Home > Ransomware > .gamma CrySiS Ransomware – Remove + Restore Files

.gamma CrySiS Ransomware – Remove + Restore Files

Security researchers have detected a new iteration of the CrySiS Ransomware which processes victim files with the .gamma extension. This new version follows the well-known behavior patterns and can cause many dangers to the infected hosts. It is based on the same modular platform and the criminals can create custom copies depending on the targets.

Our article provides an overview of the virus operations and it also may be helpful in attempting to remove the virus.

Threat Summary

Name CrySiS Ransomware
Type Ransomware, Cryptovirus
Short Description The ransomware encrypts files by placing the .gamma extension on your computer system and demands a ransom to be paid to allegedly recover them.
Symptoms The ransomware will encrypt your files and leave a ransom note with payment instructions.
Distribution Method Spam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by malware


Malware Removal Tool

User Experience Join Our Forum to Discuss CrySiS Ransomware.
Data Recovery Tool Windows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

.gamma Ransomware – Update February 2019

In February 2019 it has become known that the attacks of the .gamma Files Virus (a Dharma/CrySiS ransomware variant) are increasing. The attacks successfully exploit the RDP (Remote Desktop Protocol) on systems that have it open and used. Disabling RDP and tweaking it a bit is enough to prevent access for the ransomware from this attack vector.

CrySiS Ransomware – Distribution Tactics

The CrySiS ransomware is being distributed using various tactics. The hackers behind it seem to have launched a global network campaign against computer users of all types — both individual users, companies and enterprise clients. A common tactic is to use a SPAM email campaign directly against the targets incorporating phishing tactics. They are designed to appear as messages that have been sent by popular Internet services or sites that the users might use. The emails can either contain the virus files (or payload carriers) as direct attachment or they are linked in the body contents.

A similar strategy is to construct download sites — they represent fake download sites, landing pages and software Internet portals.

These two methods are used to distribute the infected payload carriers of which there are two popular types:

  • Documents — The hackers can embed the virus installation code in payload carriers such as popular document types: rich text documents, spreadsheets, databases and presentations. When they are opened by the victims a message prompt will appear asking the users to enable the built-in macros. If this action is allowed the virus installation will commence.
  • Software Installers — The criminals behind the CrySiS ransomware may integrate the virus into application installers of popular software. The criminals typically choose programs that are chosen by end-users — creativity suites, system utilities and productivity solutions.

In certain cases the CrySiS ransomware files and the made payloads can be spread over file-sharing networks such as BitTorrent. These systems are widely used to distribute pirate content or legal creative products. The underground trackers primarily spread software and applications which are often CrySiS ransomware strains.

Advanced infection methods can include the set up of attack campaigns via browser hijackers. They are set up to be compatible with the most popular web browsers. The plugins are uploaded to their relevant repositories. The relevant descriptions often include promises of enhancing the browsers or adding new functionality. When they are installed the typical behavior pattern would be to modify the default settings in order to redirect the users to a hacker-controlled page. This is done by manipulating the default home page, search engine and new tabs page. When this step is complete the ransomware infection will follow.

CrySiS Ransomware – In-Depth Analysis

The CrySiS ransomware follows the set behavior pattern of previous iterations. The infiltrations begin with an information gathering module which is set to automatically harvest strings that can be categorized into two main groups:

  • Personal Data — The hackers will acquire information that can be used to expose the identity of the victims. A data set can contain any of the following strings: their name, address, phone number, location, interests and etc.
  • Campaign Metrics — The other CrySiS ransomware data extraction category is related to metrics that can be used to optimize the attack campaigns. The bulk of the hijacked data is made up of a reports of the installed hardware reports, user settings and operating system values.

This particular ransomware family can also be identified as Dharma.

The next module that can take advantage of the hijacked data is the stealth protection one. It is used to protect the CrySiS ransomware from security software that can interfere with the virus operations. The list includes anti-virus engines, virtual machine hosts and debug environments. Depending on the exact configuration the applications themselves may be deleted.

At this stage the CrySiS ransomware will have full control of the host system — the modular engine will be able to hook up to system processes, create ones of its own and set up administrative privileges for them.

Many popular virus versions choose to continue with the Windows Registry modifications — both changing the already existing ones and creating new entries belonging to the virus code. Note that if any operating system related strings are modified then this can cause overall performance issues while changes to individual applications may render certain functions non-available. The creation of custom entries is related to another technique — the persistent threat installation. Such malware infections will be started automatically once the computer is powered on and may additionally block access to the boot recovery menu.

Further malicious activity my include the removal of sensitive data such as System Restore Points and Shadow Volume Copies which are important when restoring the computers. If this action is done then the victim users will need to resort to a professional backup recovery solution, refer to our instructions for mode details on this.

Another popular virus step is the deployment of a Trojan module. Like other similar viruses the mechanism remains the same, the client will establish a secure connection to a hacker-controlled address. This will allow the hackers to spy on the victims in real-time, as well as take over control of their machines and deploy other threats. Some of the popular payloads that are dropped include other viruses or cryptocurrency miners. They have become very popular of late as they can process complex calculations and when the results are reported to the servers digital currency will be transferred over to the hacker’s wallets automatically.

As this is a new version of the CrySiS Ransomware family we anticipate that the various modifications of it can be customized in each target campaign. Newer versions are expected as the CrySiS main engine code can be acquired through the hacker underground forums.

CrySiS Ransomware – Encryption Process

There is no large difference in the encryption engine operations of this CrySiS ransomware strain in comparison to previous ones. Sensitive user data is encrypted with a powerful cipher and governed by a list of target file type extensions. The following example data may be affected:

  • Archives
  • Backups
  • Documents
  • Images
  • Music
  • Videos

Like previous versions the ransomware will mark the processed files with a specific extension — “.id-%ID%.[bebenrowan@aol.com].gamma.

This means that the the files will contain the unique user ID which is made of information harvested through the data stealer module. As always the .gamma extension files will also be mentioned in the special ransomware note created in the FILES ENCRYPTED.txt file.

Remove CrySiS Ransomware Virus and Restore .gamma Files

If your computer got infected with the CrySiS ransomware virus, you should have a bit of experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect other computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.

Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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Attention! SensorsTechForum strongly recommends that all malware victims should look for assistance only by reputable sources. Many guides out there claim to offer free recovery and decryption for files encrypted by ransomware viruses. Be advised that some of them may only be after your money.

As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.

How to recognize trustworthy sources:

  • Always check "About Us" web page.
  • Profile of the content creator.
  • Make sure that real people are behind the site and not fake names and profiles.
  • Verify Facebook, LinkedIn and Twitter personal profiles.


with Anti-Malware
We recommend you to download SpyHunter and run free scan to remove all virus files on your PC. This saves you hours of time and effort compared to doing the removal yourself.
SpyHunter 5 free remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy

About the CrySiS Ransomware Research

The content we publish on SensorsTechForum.com, this CrySiS Ransomware how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific malware and restore your encrypted files.

How did we conduct the research on this ransomware?

Our research is based on an independent investigation. We are in contact with independent security researchers, and as such, we receive daily updates on the latest malware and ransomware definitions.

Furthermore, the research behind the CrySiS Ransomware ransomware threat is backed with VirusTotal and the NoMoreRansom project.

To better understand the ransomware threat, please refer to the following articles which provide knowledgeable details.


1. How to Recognize Spam Emails with Ransomware
2. How Does Ransomware Encryption Work?
3. How to Decrypt Ransomware Files
4. Ransomware Getting Greedier and Bigger, Attacks Increase by 40%
5. 1 in 5 Americans Victim of Ransomware

Windows Mac OS X

How to Remove CrySiS Ransomware from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove CrySiS Ransomware


Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows Key + R.

2. The "Run" Window will appear. In it, type "msconfig" and click OK.

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".

Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.

4. When prompted, click on "Restart" to go into Safe Mode.

5. You can recognise Safe Mode by the words written on the corners of your screen.

Step 2: Uninstall CrySiS Ransomware and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.

2. In the field type in "appwiz.cpl" and press ENTER.

3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"

Follow the instructions above and you will successfully uninstall most programs.

Step 3: Clean any registries, created by CrySiS Ransomware on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by CrySiS Ransomware there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.

3. You can remove the value of the virus by right-clicking on it and removing it.

Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for CrySiS Ransomware with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.


If any threats have been removed, it is highly recommended to restart your PC.

Video Guide for Automatic and Fast Removal

Step 5 (Optional): Try to Restore Files Encrypted by CrySiS Ransomware.

Ransomware infections and CrySiS Ransomware aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the recommended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on the top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Step 6: How to Restore Files Encrypted by Ransomware (Video Guide)

Windows Mac OS X

Get rid of CrySiS Ransomware from Mac OS X.

Step 1: Uninstall CrySiS Ransomware and remove related files and objects

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy

1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:

2. Find Activity Monitor and double-click it:

3. In the Activity Monitor look for any suspicious processes, belonging or related to CrySiS Ransomware:

Tip: To quit a process completely, choose the “Force Quit” option.

4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.

5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to CrySiS Ransomware. If you find it, right-click on the app and select “Move to Trash


6. Select Accounts, after which click on the Login Items preference.

Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to CrySiS Ransomware. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7. Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove CrySiS Ransomware via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as CrySiS Ransomware. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents

Tip: ~ is there on purpose, because it leads to more LaunchAgents.

Click the button below below to download SpyHunter for Mac and scan for CrySiS Ransomware:


SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by CrySiS Ransomware.

Ransomware infections and CrySiS Ransomware aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the recommended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

CrySiS Ransomware FAQ

What is CrySiS Ransomware ransomware and how does it work?

CrySiS Ransomware is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.

Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.

How does CrySiS Ransomware ransomware infect my computer?

Via several ways.CrySiS Ransomware Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.

This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.

After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.

Another way, you may become a victim of CrySiS Ransomware is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.

How to open .CrySiS Ransomware files?

You can't. At this point the .CrySiS Ransomware files are encrypted. You can only open them once they are decrypted.

Decryptor did not decrypt my data. What now?

Do not panic and backup the files. If a decryptor did not decrypt your .CrySiS Ransomware files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by CrySiS Ransomware ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.

How Do I restore ".CrySiS Ransomware" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .CrySiS Ransomware files.

These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.

How do I get rid of CrySiS Ransomware ransomware virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate CrySiS Ransomware ransomware and then remove it without causing any additional harm to your important .CrySiS Ransomware files.

Also, keep in mind that viruses like CrySiS Ransomware ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.

What to Do If nothing works?

There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:

  • Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
  • Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
  • Also, check if some of the files that were encrypted it can be re-downloaded from the web.
  • Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
  • You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.

More tips you can find on our forums, where you can also asks any questions about your ransomware problem.

How to Report Ransomware to Authorities?

In case your computer got infected with a ransomware infection, you can report it to the local Police departments. It can help authorities worldwide track and determine the perpetrators behind the virus that has infected your computer. Below, we have prepared a list with government websites, where you can file a report in case you are a victim of a cybercrime:

Cyber-security authorities, responsible for handling ransomware attack reports in different regions all over the world:

Reports may be responded to in different timeframes, depending on your local authorities.

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