How to remove Sigrun virus and restore encrypted files

If you've encountered a ransomware and you know that it is the Sigrun virus – in our article you'll find useful information. We propose plain and tested instructions about Sigrun removal and practicable methods to recover the wasted files.

What is Sigrun

Ransomware is a scarecrow of a present society, and every user knows that if you can not access the information and there's a ransom note – the things are turning ugly. It is a true, unfortunately. Ransomware threat is the ugliest threat that you might face on the Internet since a common customer has no resources to eliminate it. The only situation when you're able to beat ransomware is when you aren't facing a true one, but a screenlocker, that covers the display and tries to lure your money. In any other event, if ransomware was created and maintained in a proper method – you should only expect that malware researchers will deal with it. If web-criminals committed a mistake, and there are any drawbacks, that let you to restore information – you'll find a solution in this entry.




Bypassing the ransomware’s sort, the AES and RSA methods are too tricky difficult to decipher them directly. It might take hundreds of years to carry out all necessary operations on a common computer and, possibly, twenty or thirty years in case of usage of an industrial computer. The best way to neutralize a good virus is to hack into it, or break into its server, to get a master key. Some viruses also have a breaker, allowing to cease virus' operation in full or to leave unscathed the infected device. If someone discovers such breaker for this ransomware, or publish a decryption program, we will give you full info in this article.


~~~~~~SIGRUN RANSOMWARE~~~~~~~~~


Dear user, all your important files have been encrypted!

Don't worry! Your files still can be restored by us!


In order to restore it you need to contact with us via e-mail.

This email address is being protected from spambots. You need JavaScript enabled to view it.

As a proof we will decrypt 3 files for free!


Please, attach this to your message: -


Let's find out, what we'd find if we look inside a Sigrun? It is driven by an absolutely legitimate coding algorithm that ciphers all data on user’s machine, so user can't utilize them in any approach. Of course, a key is encrypted too, but with another method. As usual, these algorithms are AES and RSA, which are known for their complexity and fail-safety. The mentioned algorithms and the programs based on them are freely available on the Internet, so hackers only have to create protective mechanisms, to block an access to a ransomware, and create the safe control and update system. Some encrypting tools can act on their own, and fraudsters know about another "client" only when he approaches them and forwards his funds. The complex ransomwares are highly active, and deliver reports to thousands servers, to confuse the malware-fighters and maximize the time needed to beat a virus.


Here you can find a few things to inspect, before giving up and expecting for a decryption tool. As we said earlier, scammers also fail, and some characteristics of the OS can help you to get back the lost data.


  • If your system entry doesn't have administrator authorization – it's your lucky day. The point is that the operating system makes copies of all data until they’re destroyed or altered. Those copies are known as the SVC, and the ransomware has the manners to destroy them. If you are acting from the usual account – the OS requests for a authorization at the very second Sigrun attempts to erase shadow copies. In case you saw such request and reversed it – your SVC are safe, and you should find a topical software to restore the information.
  • A protected copy is the only 100% productive manner to restore your info, but you should uninstall Sigrun prior to it. Make sure that Sigrun is gone in full, as if it’s not – all information will be corrupted instantly, including the files that are on an outer hard drive.


If you revised both these things and you have no chance to restore lost files – you have to uninstall Sigrun from your PC and wait until a decryption program will be published.

How to remove Sigrun

Unfortunately, there’s no chance to entirely avoid an automatic mode. This ransomware is incredibly stealthy and there is a chance pass some remains and then suffer from it (for example, when you line up a flash data storage with your backups to a not-fully-purged device). It also hides damn well, and you literally won’t be able to delete it completely with your own hands. Knowing this, we have made an efficient removal specification which will suit all your needs. It contains some manual phases and an optional antivirus 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

We offer you to try Spyhunter AntiMalware that is not simply effective, but is modern and constantly evolving software which is able to clear your PC of all perilous programs. Press the button below to purchase Spyhunter and eliminate Sigrun.


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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 got rid of Sigrun, it's time for the data recovery. As we said earlier, if you logged in from an admin entry and you permitted Sigrun a pass into the system – there is no trick to recover your data save for the backups. If you use a common profile – you still have a chance, but it will require specific recovery tool. We suggest you to try ShadowExplorer and Recuva programs. They're simple to get on their official websites, with thorough instructions.

  • 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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