THREAT REMOVAL

Remove Guster Ransomware and Restore .locked Files

This article will help you remove Guster ransomware effectively. Follow the ransomware removal instructions provided at the end of the article.

Guster is the name of a nasty ransomware that plays an audio file when it encrypts your data. Your files will become encrypted and receive the .locked extension when the encryption is done. Then, the Guster cryptovirus displays a ransom message with demands for payment. Read further to see what methods you can try to see if you can restore some of your data.

Threat Summary

NameGuster
TypeRansomware
Short DescriptionThe ransomware encrypts files on your computer and displays a ransom message afterward.
SymptomsThe ransomware will encrypt your files and put the .locked extension on all of them when the encryption process is set and done. You will then see a ransom note being put up and the following audio file will be played:
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by malware

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Malware Removal Tool

User ExperienceJoin Our Forum to Discuss Guster.
Data Recovery ToolWindows 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.

Guster Ransomware – Distribution Tactics

Guster ransomware could be distributed via different tactics. The payload file that initiates the malicious script for the ransomware, which in turn infects your computer device has been spotted on the Web. You can check out the malware analysis of the VirusTotal service for that executable file of the Guster virus, from the screenshot down below:

Guster ransomware might additionally be distributing the same payload file on social media and file-sharing sites. A lot of freeware programs might be promoted as useful on the Web, but may be hiding the malicious script for the virus. Do not immediately open files you have downloaded, which come from suspicious sources like links or emails. Instead, you should scan them first. Perform a scan with a security tool and check the size and signatures of the files for anything that seems dubious. You should read the ransomware prevention tips from the topic in the forum.

Guster Ransomware – Technical Analysis

Guster is the name of a ransomware which is also a cryptovirus. It will encrypt files on your computer machine while appending the same extension to them afterward. It might be a HiddenTear variant.

Guster ransomware could make entries in the Windows Registry to achieve persistence. Those registry entries are usually designed in a way that will start the virus automatically with each launch of the Windows Operating System.

The ransom note will appear right after the encryption process completes. It is instantly distinguishable, because of the audio message that plays. The note states what the demands of the cybercriminals are for the ransom price, along with other instructions and demands for decrypting your files. You can preview the ransom note in the screenshot right here:

That ransom message reads the following:

All of your files (documents, videos, photos, musics, pdfs, etc) have been encrypted with a strong military cryptography.
The only way you have to get your files back to you, is paying a fee of 0.4 bitcoins, which worth something about 300,00 USD.
You can buy bitcoins in various sites all over the web, like localbitcoins.com and various others. If you try to delete me or something funny,
I SWEAR I’ll blow up your whole files and you’re never going to see it again.
It’s serious!
You have 48 hours to pay me these bitcoins or you’ll never get to see yours files again! You’re warned!

Follow these steps in order to get your files back:

1 – Go to a Bitcoin exchange site and buy exactly 0.4 BTCs
1.1 – You can take a look at some of these sort of sites here: https://www.bestbitcoinexchange.io
2 – Send an email with your ID to nucklearsupport@yandex.ru
3 – Wait for a email-reply with more instructions
3.1 – It may take about 6-8 hours, if it takes more than that, send the email again. FAAAST!
3.2 – Remember! You have only 48 hours, so you better hurry up!
4 – After following all the steps (including email reply steps), you’ll get the PASSWORD to decryption.
5 – Type the password in the indicated field
6 – Click on ‘Decrypt!’
7 – It’s done. Your files will be decrypted!

Your ID: [Redacted] [Timer] Type the password here:

The virus does not actually delete any files, even if it threatens so in the ransom note.

The cyber crooks have put in that ransom note, the demanded price for decryption of your files. That price is 0,4 Bitcoins or approximately 360 US dollars. You should NOT in any circumstance pay the cybercriminals. Your files may not get recovered, and nobody can give you a guarantee for that. Also, giving money to these criminals will probably end up in supporting them and give them an even bigger incentive to create other ransomware or do more criminal acts.

As of now, there is no list of file extensions which the Guster ransomware seeks to encrypt. However, all files that get encrypted will receive the same extension appended to them, namely .locked.

The Guster cryptovirus is most likely going to delete the Shadow Volume Copies from any Windows operating system by using the following command:

→vssadmin.exe delete shadows /all /Quiet

Continue to read and find out what kind of ways you can try to restore some of your data potentially.

Remove Guster Ransomware and Restore .locked Files

If your computer got infected with the Guster ransomware virus, you should have some experience in removing malware. You should get rid of this ransomware as fast as possible before it can have the chance to spread further and infect more computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.

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Berta Bilbao

Berta is a dedicated malware researcher, dreaming for a more secure cyber space. Her fascination with IT security began a few years ago when a malware locked her out of her own computer.

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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.


OFFER

REMOVE IT NOW (PC)
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 Guster from Windows.


Step 1: Boot Your PC In Safe Mode to isolate and remove Guster

OFFER

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 Guster 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 Guster 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 Guster 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.

IMPORTANT!
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 Guster 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.

SpyHunter5-update-2018


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.

SpyHunter5-Free-Scan-2018


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.

SpyHunter-5-Free-Scan-Next-2018

If any threats have been removed, it is highly recommended to restart your PC.

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

Ransomware infections and Guster 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 Guster from Mac OS X.


Step 1: Uninstall Guster and remove related files and objects

OFFER
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 Guster:

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 Guster. 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 Guster. 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 Guster 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 Guster. 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
/Library/LaunchDaemons

Tip: ~ is there on purpose, because it leads to more LaunchAgents.


Click the button below below to download SpyHunter for Mac and scan for Guster:


Download

SpyHunter for Mac



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

Ransomware infections and Guster 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.


Guster FAQ

What is Guster ransomware and how does it work?

Guster 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 Guster ransomware infect my computer?

Via several ways.Guster 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 Guster 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 .Guster files?

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

One way to restore files, encrypted by Guster 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 ".Guster" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Guster 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 Guster 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 Guster ransomware and then remove it without causing any additional harm to your important .Guster files.

Also, keep in mind that viruses like Guster 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.

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