An article created to show you how to remove the .MASTER file virus (BTCWare’s latest variant) and restore files that have been AES encrypted by this virus.
A ransomware infection, known to be the notorious BTCWare ransomware has been released as a new variant of the virus family. Unlike the other BTCWare versions, the .master iteration cannot be decrypted so far and uses an AES encryption algorithm to extort victims whose computers have been infected. The victims have to pay a hefty ransom fee in order to get their files decrypted by the ones behind the .master ransomware infection. In case your computer has been infected by this virus, we advise you to read this article thoroughly.
Threat Summary
| Name | .master Ransomware |
| Type | Ransomware, Cryptovirus |
| Short Description | Encrypts the files on the infected computer using AES algorithm. Demands ransom payoff in BitCoin. The ransom varies. |
| Symptoms | The files are encrypted with the .master file extension added to them. The virus drops a ransom note, named !#_RESTORE_FILES_#!.inf. |
| Distribution Method | Spam Emails, Email Attachments, Executable files |
| 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 .master 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. |
Update July 2017 A new version of BTCWare ransomware has come out into the wild. The virus uses a new malicious file extension, called .aleta which i adds to the encrypted files. Malware eresearchers believe it is spread via malicious spam e-mails carrying documents that contain malicious macros within them. Furthermore, researcher Michael Gillespie notified of a decrypter being released for the .MASTER BTCWare variant. You can now decrypt your files for free if you have saved them.
.master Ransomware Distribution Methods
Since the Master ransomware as many refer to it with this name is a variant of the BTCWareransomware, it may use the same methods to be spread and infect victims. The primary strategy of those methods is to send a massive spam campaign with e-mails that aim for one thing only – to convince unsuspecting users that the situation is critical and they must either click on an e-mail attachment or open a web link that may eventually lead to infection. To do this, Master ransomware may pretend to be a large organization, such as:
- Amazon
- PayPal
- FedEx
- DHL
- eBay
- Other
The messages usually have deceptive content, also known as “social engineering”. They may claim that there is an order awaiting confirmation or any other form invoices or important documents. Then, the user may be misled to click on the malicious e-mail.
BTCWare .master Ransomware – Analysis
After the infection file of the .master ransomware variant is opened, the virus begins to drop it’s payload. This happens by either extracting the payload onto the infected computer or simply connecting to a remote server hosted by the cyber-criminals and download it from there. After this has been done, the malicious files of Master ransomware are then dropped onto the computer of the user and may reside in the following locations:
- %AppData%
- %Roaming%
- %Local%
- %LocalLow%
- %Temp%
Those files include the ransom note of .master ransomware which is named !#RESTORE_FILES_#!.inf. It has the following content:
The .master ransomware virus may begin to modify multiple different Windows processes on the compromised computer system. This is done with the purpose of changing crucial settings on the infected computer, like deleting the backups and shadow volume copies by using the following Windows Command Prompt commands:
→ process call create “cmd.exe /c
vssadmin.exe delete shadows /all /quiet
bcdedit.exe /set {default} recoveryenabled no
bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures
.master Ransomware’s Encryption Process
For the encryption process of the BTCWare .master ransomware variant to succeed, the virus uses a patched AES encryption algorithm. If applied properly, it is very difficult to decrypt the encrypted files by this virus. The files that the .master ransomware looks for to encrypt on infected computers are usually the following:
→ .1c, .3fr, .accdb, .ai, .arw, .bac, .bay, .bmp, .cdr, .cer, .cfg, .config, .cr2, .crt, .crw, .css, .csv, .db, .dbf, .dcr, .der, .dng, .doc, .docm, .docx, .dwg, .dxf, .dxg, .eps, .erf, .gif, .htm, .html, .indd, .iso, .jpe, .jpeg, .jpg, .kdc, .lnk, .mdb, .mdf, .mef, .mk, .mp3, .mp4, .mrw, .nef, .nrw, .odb, .ode, .odm, .odp, .ods, .odt, .orf, .p12, .p7b, .p7c, .pdd, .pdf, .pef, .pem, .pfx, .php, .png, .ppt, .pptm, .pptx, .psd, .pst, .ptx, .r3d, .rar, .raw, .rtf, .rw2, .rwl, .sql, .sr2, .srf, .srw, .tif, .wb2, .wma, .wpd, .wps, .x3f, .xlk, .xls, .xlsb, .xlsm, .xlsx, .zip
After the .master ransomware has already encrypted the files, the virus then displays the files with the .master file extension after their name, for example:
It is believed that the cyber-criminals behind the .master virus have chosen this file extension in particular, because all of the previous variants of BTCWare have already been decrypted using a master decryption key which malware researchers uncovered earlier. And by doing this, the cyber-criminals might aim to mock those researchers.
Remove BTCWare and Restore .master Encrypted Files
Before removing BTCWare .master variant, it is important to backup the encrypted files beforehand.
Then, you can proceed with the removal of the virus. For it to succeed, we advise following the removal instructions underneath. They are specifically designed to help you in isolating the threat and removing all related objects to .master ransomware. In case you lack the experience to remove this virus manually, cybersec experts often advise to use and advanced anti-malware program which will automatically take care of the removal process for you.
In case you are looking for a method to restore your encrypted files, we urge you to do It by trying the alternative method for file recovery below. They are specifically designed to help you recover at least some of the encrypted files. You can find them in step “2. Restore files encrypted by .master Ransomware”.
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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Step 1: Scan for .master Ransomware with SpyHunter Anti-Malware Tool
Ransomware Automatic Removal - Video Guide
Step 2: Uninstall .master Ransomware 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 .master Ransomware 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 .master Ransomware 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 .master Ransomware
Step 5: Try to Restore Files Encrypted by .master Ransomware.
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 .master 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 the top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.
.master Ransomware-FAQ
What is .master Ransomware Ransomware?
.master 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 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 .master Ransomware 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 .master Ransomware Infect?
Via several ways..master Ransomware 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 .master 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 ..master Ransomware files?
You can't without a decryptor. At this point, the ..master Ransomware 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 ..master Ransomware files successfully, then do not despair, because this virus is still new.
Can I Restore "..master Ransomware" Files?
Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore ..master Ransomware 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 .master Ransomware 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 .master Ransomware ransomware and then remove it without causing any additional harm to your important ..master Ransomware 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 .master Ransomware 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 .master Ransomware Research
The content we publish on SensorsTechForum.com, this .master Ransomware 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 .master Ransomware 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.
How to recognize trustworthy sources:
- Always check "About Us" web page.
- Profile of the content creator.
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