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Sigrun ransomware. How to delete? (Removal tutorial)

removal by Jake Doevan - - | Type: Ransomware

Sigrun ransomware is a file-encrypting virus which demands to pay the ransom in digital currency

Sigrun ransomware
Sigrun ransomware is a hazardous cyber threat which compromises data on the victimised computer and demands to pay the ransom in DASH or Bitcoin cryptocurrency.

Sigrun is a ransomware-type infection which is designed to compromise data on the targeted computer particularly. Once it has settled on the system, all files are marked with .sigrun extension and become unreadable. Thus, victims receive the ransom note in the form of RESTORE-SIGRUN.txt file in each of the encrypted folders. Criminals demand to pay even around $2 500 in cryptocurrency — people should contact them via sigrun_decryptor@protonmail.ch email address and make the transaction in DASH or Bitcoin. 

Name Sigrun
Type Ransomware
Extension .sigrun
Indicated email address sigrun_decryptor@protonmail.ch
Ransom note RESTORE-SIGRUN.txt
Distribution methods Spam emails; malicious files on P2P networks; malvertising;
Decryptable Only Russian-speaking victims can decrypt data for free
Removal The best solution to uninstall Sigrun ransomware is get Reimage and scan computer files

According to the analysis, experts believe that authors of Sigrun virus are based in Russia. It is because criminals are ready to decrypt files encrypted by the ransomware for free if the victim is Russian. Additionally, there is a hidden meaning in the name of the malware, as Sigrun corresponds to the victory rune. 

Victims receive the following ransom note by Sigrun:

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:

However, once the ransomware enters the system, it immediately starts the encryption procedure. Files which are appended with .sigrun extension become unusable. Thus, victims must contact the attackers for Sigrun decryptor to get back the access to their data. Unfortunately, cybercriminals are not the ones you should trust. 

Keep in mind that Sigrun malware is programmed to alter system settings. This way, even if you turn off the computer, the ransomware starts each time you turn it on. Sadly, most of the victims give up after trying to eliminate the virus and agree to pay the ransom for the criminals. 

However, there are no guarantees that the attackers will give you the decryption software and that it will be useful. Thus, we strongly recommend you to rely on the opinion of the experts and remove Sigrun as soon as it hits your computer. Since this might be a complicated task, we have prepared instructions how you can do it safely and quickly. 

Use Reimage for Sigrun removal if you want to speed up the procedure. Ransomware-type infections have numerous hidden components that must be eliminated as well. Likewise, uninstalling the malware automatically is the safest option. Later, you will be able to try alternative data recovery methods to decrypt the compromised data. 

Spam emails: the main malware distribution source

Sigrun ransomware
Sigrun ransomware is distributed via malicious spam emails.

During the years, cybercriminals became highly skilled in social engineering schemes and managed to develop a deceptive way for ransomware distribution. It is widely used across the world and relies on the credulity and lack of IT knowledge of computer users.

Attackers design innocent looking emails which seem to come from a reliable and even well-known company as invoices, shopping receipts, etc. Usually, the letters contain an attachment which appears to be a PDF file. However, this is merely a trick since the file holds an executable of the ransomware.

Once the novice computer user opens the malicious attachment, malware enters the system and starts data encryption. Thus, we strongly recommend you to never click on any suspicious emails that you receive. In fact, always use professional security software to protect your system.

Automatic Sigrun virus elimination

Ransomware-type infections are one of the most hazardous ones. Usually, criminals might program them to open backdoors for other cyber threats to your computer. Thus, there is no need to delay Sigrun removal or agree to pay the ransom. You should immediately get rid of this malware.

Since most of the computer users do not have the necessary skills to remove Sigrun by themselves, we suggest employing a robust antivirus. Experts have examined multiple ones, and picked Reimage, Malwarebytes, and Plumbytes Anti-MalwareNorton Internet Security as the best options for ransomware elimination. 

After you uninstall Sigrun virus, there are several alternative data recovery methods. Some of them might help you get back a part or even all encrypted data. You will find instructions on how to use them down below. Please, be attentive and make sure that you follow them strictly.

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To remove Sigrun virus, follow these steps:

Eliminate Sigrun using Safe Mode with Networking

First step in ransomware elimination: Boot your computer into Safe Mode with Networking.

  • Step 1: Restart your computer in Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Go to Start Shutdown Restart OK.
    2. As soon as your computer starts, start pressing F8 key repeatedly before the Windows logo shows up.
    3. Choose Safe Mode with Networking from the list Choose 'Safe Mode with Networking' option

    Windows 10 / Windows 8
    1. Click on the Power button at the Windows login screen, and then press and hold Shift key on your keyboard. Then click Restart.
    2. Then select Troubleshoot Advanced options Startup Settings and click Restart.
    3. Once your computer starts, select Enable Safe Mode with Networking from the list of options in Startup Settings. Choose 'Enable Safe Mode with Networking' option
  • Step 2: Remove Sigrun

    Sign in to your account and launch any Internet browser. Download a legitimate anti-malware software, for instance, Reimage. Make sure you update it to the latest version and then run a full system scan with it to detect and eliminate all malicious components of the ransomware to remove Sigrun completely.

If your ransomware does not allow you to access Safe Mode with Networking, please follow the instructions provided below.

Eliminate Sigrun using System Restore

  • Step 1: Restart your computer in Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Go to Start Shutdown Restart OK.
    2. As soon as your computer starts, start pressing F8 key repeatedly before the Windows logo shows up.
    3. Choose Command Prompt from the list Choose 'Safe Mode with Command Prompt' option

    Windows 10 / Windows 8
    1. Click on the Power button at the Windows login screen, and then press and hold Shift key on your keyboard. Then click Restart.
    2. Then select Troubleshoot Advanced options Startup Settings and click Restart.
    3. Once your computer starts, select Enable Safe Mode with Command Prompt from the list of options in Startup Settings. Choose 'Enable Safe Mode with Command Prompt' option
  • Step 2: Perform a system restore to recover files and settings
    1. When the Command Prompt window appears, type in cd restore and press Enter. Type 'cd restore' without quotes and hit 'Enter'
    2. Then type rstrui.exe and hit Enter.. Type 'rstrui.exe' without quotes and hit 'Enter'
    3. In a new window that shows up, click the Next button and choose a restore point that was created before the infiltration of Sigrun and then click on the Next button again. When 'System Restore' wizard comes up, click 'Next'. Choose a preferable restore point and click 'Next'
    4. To start system restore, click Yes. Hit 'Yes' and start system restore
    After restoring the computer system to an antecedent date, install and check your computer with Reimage to uncover any remains of Sigrun.

Bonus: Restore your files

Using the tutorial provided above you should be able to eliminate Sigrun from the infected device. novirus.uk team has also prepared an in-depth data recovery guide which you will also find above.

There are a couple of methods you can apply to recover data encrypted by Sigrun:

Use Data Recovery Pro software

Even though the developers have created this software for accidentally deleted or wrecked files, it might be used after ransomware attack as well.

  • Download Data Recovery Pro;
  • Install Data Recovery on your computer following the steps indicated in the software’s Setup;
  • Run the program to scan your device for the data encrypted by Sigrun ransomware;
  • Recover the data.

Get ShadowExplorer for help

Some ransomware-type viruses do not delete Shadow Volume Copies from the computer during the attack. In this case, you are advised to employ this tool.

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • Install Shadow Explorer on your computer following the instructions in the software’s Setup Wizard;
  • Run the program. Navigate to the menu on the top-left corner and select a disk containing your encrypted files. Look through the available folders;
  • When you find the folder you want to recover, right-click it and select “Export”. Also, choose where the recovered data will be stored.

Experts are currently working on Sigrun decryptor.

About the author

Jake Doevan - Do not waste your precious time dealing with computer virus infections alone

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