Infected with Sigma Ransomware? Need to decrypt your files?

What is Sigma Ransomware

Sigma Ransomware is a high-risk virus. Ransomware uses AES and RSA algorithms to encrypt user files and add a random extension to affected files. Actually, it appends a different suffix, that looks like this: .{random-symbols}. Malefactors currently use unknown e-mail addresses. Sigma Ransomware creates two files ReadMe.txt and ReadMe.html. They contain the following information:

What has happened to my files? Why i am seeing this?
All of your files have been encrypted with RSA 2048 Encryption. Which means, you won't be able to open them or view them properly. It does NOT mean they are damaged.

Solution
Well, it's quite simple only we can decrypt your files because we hold your RSA 2048 private key. So you need to buy the special decryption software and your RSA private key from us if you ever want your files back. Once payment is made, you will be given a decrypter along with your private key, once you run that, All of your files will be unlocked and back to normal.

So there are 2 ways to do this either you wait for a miracle and get your price doubled or follow instructions below carefully and get back your all important files.

Payment procedure
First try to open decrypter page in normal browser

http://yowl2ugopitfzzwb.onion.link

Wait a few seconds, and site will open then enter your GUID mentioned below and process.

660F187B8C71F670E76F70C7EDAFE4E7

If you failed to open links in normal browsers
Download a special browser called "TOR browser" and then open the given below link. Steps for the same are -

1. Go to https://www.torproject.org/download/download-easy.html.en to download the "TOR Browser".
2. Click the purple button which says "Download TOR Browser"
3. Run the downloaded file, and install it.
4. Once installation is completed, run the TOR browser by clicking the icon on Desktop.
5. Now click "Connect button", wait a few seconds, and the TOR browser will open.
6. Copy and paste the below link in the address bar of the TOR browser.

http://yowl2ugopitfzzwb.onion/

Now HIT "Enter"

7. Wait a few seconds, and the site will open then enter your GUID mentioned below and process.

660F187B8C71F670E76F70C7EDAFE4E7

If you have problems during installation or use of Tor Browser, please, visit Youtube and search for "Install Tor Browser Windows" and you will find a lot of videos.

Ransom is 0,1 BitCoins, that currently equals to $1000. However, this amount may vary depending on cryptocurrency exchange rate. Sigma Ransomware targets most important user data, which makes it effective for malefactors. These are MS Office documents, OpenOffice, PDF, text files, databases, photos, music, videos, image files, archives, web page files and other web files, educational, application and specialized files, and other files. Currently, files infected or encoded by this threat are non-decryptable, but there are certain methods to restore encrypted files manually. Use this article to remove Sigma Ransomware completely from Windows 10, 8, 7 and decrypt your files.

Sigma Ransomware

Update: Use following service to identify the version and type of ransomware you were attacked by: ID Ransomware. Also check following website for possible decryptor: Emsisoft Decryptors.

How Sigma Ransomware infected your PC

At this moment, we know that several e-mails are used to distribute .docx files with malicious macroses. E-mails are distributed all over the world. You can also get this ransomware on file-sharing networks, including torrent files. Ransom is asked to be paid in BitCoins, that also makes the task difficult for the police, as the user in this network is often anonymous. Encryption starts in the background. Way to protect your computer from such threats is to use antiviruses with crypto-protection like HitmanPro.Alert with CryptoGuard.

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 Sigma 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 Sigma 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 Sigma Ransomware:

Remove following registry entries:

no information

Remove following files and folders:

no information

How to decrypt files infected by Sigma Ransomware (random files)?

Use automated decryption tools

kaspersky rakhni decryptor for Sigma Ransomware

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

Download Kaspersky RakhniDecryptor

You can also try to use manual methods to restore and decrypt files.

Decrypt files manually

Restore the system using System Restore

system restore

Although latest versions of Sigma 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 – Sigma Ransomware by Sigma 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 encrypted files using shadow copies

shadow explorer gui

  1. Download and run Shadow Explorer.
  2. Select the drive and folder where your files are located and date that you want to restore them from.
  3. Right-click on folder you want to restore and select Export.
  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: Alexey Abalmasov

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