malicious components from the system.

After that, you can try additional data recovery methods (we have provided them below) or plug in the external drive with backups and copy necessary files. Specialists from NoVirus.uk[1] remind that data recovery is just a secondary task. If you connect your backup storage while malware is still on PC, your precious copies of important files might be compromised too.

Ransomware attack may be launched from malicious email

There are many ransomware distribution methods; however malicious spam emails remain the most popular one for years.[2] Phishing[3] emails often include various important issues, such as, parcel delivery failure or necessity to double-check details on bank statements.

Indeed, these emails might be tricky and misleading. Especially when criminals copy the design and interface of the official company. However, you can still spot dangerous emails and stay away from their attachments:

  • Infected emails usually arrive in spam folder;
  • They often include mistakes;
  • They might be sent from weird and unofficially looking address;
  • Official credentials or logos might be missing;
  • They express the urge to open the attached document.

Keep in mind that malicious email attachments might look safe to open, and it’s the major trick. Before opening files delivered in your inbox, always double-check the information about the sender and look up for more information online.

Apart from malspam, malware develops might use malvertising, bogus software downloads, and updates, exploit kits and other methods to hijack your computer. Hence, you should follow all safe browsing practices to protect from cyber attack.

Osk removal is crucial for getting computer safety back

Ransomware attacks are dangerous for the whole computer system, so you need to remove Osk immediately. Only after that, you can proceed with file restoration processes. Otherwise, you won’t achieve desired results.

Professional security software is needed for Osk removal. We recommend downloading and using Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware. However, you should reboot PC to Safe Mode with Networking or try System Restore to complete this task without any obstacles. For more details, check the instructions below.

We might be affiliated with any product we recommend on the site. Full disclosure in our Agreement of Use. By Downloading any provided Anti-spyware software to remove Osk ransomware you agree to our privacy policy and agreement of use.
do it now!
Download
Reimage (remover) Happiness
Guarantee
Download
Reimage (remover) Happiness
Guarantee
Compatible with Microsoft Windows Compatible with OS X
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 Osk ransomware. 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.
Press mentions on Reimage

To remove Osk virus, follow these steps:

Remove Osk using Safe Mode with Networking

The following guide explains how to boot to Safe Mode with Networking which allows blocking the virus. After that, you can download and run security program without any difficulties:

  • 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 Osk

    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 Osk removal.

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

Remove Osk using System Restore

This method might also help to disable the virus:

  • 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 Osk. 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 Osk removal is performed successfully.

Bonus: Recover your data

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

Full data recovery is possible only if you have backups because the official decryptor is not released yet. However, you should not give up or rush to pay cyber criminals. It's better to try out additional recovery options and restore some of the lost data.

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

Option 1. Data Recovery Pro

This tool is created for recovering corrupted or deleted files. Nevertheless, it is not created for decrypting files specifically; it might be still helpful.

Option 2. Windows Previous Versions feature

Enabled System Restore feature allows traveling back in computer's time. So, you can get back to the date before Osk ransomware attack and copy the most important individual 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”.

Option 3. ShadowExplorer

ShadowExplorer recovers files from Shadow Volume Copies, so if malware did not delete them, follow these steps:

  • 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.

Osk decryptor is unavailable

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Osk 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

If this free removal guide helped you and you are satisfied with our service, please consider making a donation to keep this service alive. Even a smallest amount will be appreciated.

Contact Olivia Morelli
About the company Esolutions

References