Here you will find out more about the issues caused by a ransomware infection dubbed .cat virus files. At the end of the article, there is a detailed guide on how to remove the infection and secure the PC. If you want to try to recover locked .cat files with the help of alternative methods you will find some of them in one of the steps in the guide.
.cat Virus Files
The infection called .cat virus files is actually a data locker ransomware. Is was reported as a strain of the Xorist threat family which means that it will contaminate essential system settings, disrupt PC security and encode personal files to extort a ransom. Since the encryption module of the Cat virus is set to use a sophisticated cipher algorithm, all files that appear with the extension .cat in their names remain completely inaccessible.
Cat Virus Summary
| Name | Cat also known as Win32:Filecoder-M [Trj] (Avast), Trojan.Ransom.AIG (BitDefender), Trojan-Ransom.Win32.Xorist.lk (Kaspersky) |
| Type | Ransomware, Cryptovirus |
| Ransom Note | КАК РАСШИФРОВАТЬ ФАЙЛЫ.txt |
| Short Description | The threat encrypts target files stored on your computer, marks them with the .cat extension and extorts a ransom by displaying a ransom message. |
| Symptoms | Important files are encoded and renamed with .cat extension. You cannot open them. Hackers demand a ransom payment. |
| Distribution Method | Spam Emails, Email Attachments |
| Detection Tool |
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.cat Virus In Details
There is a new Xorist ransomware strain and it is the Cat virus. Currently, samples of this ransomware have been circling the web to find their victims. The most probable spread technique is malspam.
Malspam enables hackers to deliver malicious code on users’ devices with the help of specially crafted email messages. Such email messages usually have one or more of the following traits:
- A link to a compromised web page that hosts the ransomware payload on it.
- Or a malicious file attachment that is presented as legitimate document.
The moment you open an infected web page in your browser, it may download and execute ransomware infection files directly on the PC. As regards file attachments, they could appear as .rar or .zip archives that contain the malicious code that will trigger an infection with Cat ransomware.
When the infection process with the so-called .cat virus files begins, the virus drops additional malicious files on the system. It is likely that the virus will drop these files in some of the following folders:
- %AppData%
- %Local%
- %LocalLow%
- %Roaming%
- %Temp%
As a result of infection with the Cat ransomware virus, your PC will be more vulnerable to additional malware attacks until all ransomware files are uninstalled and deleted.
Ransomware programs like Cat contaminate the settings of various essential system components to complete the attack to the end. Affected by the threat are likely to be some crucial registry keys stored by the Registry Editor.
To be more precise the keys Run and RunOnce may be infected by .cat virus. Here are the exact registry locations that should be checked for malicious entries during the removal process:
→ 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
The reason for the contamination of these keys is their ability to execute various files and apps automatically. So once Cat ransomware has its malicious entries added under the Run key, it becomes able to load automatically every time you start the infected operating system.
When it’s turn to the data encryption stage, Cat ransomware utilizes strong cipher algorithms to encrypt personal files. Similar to its predecessors – Mame vse and Ssghl, Cat virus is likely to scan infected systems for all files that have one of following extensions. Whenever a match is available it encodes the file by transforming parts of its original code:
→.zip, .rar, .7z, .tar, .gzip, .jpg, .jpeg, .psd, .cdr, .dwg, .max, .bmp, .gif, .png, .doc, .docx, .xls, .xlsx, .ppt, .pptx, .txt, .pdf, .djvu, .htm, .html, .mdb, .cer, .p12, .pfx, .kwm, .pwm, .1cd, .md, .mdf, .dbf, .odt, .vob, .ifo, .lnk, .torrent, .mov, .m2v, .3gp, .mpeg, .mpg, .flv, .avi, .mp4, .wmv, .divx, .mkv, .mp3, .wav, .flac, .ape, .wma, .ac3
The appearance of the extension .cat in the name of a file is a sure sign that you won’t be able to open this file. And that’s why you will be presented with a ransom message dropped by the ransomware. The message is stored by a file named КАК РАСШИФРОВАТЬ ФАЙЛЫ.txt. What you could read when you open this file is the following:
Внимание! Все Ваши файлы зашифрованы!
Чтобы восстановить свои файлы и получить к ним доступ,
отправьте смс с текстом XXXX на номер YYYYУ вас есть N попыток ввода кода. При превышении этого
количества, все данные необратимо испортятся. Будьте
внимательны при вводе кода!
Apparently, the purpose of this file is to blackmail you into contacting hackers in order to receive further instructions on ransom payment by them. What we could advise you is to avoid what this message states and attempt to cope with ransomware impacts with the help of secure methods that won’t expose your system, privacy, and money at the risk of further abuses.
Remove Cat Virus and Try to Restore Data
The Xorist ransomware strain associated with .cat extension is a threat with highly complex code that plagues not only your files but your whole system. So you should properly clean and secure your infected system before you could use it regularly again. Below you could find a step-by-step removal guide that may be helpful in attempting to remove this ransomware. Choose the manual removal approach if you have previous experience with malware files. If you don’t feel comfortable with the manual steps select the automatic section from the guide. Steps there enable you to check the infected system for ransomware files and remove them with a few mouse clicks.
If you want to understand how to potentially fix encrypted files with the help of alternative data recovery approaches, make sure to read carefully all details mentioned in the step “Restore files”. We remind you that before you begin with the data recovery process, you should back up all encrypted files to an external drive as this will help you to prevent their irreversible loss.
Gergana Ivanova
Highly motivated writer with 5+ years of experience writing for ransomware, malware, adware, PUPs, and other cybersecurity-related issues. As a writer, I strive to create content that is based on thorough technical research. I find joy in the process of creating articles that are easy to understand, informative, and useful. Follow me on Twitter (@IRGergana) for the latest in the field of computer, mobile, and online security.
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Step 1: Scan for Cat Virus with SpyHunter Anti-Malware Tool
Ransomware Automatic Removal - Video Guide
Step 2: Uninstall Cat Virus and related malware 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:
Follow the instructions above and you will successfully delete most unwanted and malicious programs.
Step 3: Clean any registries, created by Cat 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 Cat Virus there. This can happen by following the steps underneath:
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: Boot Your PC In Safe Mode to isolate and remove Cat Virus
Step 5: Try to Restore Files Encrypted by Cat Virus.
Method 1: Use STOP Decrypter by Emsisoft.
Not all variants of this ransomware can be decrypted for free, but we have added the decryptor used by researchers that is often updated with the variants which become eventually decrypted. You can try and decrypt your files using the instructions below, but if they do not work, then unfortunately your variant of the ransomware virus is not decryptable.
Follow the instructions below to use the Emsisoft decrypter and decrypt your files for free. You can download the Emsisoft decryption tool linked here and then follow the steps provided below:
1 Right-click on the decrypter and click on Run as Administrator as shown below:
2. Agree with the license terms:
3. Click on "Add Folder" and then add the folders where you want files decrypted as shown underneath:
4. Click on "Decrypt" and wait for your files to be decoded.
Note: Credit for the decryptor goes to Emsisoft researchers who have made the breakthrough with this virus.
Method 2: Use data recovery software
Ransomware infections and Cat 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.
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.
Cat Virus-FAQ
What is Cat Virus Ransomware?
Cat 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 algorithms 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.
What Does Cat Virus Ransomware Do?
Ransomware in general is a malicious software that is designed to block access to your computer or files until a ransom is paid.
Ransomware viruses can also damage your system, corrupt data and delete files, resulting in the permanent loss of important files.
How Does Cat Virus Infect?
Via several ways.Cat Virus Ransomware infects computers by being sent via phishing emails, 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.
Another way you may become a victim of Cat 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 .Cat Virus files?
You can't without a decryptor. At this point, the .Cat Virus files are encrypted. You can only open them once they are decrypted using a specific decryption key for the particular algorithm.
What to Do If a Decryptor Does Not Work?
Do not panic, and backup the files. If a decryptor did not decrypt your .Cat Virus files successfully, then do not despair, because this virus is still new.
Can I Restore ".Cat Virus" Files?
Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Cat Virus files.
These methods are in no way 100% guaranteed that you will be able to get your files back. But if you have a backup, your chances of success are much greater.
How To Get Rid of Cat Virus Virus?
The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti-malware program.
It will scan for and locate Cat Virus ransomware and then remove it without causing any additional harm to your important .Cat Virus files.
Can I 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:
Germany - Offizielles Portal der deutschen Polizei
United States - IC3 Internet Crime Complaint Centre
United Kingdom - Action Fraud Police
France - Ministère de l'Intérieur
Italy - Polizia Di Stato
Spain - Policía Nacional
Netherlands - Politie
Poland - Policja
Portugal - Polícia Judiciária
Greece - Cyber Crime Unit (Hellenic Police)
India - Mumbai Police - CyberCrime Investigation Cell
Australia - Australian High Tech Crime Center
Reports may be responded to in different timeframes, depending on your local authorities.
Can You Stop Ransomware from Encrypting Your Files?
Yes, you can prevent ransomware. The best way to do this is to ensure your computer system is updated with the latest security patches, use a reputable anti-malware program and firewall, backup your important files frequently, and avoid clicking on malicious links or downloading unknown files.
Can Cat Virus Ransomware Steal Your Data?
Yes, in most cases ransomware will steal your information. It is a form of malware that steals data from a user's computer, encrypts it, and then demands a ransom in order to decrypt it.
In many cases, the malware authors or attackers will threaten to delete the data or publish it online unless the ransom is paid.
Can Ransomware Infect WiFi?
Yes, ransomware can infect WiFi networks, as malicious actors can use it to gain control of the network, steal confidential data, and lock out users. If a ransomware attack is successful, it could lead to a loss of service and/or data, and in some cases, financial losses.
Should I Pay Ransomware?
No, you should not pay ransomware extortionists. Paying them only encourages criminals and does not guarantee that the files or data will be restored. The better approach is to have a secure backup of important data and be vigilant about security in the first place.
What Happens If I Don't Pay Ransom?
If you don't pay the ransom, the hackers may still have access to your computer, data, or files and may continue to threaten to expose or delete them, or even use them to commit cybercrimes. In some cases, they may even continue to demand additional ransom payments.
Can a Ransomware Attack Be Detected?
Yes, ransomware can be detected. Anti-malware software and other advanced security tools can detect ransomware and alert the user when it is present on a machine.
It is important to stay up-to-date on the latest security measures and to keep security software updated to ensure ransomware can be detected and prevented.
Do Ransomware Criminals Get Caught?
Yes, ransomware criminals do get caught. Law enforcement agencies, such as the FBI, Interpol and others have been successful in tracking down and prosecuting ransomware criminals in the US and other countries. As ransomware threats continue to increase, so does the enforcement activity.
About the Cat Virus Research
The content we publish on SensorsTechForum.com, this Cat 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 Cat 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.
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.
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- Always check "About Us" web page.
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