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.crimson Virus File (Crimson Ransomware) – Removal Guide

.crimson file extension is placed on all of your files? .crimson Virus File is also known as Crimson ransomware which locks files on a computer and demands money to be paid as a ransom for unlocking them.


Crimson Ransomware (.crimson Virus File)

The .crimson virus is a dangerous ransomware sample that has been created in the Java programming language. During the analysis it was found to mask itself as WSHRat, another dangerous malware which shows that the hackers have included advanced stealth protection properties. It has a complex infection sequence and will cause significant damage to the infected computers. The typical file encryption mechanism will be run afterwards which will result in .crimson extension processed data. The victims will then be blackmailed to pay a ransom decryption fee.

.crimson virus Summary

Name .crimson virus
File Extension .crimson
Type Ransomware, Cryptovirus
Short Description The ransomware encrypts files on your computer system and demands a ransom to be paid to allegedly recover them.
Symptoms The Crimson ransomware will encrypt your files by appending the .crimson extension to them.
Ransom Demanding Note DECODING_FILES.txt
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 .crimson virus.

.crimson Virus File – How Did It Infect My PC and What Happened?

The .crimson ransomware is a dangerous Java malware which has been created by an experienced hacking group. It has been recently discovered in an active infiltration campaign. One of the notable features which was detected during the analysis is the functionality of impersonating another malware — the WSHRat Trojan. However it appears to be a completely different threat which follows a non-standard infection algorithm. A major difference between this particular threat and other related infections is that it does not rely on any preinstalled Java runtime environments.

At the moment the collected samples are distributed using SPAM and phishing email messages — they contain an attached file in the JAR format which is the compiled executable binary of a Java program. When it is downloaded and run on a given computer the infection will follow. The file name in the current attack is called NEW ORDER.jar and it is the dropper component. It will retrieve a VBScript file which in turn downloads and installs the actual .crimson ransomware virus.

The first actions will include the initial deployment where the virus will install itself in the AppData folder making it very hard to detect and remove by the users. The Trojan will also install a Java Runtime environment by downloading it from a remote server and installing it into the affected computer. This environment will also be installed in the Windows Registry, the Trojan also also verify that the correct version is deployed. The ransomware will be deobfuscated as it is delivered in a hidden form. This function ensures that the installed security software will not detect it.

The .crimson virus is specially created to include an advanced Trojan module. It is designed to obtain critical information from the victims and their computers. It can access stored information from web browsers, email clients and other productivity software, as well as deploying a keylogger. This is a software utility that is designed to record the mouse strokes and keyboard input from the victims. The Trojan will overtake control of the machines via the download and installation of a legitimate remote desktop application called RDPWrap. It is an open-source tool that is preconfigured with the necessary configuration in order to automatically connect to the hacker-controlled server. The full list of the Trojan commands is the following:

  • reboot — Restarts the compromised machine
  • shutdown — Powers off the machine
  • uninstall — This will remove the persistent installation of the malware by deleting the scheduled task and autorun values that were installed via the initial deployment procedure
  • disconnect — This will close the connection to the remote server
  • down-n-exec — This will download a file from a remote URL and execute it on the system
  • update — This will disconnect from the server connection and start a program from the start menu
  • up-n-exec — This will execute a file by following a given name. The Trojan will automatically determine which Java runtime environment — this will act for files that have the extensions JAR, JS, VBS and WSF. Other files will be run using the command prompt.
  • remote-cmd — This will start a command using the Command prompt
  • power-shell This will start a command using PowerShell
  • file-manager — This will instruct the operating system’s file manager in order to navigate, download, upload, delete and open files
  • keylogger — This will log the keystrokes and report them to the hackers
  • o-keylogger — This will start an offline keylogger. It will record the keystrokes and save them to a text file
  • processes — This will create a listing of the running processes
  • startup-list — This will make the WMI to compile a list of the configured autorun entries
  • remote-screen — This will start the remote control process
  • rev-proxy — This will start a reverse proxy service
  • hrdp-new — This command will start a “Hidden RDP Installer” from a remote URL
  • hrdp-res — This command is the same as above, but it will receive a user name argument
  • chrome-pass — This command will extract the stored credentials from Google Chrome
  • foxmail-pass — This will extract the stored credentials from the Foxmail program
  • outlook-pass — This will extract the stored credentials from Microsoft Outlook
  • fox-pass — This will extract the stored credentials from Mozilla Firefox
  • tb-pass — This will extract account data from Mozilla Thunderbird
  • ie-pass — This will extract the stored credentials from the Internet Explorer browsers
  • all-pass — This will extract the stored credentials from all supported services
  • chk-priv — This will run a local system check which will notify the virus if it is an administrator
  • req-priv — This will run a command as an administrator
  • rw-encrypt — This will append the .crimson extension to the user data
  • rw-decrypt — This will remove the .crimson extension from the user data
  • show-msg — This option will display a ransom message using Notepad

The next step will the launching of the actual ransomware engine — it will encrypt user data according to a strong algorithm. The user files will be encrypted and renamed with the .crimson extension. Following this the hackers can opt to automatically display a ransom note or institute a lockscreen.

Remove .crimson Virus File

If your computer got infected with the .crimson Virus File, 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 .crimson virus Research

The content we publish on SensorsTechForum.com, this .crimson virus 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 .crimson virus 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 .crimson virus from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove .crimson virus


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 .crimson virus 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 .crimson virus 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 .crimson virus 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 .crimson virus 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 .crimson virus.

Ransomware infections and .crimson virus 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 .crimson virus from Mac OS X.

Step 1: Uninstall .crimson virus 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 .crimson virus:

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 .crimson virus. 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 .crimson virus. 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 .crimson virus 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 .crimson virus. 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 .crimson virus:


SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by .crimson virus.

Ransomware infections and .crimson virus 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.

.crimson virus FAQ

What is .crimson virus ransomware and how does it work?

.crimson virus 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 .crimson virus ransomware infect my computer?

Via several ways..crimson virus 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 .crimson virus 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 ..crimson virus files?

You can't. At this point the ..crimson virus 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 ..crimson virus files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by .crimson virus 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 "..crimson virus" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore ..crimson virus 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 .crimson virus 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 .crimson virus ransomware and then remove it without causing any additional harm to your important ..crimson virus files.

Also, keep in mind that viruses like .crimson virus 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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