Infected with Sigrun ransomware? Need to decrypt your files?

What is Sigrun ransomware

Sigrun Ransomware (or Sigrun 1.0 ransomware) is a malicious program, which encrypts all documents, databases, media files on users PC without a permission. Decryption method is RSA, so it’s very difficult to decrypt .sigrun files without decryption tool, but at present moment it doesn’t exist. Some elements in the virus code indicate, that developers are fond of Iceland and Norwegian mythology. After the short procedure of encryption, Sigrun ransomware starts to show ransom notes, where developers demand money for decryption. They offer free decryption only for 3 files, for proving, that they really can restore encrypted data. NOTE! We strongly recommend to not pay them anything! Real decryption is not warranted. Besides, all payments will support the creation of similar viruses in future. Example of ransom note(below):

~~~~~~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.
As a proof we will decrypt 3 files for free!
Please, attach this to your message:

Sigrun ransomware starts to infect users machines since may 2018. The author is decrypting Russian victims for free. Example of virus code, which refers to old Iceland songbook:

Þá brá ljóma
af Logafjöllum,
en af þeim ljómum
leiftrir kómu,
hávar und hjalmum
á Himinvanga,
brynjur váru þeira
blóði stokknar,
en af geirum
geislar stóðu.

We recommend to remove Sigrun Ransomware and not to pay the ransom. Also in our article, we offer all available methods of restoring .sigrun files.

Sigrun ransomware

How Sigrun ransomware infected your PC

Sigrun ransomware spreads without user contest and distributes though English speaking countries. Sometimes it infiltrates PC from other countries. Ransomware threats spreads through the malicious emails and unprotected network configuration, including remote desktop configuration. For decent defense from ransomware threats, you should never download programs from the suspicious sources and use backup copies. The only way to protect your computer from such threats is to install antiviruses with crypto-protection like HitmanPro.Alert with CryptoGuard.

What to do if you are infected with Sigrun ransomware virus?

First of all don’t panic. Follow these easy steps below.

1. Start your computer in Safe Mode with networking. To do that, restart your computer, before your system starts hit F8 several times. This will stop system from loading and will show Advanced boot options screen. Choose Safe mode with networking option from the options list using up and down arrows on your keyboard and hit Enter.
2. Log in to the system infected with the Sigrun ransomware virus. Launch your Internet browser and download a reliable anti-malware program and start a full system scan. Once the scan is complete, review scan results and remove all entries detected.

Recommended Solution:

Norton is a powerful removal tool. It can remove all instances of newest viruses, similar to Sigrun ransomware – files, folders, registry keys.


Download Norton*Trial version of Norton provides detection of computer viruses for FREE. To remove malware, you have to purchase the full version of Norton.

Step 2: Remove following files and folders of Sigrun ransomware:

Remove following Internet connections:

Check following files:

C:\Documents and Settings\RESTORE-SIGRUN.txt
C:\Documents and Settings\RESTORE-SIGRUN.html
C:\Documents and Settings\Administrator\RESTORE-SIGRUN.txt
C:\Documents and Settings\Administrator\RESTORE-SIGRUN.html

How to decrypt files infected by Sigrun ransomware (Sigrun files)?

Use automated decryption tools

Sigrun decryption tool from Kaspersky

kaspersky rakhni decryptor for Sigrun ransomware

There is ransomware decryptor from Kaspersky that can decrypt Sigrun files. It is free and may help you restore Sigrun files encrypted by Sigrun Ransomware virus. Download it here:

Download Kaspersky RakhniDecryptor

Decrypt Sigrun files manually

Restore the system using System Restore

system restore

Although, latest versions of Sigrun ransomware remove system restore files, this method may help you to partially restore your files. Give it a try and use standard System Restore to revive your data.

  1. Initiate the search for ‘system restore
  2. Click on the result
  3. Choose the date before the infection appearance
  4. Follow the on-screen instructions

Roll the files back to the previous version

Previous versions can be copies of files and folders created by Windows Backup (if it is active) or copies of files and folders created by System Restore. You can use this feature to restore files and folders that you accidentally modified or deleted, or that were damaged (in our case – encrypted by Sigrun ransomware). This feature is available in Windows 7 and later versions.

windows previous versions

  1. Right-click the file and choose Properties
  2. Open the Previous Version tab
  3. Select the latest version and click Copy
  4. Click Restore

Restore Sigrun files using shadow copies


  1. Download and run Stellar Data Recovery.
  2. Select type of files you want to restore and click Next.
  3. Select the drive and folder where your files are located and date that you want to restore them from and press Scan.
  4. Once the scanning process is done, click Recover to restore your files.

Protect your computer from ransomware

hitmanpro alert with cryptoguard

Most modern antiviruses can protect your PC from ransomware and crypto-trojans, but thousands of people still get infected. There are several programs that use different approach t protect from ransomware and lockers. One of the best is HitmanPro.Alert with CryptoGuard. You may already know HitmanPro as famous cloud-based anti-malware scanner. Check out ultimate active protection software from SurfRight.

Download HitmanPro.Alert with CryptoGuard

Information provided by Tim Kas

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