This article will aid you to remove .RYK File virus. Follow the ransomware removal instructions provided at the end of the article.
RYK (Ryuk) Ransomware Virus
Ryuk Ransomware, also known as .RYK File Virus will encrypt your data and demands money as a ransom to get it restored. Files will receive the .RYK extension as a secondary one, without any changes made to the original name of an encrypted file. The .RYK File Virus will leave ransomware instructions inside a text file. Keep on reading the article and see how you could try to potentially recover some of your locked files and data.
|Short Description||The ransomware encrypts files by placing the .RYK 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 Ryuk 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.|
Ryuk Ransomware Targets Hospitals During the COVID-19 Crisis
The greedy and heartless criminals behind Ryuk Ransomware keep targetting hospitals even when such organizations are extremely busy since the Coronavirus pandemic emerged. Interestingly enough, DoppelPaymer and Maze ransomware creators have halted attacks toward healthcare institutions during these troubling times.
If you are an individual, do NOT pay the criminals any sort of ransom. If you are seeking help as an institution, contact a local IT professional to deal with this attack faster. Unfortunately, there is still no decryption available for Ryuk ransomware.
March 2020 Ryuk Ransomware EMCOR Group Attack
A new contact email has been reported to be put in the new sample versions of the Ryuk ransomware. That new contact email address is the following: email@example.com. Do not contact cybercriminals as they only want your money.
A large-scale intrusion attack has been reported to have happened against the industry giant EMCOR Group which is an American company which is listed on the Fortune 500 list. According to the released reports the incident took place on February 15 and not a lot of information has been released to the public. The company has released a public message however it did not contain a lot of details.
The company disclosed that that not all of their internal network has been impacted — only certain computers. The impact of the incident has made financial damage — in their latest report of the last quarter of 2019 they have adjusted the figures.
EMCOR Group has more than 80 smaller companies which operate across 170+ countries and its last year revenue is reported as $9 billion revenue. These figures show that Ryuk has become one of the most damaging viruses of the last few months along with other advanced malware such as Maze and Nemty.
February 2020 Details About The New Ryuk Ransomware Attacks
A new major campaign with the Ryuk ransomware is currently being spread against victims. A new hacker contact email address is specified firstname.lastname@example.org. The new version contains a number of the advanced modules which we wrote about. This particular threat will not start immediately, bur sleep for a set period before launching step-by-step the various malware actions in the prescribed sequence.
This is done in order to bypass the functionality of security software and services — firewalls, anti-virus programs, sandbox environments, virtual machine hosts and etc. If a running engine associated with them is found then the virus will stop and delete itself in order not to raise awareness.
As soon as the Ryuk ransomware starts it will immediately start to spawn multiple processes — this is intended in order to access the system in multiple ways and make it very hard to stop running infections using manual methods. This new version is designed to infect in a stealth manner, possibly in order to be used against corporate networks. One of the distinct new additions that have been integrated in the Ryuk virus is to analyze the network environment and possibly to interact with other devices on the network.
There is the possibility that due to the fact that the Ryuk virus contains so many stealth-related modules that it can be used to drop additional threats such as Trojans, file wipers and cryptocurrency miners.
February 2020 Ryuk Ransomware New Findings
As more and more information becomes available about the infections, new findings indicate how one of the latest campaigns is set against the target users. Multiple criminal groups organize specially victim-centric campaigns tht in the end have resulted in a total revenue of about 3.7 million dollars. A very large part of the infections are set against enterprise networks — the businesses are far more likely to hold valuable data and pay the ransomware decryption fee. During the initial infection in some of the campaigns the analysts have uncovered that other malware have been used as well. Ryuk ransomware attacks have also used TrickBot and Emotet to send email spam campaigns to prospective victims.
Some of the specific vulnerabilities which are targeted by the Ryuk ransomware include the following:
- CVE-2013-2618 — This is a cross-site-scripting bug (XSS vulnerability) in Network Weathermap versions before 0.97b. The problem lies within editor.php which allows hackers to inject web scripts or HTML code.
- CVE-2017-6884 — This is an issue in Zyxel EMG2926 with firmware version V1.00(AAQT.4)b8 which is categorized as a command injection vulnerability. The problem lies in the nslookup diagnostic tool which can be exploited by the hackers.
- CVE-2018-8389 — This is a remote code execution in Internet Explorer.
- CVE-2018-12808 — A remote code vulnerability was discovered in Adobe Acrobat and Reader applications. The hackers are primarily using SPAM email messages which include scripts that exploit the applications.
February 2020 Ryuk Ransomware New Samples
February 2020 started with another development around the Ryuk ransomware. This time its a new sample that provides a new contact email address — email@example.com. An analysis of the file shows that the active campaign may be launched by a different hacking group than the previous samples. What’s interesting is that the new Ryuk virus has been able to stop some of the automated analysis tools during the initial checks. This means that it can allow the remote attackers to carry out Trojan operations — the overtaking of control over the machines, data theft and the installation of other viruses. What’s particularly noteworthy about the new release is that it can drop multiple virus files which makes recovery much more difficult.
January 2020 Ryuk Ransomware Update
In the end of January 2020 a new update to the Ryuk ransomware has been released which includes a signed certificate which will make it harder to differentiate it from malware as the system will trust it as a safe file. The certificate authority that has issued it has provided a long expiration date and all required parameters.
The virus engine contains many features that are also part of the previous samples. Some of the major components of the new releases include the following:
- Active Cryptocurrency Module — The security analysis shows that the new virus releases include a cryptocurrency module. It will take advantage of the available hardware resources by running a sequence of intensive and complex mathematical tasks. For each completed job the hackers will receive cryptocurrency directly to their wallets.
- Advanced Security Bypass — This particular update includes an extensive list of security bypass techniques that are called in order to hide the presence of the virus from both the operating system and anti-virus products.
- Trojan Functions — Not only will the Ryuk ransomware report back to the hackers through a secured connection, but will also exhibit banking Trojan functionality. This means that the engine will actively scan if the users are using any online banking services and attempt to steal the credentials or manipulate them. The reason why this is done is to conduct financial abuse crimes.
- Code Execution — The Ryuk ransomware is capable of executing dangerous scripts and codes on the infected machines. This is especially dangerous as the virus can obtain administrative privileges.
The information gathering process is rated as extremely in-depth and detailed. Contaminated hosts will usually have a lot of information hijacked and sent to the users.
One of the latest updates to the Ryuk ransomware adds in a Wake-on-Lan feature which is found only among the most dangerous computer threats. The security researchers have uncovered that the code has been placed among some of the latest versions of the virus. In live attacks the ransomware will turn on shut down devices as soon as a network has been impacted. This is mostly effective in business and enterprise scenarios where this functionality is used on a daily basis. Administrators typically rely on it to push updates or run scheduled tasks when the computers are not in use.
The mechanism is done by launching a virus-controlled sub process with a special argument called “8 LAN”. If the Wake-on-Lan action is successful then the Ryuk will attempt to mount the main drive (C:) over a network share. This will allow the main engine to encrypt files remotely and thus spread onto other machines. By following this mechanism in a matter of minutes the Ryuk ransomware can potentially infect hundreds of machines.
.RYK File Virus (Ryuk) – Distribution Techniques
The .RYK File ransomware might distribute itself via different tactics. A payload dropper which initiates the malicious script for this ransomware is being spread around the World Wide Web, and researchers have gotten their hands on a malware sample. If that file lands on your computer system and you somehow execute it – your computer device will become infected. Below, you can see the payload file of the cryptovirus being detected by the VirusTotal service:
Freeware which is found on the Web can be presented as helpful also be hiding the malicious script for the cryptovirus. Refrain from opening files right after you have downloaded them. You should first scan them with a security tool, while also checking their size and signatures for anything that seems out of the ordinary. You should read the tips for preventing ransomware located at the corresponding forum thread.
.RYK File Virus (Ryuk) – Technical Details
.RYK FilesVirus is actually ransomware, so it encrypts your files and opens a ransom note, with instructions inside it, about the compromised computer machine. The extortionists want you to pay a ransom fee for the alleged restoration of your data. The ransomware is a variant of an olderRyuk Virus which had a similar ransom note.
.RYK File Virus might make entries in the Windows Registry to achieve persistence, and could launch or repress processes in a Windows environment. Such entries are typically designed in a way to start the virus automatically with each boot of the Windows Operating System.
After encryption the .RYK File virus creates a ransom note inside a text file. The note is named RyukReadMe.txt as you can see from the below screenshot:
The note reads the following:
Your network has been penetrated.
All files on each host in the network have been encrypted with a strong algorithm.
Backups were either encrypted
Shadow copies also removed, so F8 or any other methods may damage encrypted data but not recover.
We exclusively have decryption software for your situation
More than a year ago, world experts recognized the impossibility of deciphering by any means except the oridinal decoder.
No decryption software is available in the public.
Antiviruse companies, researchers, IT specialists, and no other persons cant help you encrypt the data.
DO NOT RESET OR SHUTDOWN – files may be damaged.
DO NOT DELETE readme files.
To confirm our honest intentions.Send 2 different random files and you will get it decrypted.
It can be from different computers on your network to be sure that one key decrypts everything.
2 files we unlock for free.
To get info (decrypt your files) contact us at
No system is safe
Even if a note is shown, you should NOT under any circumstances pay any ransom sum. Your files may not get recovered, and nobody could give you a guarantee for that. Adding to that, giving money to cybercriminals will most likely motivate them to create more ransomware viruses or commit different criminal activities. That may even result to you getting your files encrypted all over again after payment.
.RYK File Virus (Ryuk) – Encryption Process
The encryption process of the .RYK File ransomware rather simple – every file that gets encrypted will become simply unusable. Files will get the .RYK extension after being locked. The extension is placed as a secondary one, without any changes made to the original name of an encrypted file.
A list with the known, targeted extensions of files which are sought to get encrypted is currently very small. Files which get encrypted have the following extensions:
→ .doc, .docx, .jpg, .jpeg, .xls, .xlsx, .pdf
The files used most by users and which are probably encrypted are from the following categories:
- Audio files
- Video files
- Document files
- Image files
- Backup files
- Banking credentials, etc
The .RYK File cryptovirus could be set to erase all the Shadow Volume Copies from the Windows operating system with the help of the following command:
→vssadmin.exe delete shadows /all /Quiet
In case the above-stated command is executed that will make the effects of the encryption process more efficient. That is due to the fact that the command eliminates one of the prominent ways to restore your data. If a computer device was infected with this ransomware and your files are locked, read on through to find out how you could potentially restore some files back to their normal state.
.RYK File (Ryuk) Virus – Update September 2019
September 2019 brings another update for the RYK ransomware virus. In the picture below you can see the current detections for the new variant on the VirusTotal platform:
The new e-mail addresses that the cybercriminals are using in the ransom notes are the following:
The ransomware seems to be booming and not faded as people would have hoped. Be wary when browsing the Internet and do backups to avoid being a victim of RYK ransomware virus.
.RYK File (Ryuk) Virus – Update August 2019
Throughout July and the beginning of August 2019 a new attack campaign with the Ryuk ransomware has been detected. It does not differ significantly from previous samples as it uses the same distribution tactics. Depending on the actual local conditions and hacking instructions various malicious actions can be made. As this is a modification of the base engine we anticipate that the hackng group behind it may have ordered the customization on the underground markets. An alternative is for them to have created the threat by themselves. This is done by taking the original source code and making the necessary changes.
When the malicious actions have all completed running the file encryption module will start. Once again using a built-in list of target file type extensions the Ryuk files virus will target the most common user data:
- Multimedia Files
- Restore Points & System Data
Again the .RYK extension will be applied to the files and the victims will be blackmailed to pay a decryption fee to the hackers.
.RYK File (Ryuk) Virus – Update June 2019
TheRyuk Ransomware has been updated to check the output of the “arp –a” parameter for specific IP address strings. In case these strings are found, the ransomware will not encrypt the files on that computer. Here are some of the partial IP address strings in question: 10.30.4, 10.30.5, 10.30.6, or 10.31.32.
Another update of Ryuk includes the ransomware comparing the computer name to the strings “SPB”, “Spb”, “spb”, “MSK”, “Msk”, and “msk”, and if those are found, the computer won’t be encrypted. It is most likely that all this is done so that the ransomware operators don’t target computers in Russia for encryption. As for the rest of its activities, they appear to be the same as in the previous version.
.RYK File (Ryuk) Virus – Update December 2019
According to the latest information from December 2019 released by EmsiSoft researchers:
The decryptor provided by the Ryuk authors will truncate files, cutting off one too many bytes in the process of decrypting the file. Depending on the exact file type, this may or may not cause major issues. In the best case scenario, the byte that was cut off by the buggy decryptor was unused and just some slack space at the end created by aligning the file towards certain file size boundaries. However, a lot of virtual disk type files like VHD/VHDX as well as a lot of database files like Oracle database files will store important information in that last byte and files damaged this way will fail to load properly after they are decrypted.
In simple words, this means that paying the ransom to cybercriminals will likely not result in the successful decrypton of enciphered data.
Remove .RYK File Virus (Ryuk)
If your computer system got infected with the .RYK File 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.
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.
- Guide 1: How to Remove Ryuk Ransomware from Windows.
- Guide 2: Get rid of Ryuk Ransomware from Mac OS X.
How to Remove Ryuk Ransomware from Windows.
Step 1: Boot Your PC In Safe Mode to isolate and remove Ryuk Ransomware
Step 2: Uninstall Ryuk 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.
Step 3: Clean any registries, created by Ryuk Ransomware on your computer.
The usually targeted registries of Windows machines are the following:
You can access them by opening the Windows registry editor and deleting any values, created by Ryuk Ransomware there. This can happen by following the steps underneath:
Step 4: Scan for Ryuk Ransomware with SpyHunter Anti-Malware Tool
Step 5 (Optional): Try to Restore Files Encrypted by Ryuk Ransomware.
Ransomware infections and Ryuk 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.
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.
Get rid of Ryuk Ransomware from Mac OS X.
Step 1: Uninstall Ryuk Ransomware and remove related files and objects
1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:
- 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 Ryuk 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:
You can repeat the same procedure with the following other Library directories:
Tip: ~ is there on purpose, because it leads to more LaunchAgents.
Step 2: Scan for and remove malware from your Mac
When you are facing problems on your Mac as a result of unwanted scripts, programs and malware, the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.
Step 3 (Optional): Try to Restore Files Encrypted by Ryuk Ransomware on your Mac.
Ransomware for Mac Ryuk Ransomware aims to encode all your files using an encryption algorithm which may be very difficult to decode, unless you pay money.
This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files, but only in some cases. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.
Ryuk Ransomware FAQ
What is Ryuk Ransomware ransomware and how does it work?
Ryuk 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 Ryuk Ransomware ransomware infect my computer?
Via several ways.Ryuk 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 Ryuk 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 .Ryuk Ransomware files?
You can't. At this point the .Ryuk 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 .Ryuk Ransomware files successfully, then do not despair, because this virus is still new.
One way to restore files, encrypted by Ryuk 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 ".Ryuk 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 .Ryuk 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 Ryuk 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 Ryuk Ransomware ransomware and then remove it without causing any additional harm to your important .Ryuk Ransomware files.
Also, keep in mind that viruses like Ryuk 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.