Sigrun Ransomware : How To Remove? (+File Recovery Tips)

Sigrun Ransomware : Threat’s Description

Name Sigrun Ransomware
Type Ransomware
Risk Impact High
Description Sigrun Ransomware can make the infected system's files inaccessible by adding a weird '.sigrun' file extension and demands ransom fee for the decryptor.
Possible Symptoms File encryption, performance degradation of system, other malware attacks, cyber theft, etc.
Detection / Removal Tool Download Sigrun Ransomware Scanner to confirm the attack of Sigrun Ransomware virus.

Detailed Information on Sigrun Ransomware


Sigrun Ransomware is a new crypto-locker malware which is especially designed to encode the specific file types saved on affected user's machine. In order to release the encoded files, the hackers behind this threat demands a hefty sum of ransom money that needs to paid in cryptocurrency. The main objective behind asking ransom fee from the victimized users in digital currency to remain anonymous from the security agencies. Once the malicious payload of this ransomware gets executed on the targeted machine, the Sigrun Ransomware enciphers all text, audio, video, images and other vital media files and alter their name of adding '.sigrun' suffix to them.

Sigrun Ransomware

After encoding the targeted system files, the malware displays a ransom notification that can be identified as 'RESTORE-SIGRUN.txt' onto each and every folder containing encrypted data. In addition to that, it also opens a tab onto the default browser which shows the same ransom demanding message in '.html' format. The affected users are then instructed to contact the people responsible for Sigrun Ransomware attack by using an email address '[email protected]' provided in the displayed ransom note as well. Due the extension used in provided mail address i.e. '.ch', it can be assumed that the operators of this ransomware belongs to Switzerland.

How Does Sigrun Ransomware Spread & Work?

The main method used for the propagation of Sigrun Ransomware is reported as spam email campaigns. System users who open the malicious files attached to junk emails arrived from unknown sources affect their machine with such notorious cyber infection. After getting inside the machine, the malware first modifies certain system settings including registry entries or startup services in order to gain boot persistence. In this way, the threat can get started each and every time whenever the compromised machine is launched. Right after that, Sigrun Ransomware scans the entire system to locate the specific file types and makes them inaccessible for the victimized users by appending a weird file extension.

Moreover, to inform the affected users about the current situation, the threat displays a ransom note which states that the file is encrypted. Unfortunately, security analysts haven't released a decryption key needed for the restoration of files encoded by this ransomware. Cyber criminals uses a strongly encryption algorithm to make the Sigrun Ransomware affected files completely inaccessible and then send a decryption tool to the hacker's operated Command and Control server. For that decryptor, criminals can ask ransom money from the victimized users. However, you should avoid paying asked ransom money and remove it from your computer as early as possible.

Free Scan your Windows PC to detect Sigrun Ransomware



What To Do If Your PC Get Infected By Sigrun Ransomware

The ransomware infection has been mainly designed with the purpose to scare users and trick their money. It take your files on hostage and demand ransom to return your important data. But now the question is what you can do when your system got infected by Sigrun Ransomware virus? Here are some option that you can use to get rid of this nasty infection.

Don’t Panic – Well the first thing is Don’t panic and then completely check out your system for any working files. If you got any working files then copy it to USB drive.

Pay Ransom – Other option is you can pay the ransom and wait to get your files back. (really a bad option)

Use Backup – Clean you entire system files, remove the infection completely from your PC and restore your files with any backup.

Remove Infection – You can also delete Sigrun Ransomware virus using malware removal tool and remove all the infected files. You can later recover all your data by using any data recovery tool. (In case you don’t have backup of your files.) – Recommended Method.

Reinstall Windows – The last option is reinstall your Windows OS. It will completely remove all your data as well as infection. You will get a completely new infection free PC.

How To Remove Sigrun Ransomware Virus From Your PC

Step 1Boot your computer in Safe mode.

Step 2 – Remove the infected registry entry files.

  • Click Windows Flag and R button together.


  • Type “regedit” and click OK button


  • Find and delete following entries.



HKEY_CURRENT_USERSoftwareMicrosoftInternet ExplorerMain “Default_Page_URL”

HKEY_LOCAL_Machine\Software\Classes\[Sigrun Ransomware]

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\[Sigrun Ransomware]

Step 3 – Remove From msconfig

  • Click Windows + R buttons simultaneously.


  • Type msconfig and press Enter


  • Go to Startup tab and uncheck all entries from unknown manufacturer.


Step 4 – Restart your computer normally.

Check your computer now. If the virus has gone then you can start using your computer. If the infection still remains then head to the next step.

Step 5 – System Restore

  • Insert Windows installation disk to CD drive and restart your PC.
  • While system startup, keep pressing F8 or F12 key to get boot options.
  • Now select the boot from CD drive option to start your computer.
  • Then after you will get the System Recovery Option on your screen.
  • Select the System Restore option from the list.
  • Choose a nearest system restore point when your PC was not infected.
  • Now follow the option on your screen to Restore your computer.

If the above manual methods didn’t removed Sigrun Ransomware virus then you have only option to remove infection using a malware removal tool. It is last and the only option that can easily and safely remove this nasty threat from your computer.


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