SIGMA virus – How to remove? (Uninstall)

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Get rid of SIGMA virus

What is SIGMA virus?

Michael Gillespie discovered SIGMA ransomware recently, and it is known to be a virus that encrypts some of your data and ask you for money to decrypt these files. SIGMA is transferred by developers by spam emails as an attachment. The threat begins with claiming that if you didn’t open attachment, you would have to pay $3000 from your MasterCard. As some users save their credit card info on their browser, they might believe this trick and open the attachment to avoid paying the money. Once opened, SIGMA gets downloaded on your PC, and it works by encrypting your files by adding its signature extension“.Ka8E “. SIGMA then pops up two text files for you to guide you on how to retain your files and change your wallpaper as well.


The text files that pop up are meant to guide you about the process of decrypting your files and gaining access back to them. But this is not the only thing, and the bright light that you have seen has other purposes. Developers and hackers do this step to ask you to pay ransom fees in exchange for getting your files back. Using asymmetric encryption lately by hackers made it almost impossible to decrypt your files by the old methods that we all know. As we know, encryption creates two keys: One for encryption and one for decryption. They ask you to contact them to get the decryption key, and you get surprised to know that it costs $1000 in cryptocurrency like the BitCoin. Hackers dealing with viruses use cryptocurrency to clear off their road of tracking of making an illegal profit. Surprisingly, you can pay these hackers the money they asked for, and your computer is still infected with their virus, and you still have encrypted files. They can also ask you for more money to release your files. Unfortunately, there are no advanced tools that are capable of uninstalling SIGMA, so you can only get full access to your files again by a normal backup.

How did SIGMA got installed on my computer?

SIGMA spreads through computers through junk emails, unauthentic download sites, trojans, etc. As we mentioned earlier, spam emails are the most common way that transfers SIGMA. Hackers now script their viruses so that whenever they are downloaded, they run scripts in the background automatically to access your private information without your agreement. Hackers also bundle SIGMA with apps downloaded from nonauthentic sites so that users skip the download steps and install SIGMA on their computer.

How to get rid of (Uninstall) and remove SIGMA

Downloading software packages and apps from sources other than the original ones is a very dangerous step that many users don’t consider and they regret it when they can’t uninstall the viruses they downloaded. Download all your apps from their authentic sources even if you will pay money, which is still cheaper than paying for the decryption files. Do not open spam emails or download any attachment in your inbox and don’t be threatened easily as long as you didn’t open any attachment. Remove all of the unwanted apps on your computer and uninstall what might seem suspicious from your nonauthentic sites.

Despite the fact that this virus SIGMA virus is very malicious, it can be eliminated totally from your PC via manual or automatic removal. You can remove the virus manually only if you are experienced enough to do so as you might risk its recurrence. In this process, virus can get removed but need lots of knowledge and experience. On the other hand, a more safe method is to remove it by the aid of a software to guarantee to terminate this threat.

SIGMA virus Option A: Advanced system software is recommended to uninstall SIGMA virus from your PC.  Free scanner allows you to check whether your PC is infected or not.


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We recommend Advanced system program to remove virus SIGMA virus from your computer.

Option B: Remove SIGMA virus Manually (Risky & Complicated) For Technical Geeks only!

Steps To Remove SIGMA virus Manually

Windows 10 Internet Explorer Firefox Chrome

Click Start - Control Panel - Programs and Features

Select  suspicious program, and select "Uninstall" a Program.

Remove dangerous add-ons Open Internet Explorer, click on (IE menu) Gear icon,  the top right corner of the browser, then choose Manage Add-ons.

You will see a Manage Add-ons window. On that page look for suspicious plugin, select it, disable these entries by clicking Disable:

Change your homepage Url if it was altered by virus: Click "Apply" to save settings changes.

Reset Internet Explorer Click on the gear icon (menu) again and select Internet options. Go to "Advanced" tab, then select Reset.In the new window, select "Delete personal settings", and Click Reset. This action will remove SIGMA virus on Internet Explorer.

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To get Mozilla Firefox back to normal after got hijacked, use the following instructions:

First Remove suspicious extensions: Open Mozilla Firefox, then click the menu icon, and select "Add-ons" Extensions.

On meniu press on unwanted "add-ons" and select "Remove option". Repeat the same steps on other suspicious "add-ons"Click "Remove" to delete SIGMA virus


Change your homepage if it was affected by virus: Click on the menu (top right corner), select "Help" tab and then press on "Troubleshooting information" and new window will appear.Then select "Refresh Firefox" and popup will show up. Finally press on "Refresh Firefox"


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Use the guide below to remove suspicious malware from Chrome.

Delete suspicious plugins Open Google Chrome, click on the menu icon, and select "More Tools" Click "Extensions".Select SIGMA virus file and other suspicious plugins, Press "Remove" button to delete these entries.

Change your homepage Url, and default search engine if it was affected by SIGMA virus.Click on "Settings" icon on the right corner, then press "Settings" tab on appeared window, select "On Startup" tab. Then you will see Chrome startup link, select and delete it.

Now press settings, then click "Advanced" select "Reset and clean up" and pick first option "Restore settings to their original default" and popup will show up - Click "Reset settings"Your Chrome browser now startup fresh.

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