This article explains the issues that occur in case of infection with .GRHAN files virus and provides a complete guide on how to remove malicious files and how to potentially recover files encrypted by this ransomware.
A ransomware virus named after the extension it appends to corrupted files .GRHAN has recently been detected in the wild. In case of infection with this threat, you won’t be able to access information stored by valuable files due to significant transformations of their original code. Such a devastating impact is used by hackers who attempt to blackmail you into paying them a ransom for .GRHAN files decryption.
Threat Summary
| Name | .GRHAN Files Virus |
| Type | Ransomware, Cryptovirus |
| Short Description | A data locker ransomware that utilizes two sophisticated cipher algorithms to encode target files and extort a ransom payment from victims. |
| Symptoms | Important files are locked and renamed with .GRHAN extension. They remain unusable until their original code is recoverd. |
| Distribution Method | Spam Emails, Email Attachments, Infected Installers |
| Detection Tool |
See If Your System Has Been Affected by malware
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Malware Removal Tool
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User Experience | Join Our Forum to Discuss .GRHAN Files Virus. |
| 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. |
.GRHAN Files Virus – Distribution
The payload file of the so-called .GRHAN files virus has probably managed to access your computer by being a part of a spam email. Emails that attempt to deliver malicious code on users’ devices are often designed as representatives of well-known businesses, websites, and even governmental institutions. This trick aims to mislead you and make you more prone to start the malicious code on your PC without noticing its presence.
As regards the malicious code that triggers ransomware infection it is usually disguised as file attachment of common type such as document, image, archive, PDF or as a URL address to an infected web page. Text messages presented by emails part of malspam campaigns usually attempt to provoke a sense of urgency and this way lure you into opening affected elements on your device as soon as possible.
In order to stay safe in future we recommend you to check our forum for several safety tips. They could help you prevent ransomware infections like .GRHAN from infecting your system.
.GRHAN Files Virus – Overview
A strain of [wplinkpreview url=”https://sensorstechforum.com/remove-matrix-ransomware-restore-files/”]Matrix ransomware has been spotted in the wild. It is associated with the extension .GRHAN and that’s why the threat is called .GRHAN crypto virus. Like its predecessors, .tro virus is designed to interfere with main system settings which in turn enable it to encrypt target files.
An infection with .GRHAN ransomware virus could be triggered by a payload file. Such a file usually contains a variety of commands that support the infection process. At first, it is likely to initiate the creation of additional malicious files on the system. Once the ransomware establishes these files it starts executing them in a predefined order. This process leads to the completion of all infection stages.
Before .GRHAN could reach the main stage of its infection – data corruption, it needs to access some system components in order to apply changes that will enable it to evade detection and obtain a persistent presence. Usually, the Registry Editor is among the affected components.
This could be explained by the fact that its powerful functionalities control large number of processes related to the performance of installed apps and the operating system itself. Where you should check for malicious entries is definitely under the Run and RunOnce registry keys:
- 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
Since these keys have the functionality to cause programs to run each time that a user logs on, they are often targeted by ransomware viruses like .GRHAN
Soon after the ransomware completes all infection stages, it drops the text file !README_GRHAN!.rtf and loads it on the screen. The purpose of this message is to blackmail you into transferring hackers an unspecified amount of money converted in Bitcoin as a ransom fee for corrupted files.
Beware, that even a successful ransom payment does not guarantee the recovery of your encrypted files.
.GRHAN Files Virus – Encryption Process
After the ransomware manages to plague all needed system components it activates an in-built encryption module to complete the main infection stage. During this stage, .GRHAN files virus applies changes to the original code of target files with the help of two sophisticated cipher algorithms – RSA 2048 bit and AES 128 bit.
As a result, corrupted files receive the extension .GRHAN and remain inaccessible until their code is recovered to its original state.
Like previous variants of Matrix ransomware variant, .GRHAN is likely to corrupt types of files that store valuable data such as:
- Audio files
- Video files
- Document files
- Image files
- Backup files
- Banking credentials, etc
Remove .GRHAN Files Virus and Restore Data
The ransomware associated with .GRHAN 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 regularly use it 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.
In order to keep your system safe from ransomware and other types of malware in future, you should consider the installation of a reliable anti-malware program. As an additional security layer that could prevent the occurrence of ransomware attacks you could install an [wplinkpreview url=”https://sensorstechforum.com/the-most-popular-free-anti-ransomware-tools/”]anti-ransomware tool.
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 .GRHAN Files Virus with SpyHunter Anti-Malware Tool
Ransomware Automatic Removal - Video Guide
Step 2: Uninstall .GRHAN Files 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 .GRHAN 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 .GRHAN Files 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 .GRHAN Files Virus
Step 5: Try to Restore Files Encrypted by .GRHAN Files 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 .GRHAN 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.
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.
.GRHAN Files Virus-FAQ
What is .GRHAN Files Virus Ransomware?
.GRHAN 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 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 .GRHAN Files 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 .GRHAN Files Virus Infect?
Via several ways..GRHAN Files 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 .GRHAN 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 ..GRHAN Files Virus files?
You can't without a decryptor. At this point, the ..GRHAN Files 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 ..GRHAN Files Virus files successfully, then do not despair, because this virus is still new.
Can I Restore "..GRHAN Files Virus" Files?
Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore ..GRHAN Files 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 .GRHAN Files 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 .GRHAN Files Virus ransomware and then remove it without causing any additional harm to your important ..GRHAN Files 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 .GRHAN Files 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 .GRHAN Files Virus Research
The content we publish on SensorsTechForum.com, this .GRHAN Files 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 .GRHAN Files 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.
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