How to remove Sigrun virus and restore encrypted files

This item was created to help users to get rid of Sigrun encrypting malware. Here, we’ve assembled everything that you should learn about Sigrun deletion, in conjunction with knowledge on file restoration. Here we have the overall tips on ransomware which may assist you to evade problems next time.

Sigrun ransomware virus

Sigrun is the worst misfortune that might meet you on the Net It is a typical plunder, only without true pillagers around you: web-criminals penetrate your device and grab everything they wish, casting you aside with a crippled system that contains only useless files. Sigrun ransomware is the clearest example of this type of viruses: it’s not difficult to find and very difficult to defeat, but we can assist you with it. In our article, we want to tell you what is Sigrun and how it infected your system. We will make it clear to you what measures you should take to avoid encrypting virus' infestation, and how you can get your files back. Remember that some these programs will never get decrypted, and if you've got one – your information might be already lost for good. Rarely even hackers make an error to create the way to beat their virus or to turn the tide. The customer may be protected by certain options of the system, and we will explain to you how you can take advantage of it.

What is Sigrun ransomware

The point is that all ransomware exploit the famous encoding algorithms, such as the AES and the RSA. These two are very complicated and can’t be broken. Well, you might decipher them, having a century of regular computer’s operation time or several years of work on the very efficient machine of the world. We're sure that neither of these variants suits a user. It's time to understand that ransomware are easy to avoid, but if it’s already on your computer – you’re in trouble.

The encoding viruses, AKA ransomware, are the programs that infest customers' systems and spoil their files to demand money from them. More often than not, fraudsters get on user's PC via email spam or zero-day Trojans. E-mail spam isn't difficult to define – it will be a message suddenly, and there will be a file attached to it. In case of zero-day Trojans, it’s way harder – you won’t realize what it will be until you get penetrated so that the most effective method is to automatically update the OS and other utilities that you have in it.

The program structure of ransomware isn't really complex, yet even the sloppiest one is highly effective, and we will tell you why. They all apply the very complex encryption algorithms. Viruses' aim is not to actually steal the files. All it has to do is to infest the system, encrypt your data and remove the originals, placing the encoded copies in their place. The files are unreadable afterwards. You cannot read them and can’t recover them. There are few techniques to reconstruct the information, and they all are described in our item.

As soon as the ciphering is performed, ransomware shows you a ransom message, and as it popped up – you can be certain that the files are corrupted. There's only one thing you can do now - to remove ransomware from the machine and attempt to restore the data. We have said “try” as the chances to achieve success with no decryption utility are critically low.

Sigrun removal guide

It’s significant to remove ransomware until you start working on data restoration because if it stays on the PC – it will go on encrypting every single file which gets into the PC. Even more - any flash drive you're sticking into the infested PC will become infected also. We know that it's bad for you, so just get rid of Sigrun through adhering this easy removal guide. Don't forget that the uninstallation will not decrypt your files, and after doing it, you will not be able to pay money to fraudsters. It will be wise that as each dollar received is making swindlers more confident in fraud schemes and gives them more budget to produce more ransomware programs. One more point is that if you are dealing with scammers, you have no warrant that the information will be recovered after you pay the ransom. They have already wasted your data, and we don't think that you lean to transfer them some funds after that.

Removal instruction

Step 1. Boot into Safe mode

Safe mode

Start -> Msconfig.exe

Safe mode. Step 1

On the tab Boot select Safe boot

Safe mode. Step 2

Step 2. Check Startup folder

Start -> Msconfig.exe ->Disable unknown programs in the Startup tab


Step 3. Check hosts file

Modify hosts file, that located in C:\Windows\System32\drivers\etc\ .

Hosts file.Step 1

Open the file with Notepad and delete suspicious strings.

Hosts file.Step 2

It has to look like this:

Hosts file.Step 3

Step 4. Scan the system with antiviral scanner


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Step 5. Disable Safe mode

Start -> Msconfig.exe ->Disable Safe boot in the Boot tab

Deactivate Safe mode

Sigrun decryption instruction

When the ransomware is deleted from your PC, and you're certain about it, you need to consider the decryption methods. Primarily, we want to mention that the sole 100% effective method is to have the previously saved copies. If you had the copies of the information and Sigrun is totally eliminated – just delete the ciphered information and use the copies. In case you have no previously saved copies – the chances to get the data are significantly lower. The only chance to get there is the Shadow Volume Copies. We're saying about the basic tool of Windows, and it saves every single bit of information that was altered. They may be found with the help of custom recovery tools.

Unfortunately, all modern encrypting programs might erase these copies, but if you're accessing the system from an entry with no administrator rights, the virus simply had no ability perform that not having the permission. You may recall that a few minutes prior to the display of a scammer's message you've seen a different dialogue window, asking to apply changes to your OS. If you've cancelled these changes – the SVC weren't removed, so they can be accessed via the utilities as Recuva or ShadowExplorer. You can simply locate each of them on the Internet. Both of them have their official websites, so you better download them from there, with step-by-step guides. In case you require more explanations on this topic – you may read our article about data recovery: article about files decryption.

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