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Decrypt .crypo Files Encrypted by RotorCrypt Ransomware

This article has been created in order to help you by explaining what is the .crypo verson of RotorCrypt ransomware virus and how to decrypt files, encrypted with !decrfile@tutanota.com.crypo file extension for free.

A new version of the notorious RotorCrypt ransomware infection has been detected out in the wild. The ransomware virus aims to infect your computer and then encrypt the files in it, making them no longer able to be opened. The end goal of the virus is to set the .crypo file extension along with the e-mail decrfile@tutanota.com e-mail for contact. This has been done with the purpose to get the victims to contact the cyber-crooks on their e-mail and get them to pay a hefty ransom fee in BitCoins in order to get the encrypted files decrypted and working once again. Luckily however, there is a decryption available for the .crypo family of ransomware viruses and you can recover your files for free, if you read this article carefully and follow the instructions within it.

Threat Summary

Name .crypo Files Virus
Type Ransomware, Cryptovirus
Short Description A variant of the RotorCrypt ransomware virus family. Aims to encrypt the files on the infected computers and then ask victims to pay ransom to get them back.
Symptoms Files are encrypted with an added !decrfile@tutanota.com.crypo file extension.
Distribution Method Spam Emails, Email Attachments, Executable files
Detection Tool See If Your System Has Been Affected by malware


Malware Removal Tool

User Experience Join Our Forum to Discuss .crypo Files Virus.

How Does RotorCrypt .crypo Infect

The infection process of this virus is rather simplistic. The cyber-criminals have managed to likely get their hands on a list of e-mails which are used by real people and these e-mail addresses are being spammed with malicious e-mail spam messages. Such e-mail spam messages often carry an e-mail file extension in them, from the likes of fake documents (invoices, receipts, etc.). Some e-mails may even contain web links that may lead the victim to a malicious JavaScript execution which leads to the infection.

In some occasions, malicious Microsoft Office documents are used with malicious macros embedded within them. Such e-mails often get the user to click on “Enable Content” or similar “Enable Editing” buttons on the document, which cause the infection and the following chain of activities to be triggered:

In addition to those, there may be more passive methods for infection via this ransomware virus. Such are often believed to be fake setups of programs, game patches, cracks, key generators or software license activators which may be uploaded on malicious websites all over the world.

.crypo Files Virus – Analysis and Background

The main payload of this ransomware infection has been reported(https://www.virustotal.com/#/file/4213288a599af1981743832866461d735f2b25d80869a9da5f75ad1357449cda/) by malware researchers to be named with a random name and have the following parameters:

→ SHA-256: 4213288a599af1981743832866461d735f2b25d80869a9da5f75ad1357449cda
Size: 77.5 KB

Detected as the latest version of RotorCrypt ransomware, this malware has had quite some activity over time. When it infects a targeted computer, the .crypo virus begins a scan in order to establish whether or not the malware has been ran beforehand on the victim’s computer. If so, the virus may shut down.

Another check the virus performs is the OS version and if it is supported, it runs an obfuscated payload, which may consist of more than one files, that may be dropped in the following Windows folders:

  • %AppData%
  • %Local%
  • %LocalLow%
  • %Temp%
  • %Common%

The main payload files htat have been detected so far in association with this ransomware virus have been reported by researchers to be located in various places on infected computers with different names, often random ones with uppercase and lowercase letters. Here are some of the malicious files, reported with associations to different variants of this ransomware virus:

→ %TEMP%\.exe
%LOCALAPPDATA%\Microsoft Help\DNALWmjW.exe
%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\jHlxJqfV.lnk

In addition to dropping the malicious files, this ransomware infection also aims to delete the shadow volume copies on the computers that have been infected by it. This is done by .crypo having to assume administrator privileges on the victim’s PC and run a script that execute shte vssadmin and bcedit commands in Windows Command Prompt in the background of the victim’s computer:

→ vssadmin.exe delete shadows /all /Quiet
bcdedit.exe /set {current} bootstatuspolicy ignoreallfailures
bcdedit.exe /set {current} recoveryenabled no

RotorCrypt has had quite the variants over the past few years and is actually an updated variant of GomaSom ransomware. If we had to align them chronologically, here are all of the previous updated variants of the virus which were detected since the June 2015:

Variants from 2015:

Variants from 2016

Variants from 2017

!-=solve a problem=-=grandums@gmail.com=-.PRIVAT66
!==solve a problem==stritinge@gmail.com===.SENRUS17

Variants from 2018
!==SOLUTION OF THE PROBLEM==blacknord@tutanota.com==.Black_OFFserve!

.crypo Files Virus Encryption Process

The encryption of this ransomware has not changed much since the first version appeared before. RotorCrypt still uses the RSA encryption algorithm in order to encode files on the infected computers. This cipher, known as Rivest-Shamir-Adleman generates a private and public keys which are unique and the files have bytes of them encrypted with the cipher, not the whole file. The files that are encrypted by this version of the ransomware may be of the following file types:

→ .1cd, .avi, .bak, .bmp, .cf, .cfu, .csv, .db, .dbf, .djvu, .doc, .docx, .dt, .elf, .epf, .erf, .exe, .flv, .geo, .gif, .grs, .jpeg, .jpg, .lgf, .lgp, .log, .mb, .mdb, .mdf, .mxl, .net, .odt, .pdf, .png, .pps, .ppt, .pptm, .pptx, .psd, .px, .rar, .raw, .st, .sql, .tif, .txt, .vob, .vrp, .xls, .xlsb, .xlsx, .xml, .zip

After the encryption has complete, the files assume the following appearance:

Remove RotorCrypt Ransomware and Decrypt .crypo Files

In order to provide you with the most efficient way to remove this malware and decrypt your files, we have decided to separate the removal instructions in two phases, phase 1 being the removal and 2 being the decryption instructions. In case you have already gotten rid of this malware you can go right ahead by jumping to the decryption instructions for your files.

Phase 1: Remove RotorCrypt

In order to fully erase RotorCrypt from your computer system, we have prepared manual and removal instructions which you can follow below. In the even that you are experiencing difficulties in manual removal, experts often advise to perform the removal automatically, preferably by downloading an advanced anti-malware software, which will make sure this malware is fully gone from your system and it remains protected against future infections as well.

Ventsislav Krastev

Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.

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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

Windows Mac OS X

How to Remove .crypo Files Virus from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove .crypo Files 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 .crypo Files 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 .crypo Files 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 .crypo Files 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 .crypo Files 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.

Step 5 (Optional): Try to Restore Files Encrypted by .crypo Files Virus.

Ransomware infections and .crypo Files 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 reccomended 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.

Windows Mac OS X

Get rid of .crypo Files Virus from Mac OS X.

Step 1: Uninstall .crypo Files 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 .crypo Files 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 .crypo Files 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 .crypo Files 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 .crypo Files 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 .crypo Files 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 .crypo Files Virus:


SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by .crypo Files Virus.

Ransomware infections and .crypo Files 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 reccomended 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.

.crypo Files Virus FAQ

What is .crypo Files Virus ransomware and how does it work?

.crypo Files 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 .crypo Files Virus ransomware infect my computer?

Via several ways..crypo Files 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 .crypo Files 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 ..crypo Files Virus files?

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

One way to restore files, encrypted by .crypo Files 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 "..crypo Files 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 ..crypo Files 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 .crypo Files 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 .crypo Files Virus ransomware and then remove it without causing any additional harm to your important ..crypo Files Virus files.

Also, keep in mind that viruses like .crypo Files 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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