How to remove Sigma Ransomware (Virus Removal)

What is Sigma Ransomware?

Sigma Ransomware is a computer virus that encrypts files on your computer using RSA-2048 encryption, appends a new file extension to the end of encrypted filenames, and delivers a ransom note file named Readme.txt throughout the computer.

Sigma Ransomware

Once Sigma Ransomware has encrypted files, it will show the ransom note in attempt to gather a ransom from the victim. The ransom note explains what happened and how to purcahse a decryption key and special tool to decrypt files the way that the malware authors want them to.

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 wont be able to open them or view them properly. It does NOT mean they are damaged.

Solution

Well its 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

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 site will open then enter your GUID mentioned below and process.

[redacted]

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.

Like most ransomware infections, Sigma ransomware is typically distributed by email spam messages that contain malicious 7zip, 7z, rar, docx, and zip email attachments. Once the attachment is downloaded and executed it will spread the malware across the machine and begin its encryption process.

As the ransomware states in it’s note, the ransomware is also distributed by third-party downloads such as dubious or corrupt freeware, codecs, and updates.

Sigma Ransomware removal steps and file recovery

The removal steps on this page explains how to remove Sigma Ransomware and recover files encrypted by the computer virus. Follow each step below to remove this infection and secure your computer from malicious threats. On the bottom of this guide you will also find recovery and decryption software for various ransomware infections.

1. Remove Sigma virus with Malwarebytes


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  1. Open your browser window and download Malwarebytes 3.0 Premium or Malwarebytes Anti-Malware Free.
  2. Open the executable file (mb3-setup.exe) to begin installing Malwarebytes.
  3. Select your language, click Next, then select “I accept the agreement,” click the Next button several times, and then click the Install button to install Malwarebytes. Click Finish once the install process is complete.
  4. Open Malwarebytes and click the Scan Now button on the Dashboard to begin scanning your computer.
  5. Click the Quarantine Selected button once the scan is finished.
  6. If Malwarebytes says “All selected items have been removed successfully. A log file has been saved to the logs folder. Your computer needs to be restarted to complete the removal process. Would you like to restart now?” click the Yes button to restart your computer.

2. Remove trace files with HitmanPro


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  1. Open your browser window and download HitmanPro.
  2. Open the executable file (hitmanpro_x64.exe or hitmanpro_x32.exe) to begin installing HitmanPro.
  3. Click the Next button, check “I accept the terms of the license agreement,” and click the Next button again.
  4. On the Setup page select “Yes, create a copy of HitmanPro so I can regularly scan this computer (recommended)” and add your email address to the registration fields to begin the free trial.
  5. Click Next to begin scanning your computer.
  6. Once the Scan results are displayed click the Next button and click the Next button again on the Removal results page.

3. Clean up and repair issues with CCleaner


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  1. Open your browser window and download CCleaner Professional or CCleaner Free.
  2. Open the executable file (ccsetup.exe or other) to begin installing CCleaner.
  3. Click the Install button to begin stalling the program.
  4. Click Run CCleaner to open the program when installation is complete.
  5. Select the Cleaner tab and click the Analyze button.
  6. When the Analyze process is complete click the Run Cleaner button to clean all files.
  7. Next, select the Registry tab and click the Scan for Issues button to scan for issues in your registry.
  8. When the scan is complete click the Fix selected Issues button and Fix All Selected Issues button to fix the issues.
  9. Next, select the Tools tab and click Startup. Examine each area, search for suspicious entries, and delete any suspicious startup entries by selecting the entry and clicking the Delete button.
  10. Next, click Browser Plugins and search each internet browser for unwanted browser add-ons and extensions. Click the extension you want to delete and click the Delete button to remove it.

File Recovery Software

NAME DESCRIPTION DOWNLOAD
Shadow Explorer Restores lost or damaged files from Shadow Copies Download (Free)
Photorec Recovers lost files Download (Free)
Recuva Recovers lost files Download (Free) | Buy

Troubleshoot

Alternative methods are suggested if there are issues removing Sigma ransomware from an infected computer.

How to Restore your computer

If a restore point has previously been established on your machine you will be able to perform a system restore in order to restore your machine to a date and time before it was infected. You will lose files on your computer that were obtained prior to the restore point.

There are several options to restore your computer. Most computers have their own restore software that can be found by performing a search. Additionally, computers that run the Windows Operating System have a default restore program that can also be found by performing a search.

A boot screen that can be used to access options to restore your computer can be reached by rebooting your computer and pressing the F8 key once the manufacture screen is displayed.

How to Recover your computer to factory settings

A system recovery (or reset) will recover your computer to factory settings. You will lose the current programs and files on your computer.

There are several options to recover your computer to factory settings. Most computers have their own recovery software that can be found by performing a search. Additionally, computers that run the Windows Operating System have a default recovery program that can also be found by performing a search.

A boot screen that can be used to access options to restore your computer can be reached by rebooting your computer and pressing the F8 key once the manufacture screen is displayed.

Sean Doyle

Sean is a distinguished tech author and entrepreneur with over 20 years of extensive experience in cybersecurity, privacy, malware, Google Analytics, online marketing, and various other tech domains. His expertise and contributions to the industry have been recognized in numerous esteemed publications. Sean is widely acclaimed for his sharp intellect and innovative insights, solidifying his reputation as a leading figure in the tech community. His work not only advances the field but also helps businesses and individuals navigate the complexities of the digital world.

1 Response

  1. larry says:

    How to remove sigma ransomware? please help! so many malware programs out their not sure what one will do the job.

    Thank you

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