How to remove Sigma virus and restore encrypted files

This entry was created to assist our readers to uninstall Sigma encrypting malware. On this page, we’ve assembled all that you should know about Sigma removal, in conjunction with wittings on the decryption of spoiled files. We also provide the overall information about ransomware that might help you to avoid troubles in future.

Sigma ransomware virus

An encrypting program is the worst thing which might meet you on the Internet It's a clear plunder, only without living pillagers involved: ransomware owners penetrate the PC and take anything they want, leaving a user with a crippled system, filled with encoded data. Sigma virus is the purest instance of this type of viruses: it’s easy to get and very hard to beat, but there are some measures you should take. In this article, we will explain to you what is ransomware and how it infested your workstation. We'll clarify to you how you can avoid encrypting virus' infection, and how you can decrypt the files. Remember that some the ransomware won't ever get defeated, so one of them is in your system – the data may be already lost forever. Sometimes hackers make an error to develop the switch to neutralize their virus or to reverse the caused harm. The victim might be guarded by some options of his PC, and we'll explain to you how to apply it.

What is Sigma ransomware

The encrypting programs, AKA ransomware, are the viruses that infect your PC's and encrypt their files to demand a ransom from them. Typically, hackers get on customer's device with the help of malspam campaigns or zero-day Trojans. Malicious message isn't difficult to recognize – you'll receive it without any notice, and it will have some files attached to it. When it comes to 0-day vulnerabilities, it’s way harder – you won’t realize what it is until the device gets taken over which means that the best way is to automatically check for the updates the OS and other programs that you have in it.

Common encrypting viruses aren’t overly complex in their code, yet even the clumsiest one is extremely dangerous, and we’ll prove our point. The catch is about the mechanisms of encryption. Ransomware doesn't physically grab the information. All it needs to do is to get into the hard drive, spoil your data and eliminate the originals, putting the encrypted copies instead of them. There's no use of that files after that. You cannot read them and can’t repair them. There are several methods to repair the files, and they all are defined in our entry.

The point is that the common viruses use the famous encoding algorithms, known as the RSA and the AES. They are very complex and can’t be deciphered. Actually, you can break them if you have fifty years of regular computer’s operation time or a few years of work on the very productive computing device in the world. We don't think that any of these variants suits a user. We will explain to you that ransomware are easy to avoid, but if it’s already in the system – you are in trouble.

When the job is done, ransomware gives you a ransom note, and as you see it – it's too late. There's only one turn you can take now - to delete ransomware from the machine and concentrate on the data restoration. We've said “attempt” because the chances to achieve success not having a decryption program are critically low.

How to remove Sigma

It’s very important to eliminate a virus before you start working on file restoration as if it sticks in your system – it will go on encrypting any file which enters the system. You should understand that any data storage you're linking to the corrupted PC will get encrypted as well. We know that it's not great for you, so simply eliminate Sigma by adhering this useful advice. Don't forget that the deletion won’t decrypt the information, and if you do it, you won’t be able to pay the ransom. It will be smart that as every ransom earned is making hackers more positive in what they do and increases their money to produce other encrypting programs. The important thing is that when you are forced to deal with hackers, they might just take the ransom and ignore you. They have just wasted your files, and if you want to transfer them some funds on top of 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

Sigma decryption instruction

When you delete Sigma from your computer, and you triple-checked it, you should think about the restoration techniques. From the very beginning, we should say that the most efficient way is to have the security copies. If you have the copies of the information and the virus is completely uninstalled – don't worry. Erase the encrypted data and upload the copies. If you had no previously saved copies – the chances to get your files are way lower. The single method to repair them is the Shadow Volume Copies. We're saying about the basic service of Windows, and it saves every single file that was modified. You might reach them via custom recovery programs.

Of course, the high-quality encrypting programs may remove these files, but if you're working from an account that has no administrator rights, Sigma just had no ability perform that without your order. You may remember that a few minutes prior to the display of a swindler's message there was another dialogue window, offering to apply changes to your device. If you've blocked those alterations – your SVC weren't erased, and you can access them and repair the information via the programs as ShadowExplorer or Recuva. You may simply locate them both in the Web. It's better for you to load them from the webpages of their creators, with step-by-step guides. In case you want more information on this topic – simply look at the extended article about information recovery: article about files decryption.

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