How to remove Osk virus and restore encrypted files

If you've encountered an encrypting infection and you know that it is the Osk program – in our article you'll find useful info. We provide simple and efficient instructions about Osk deletion and potential ways to get back the spoiled information.

What is Osk ransomware


Encryption virus is a roadkill of mankind, and everyone knows that if you can not access the data and you see a ransom note – it’s time to worry. It is a right reaction, unfortunately. Ransomware infection is the most dangerous threat that you might face in the Net since a common user literally cannot remove it. The only situation when you're able to beat ransomware is if you’re not dealing with a true one, but a fake, that covers your screen and attempts to trick you into paying a ransom. In all other cases, if a virus was created and adjusted in a proper method – you can only hope that malware fighters will defeat it. If swindlers made a mistake, and there are some vulnerabilities, which let you to recover files – we’ll explain to you what you can do in this guide.


Ransomware kind does not really matter, as the RSA and AES algorithms are too complicated to bruteforce them. It will take thousands of years to execute all required operations on a standard computer and, maybe, twenty or thirty years in case of usage of an industrial computer. There are two solid methods to beat an encrypting malware: to hack it, or hack its database, to find encryption keys. In rare cases there is a breaker, able to stop ransomware's activity completely or to leave unscathed the infected computer. If anyone discovers that breaker for this ransomware, or make a decryptor, we will update this guide.


Let's find out, what is ransomware? It is built upon a completely legitimate encryption algorithm that ciphers all files on operator’s machine, so user can't utilize them in any way. The key is also encoded with a different algorithm. Usually, fraudsters choose RSA and AES manners, that have demonstrated themselves the most complex and sustainable. The mentioned manners and the programs based on them are in free access in the Web, so hackers just have to add techniques of protection, to block an inlet to a virus, and create the safe control and update system. Some pieces of ransomware may act off-line, and web-criminals get a report of a new "client" as late as he writes them and sets off his money. The complex viruses are function in different way, and deliver files to hundreds addresses, to puzzle the researchers and maximize the efforts required to defeat a virus.


There are a few possibilities to examine, before you can give up and await for a decryptor. As we said earlier, swindlers also fail, and some specialties of the Windows might assist you to get back the lost information.


  • If you do not use the system via an admin account – it's time to compliment yourself. The catch is that the OS replicates any data prior to their deletion or modification. These copies are known as the SVC, and the malware has the methods to destroy them. If you're using the regular account – the OS asks for a permission at the exact second Osk starts to erase SVC. If you saw such request and ignored it – your copies are secure, and might be used to get back the data.
  • A protected copy is the only entirely efficient way to get your info back, but you have to delete Osk first. Make sure that the virus is eliminated totally, since if it isn't – all files will be corrupted one more time, including those that are on an outer hard drive.


In case you revised all these opportunities and there is no chance to recover corrupted data – you have to eliminate Osk from the PC and wait until a decryption program will be created.

How to remove Osk

As about the elimination – there’s no possibility to totally escape an installation of an antiviral. The ransomware is very tricky and you will definitely pass some elements and then suffer from it (it could happen if you line up an external drive with your saved data to a not-really-clean device). It knows how to lurk very well, so you literally won’t be able to uninstall it completely on your own. According to this, we’ve created a solid removal directions that will suit all your needs. It has several manual steps and an extra anti-viral tool stage.

Removal instruction

If you are MAC user, follow this guide: how to decrypt files on MAC.




Step 1. Boot the system into safe mode

  • Press Start
  • Type Msconfig and press Enter

Safe mode. Step 1


  • Select Boot tab

Safe mode. Step 2



  • Select Safe boot and press Ok

More information about Safe mode: What is Safe Mode and how to boot computer in Safe Mode


Step 2. Show all hidden files and folders

  • Press Start
  • Click on Control Panel

Show hidden files. Step 1


  • Select Appearance and Personalization

Show hidden files. Step 2


  • Click on Folder Options
  • Select View tab
  • Select Show hidden files, folders and drives

Show hidden files. Step 3


  • Press Ok


Step 3. Remove virus files


Check next folders to find suspicious files:

  • %TEMP%
  • %ProgramData%


Step 4. Fix hosts file

  • Go to %SystemRoot%\System32\drivers\etc\ folder



  • Open hosts file using Notepad or other text editor
  • Delete suspicious elements
  • Basic hosts file looks like this:



Step 5. Clean registry (for experienced users)

  • Click Start
  • Type Regedit.exe and press Enter
  • Clean startup registry keys
  • HKEY_LOCAL_MACHINE(HKEY_CURRENT_USER)\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE(HKEY_CURRENT_USER)\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_LOCAL_MACHINE(HKEY_CURRENT_USER)\Software\Microsoft\Windows\CurrentVersion\RunServices
  • HKEY_LOCAL_MACHINE(HKEY_CURRENT_USER)\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit

Step 6. Scan computer with antivirus

Here's Spyhunter AV tool which is not just efficient, but is swift and continuously developing program which is able to clean the system of all perilous programs. Click the link under this paragraph to test Spyhunter and uninstall Osk.


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Step 7. Disable Safe Mode and restart computer

  • Press Start
  • Type Msconfig and press Enter
  • Select Boot tab
  • Remove the check near Safe boot

How to restore files

When you deleted Osk, or at though aware of how you might to do it, let’s talk over the data recovery. As you know now, if you logged in from an admin profile and you let Osk an access into the device – there is no method to recover your data save for the backups. If you that didn't happen – you have feeble odds for data restoration, but it will require specific recovery software. The most effective ones of them are Recuva or ShadowExplorer programs. You can find these tools simply on the registered sites of their creators, with thorough guides.

  • Click Start
  • Click Control Panel

Decrypt files. Step 1


  • Click System and Security

Decrypt files. Step 2


  • Select Backup and Restore

Decrypt files. Step 3


  • Select Restore files from backup
  • Select checkpoint to restore


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