THREAT REMOVAL

ThunderCrypt – Remove and Restore Encrypted Files

This article is created to help you remove ThunderCrypt ransomware infection from your computer and restore AES and RSA encrypted files.

A ransomware infection known as ThunderCrypt has been reported to use a strong combination of AES and RSA ciphers to encrypt the files on the computers infected by this ransomware infection. The virus then leaves behind a ransom note, where it demands from victims to pay approximately 0.3 BTC in order for their files to be decrypted and restored back to normal. In case you have become a victim of ThunderCrypt ransomware, recommendations are to focus on removing the virus and restoring your data. It is strongly advisable to read this article in case you have become a victim of ThunderCrypt ransomware.

Threat Summary

Name

ThunderCrypt

TypeRansomware
Short DescriptionEncrypts files on the computers it infects asking a hefty ransom fee to be paid – 0.345 BTC.

SymptomsThe victim may not be able to open the files. Displaying of error messages. Dipslaying of the virus wallpaper and ransom note.
Distribution MethodVia an Exploit kit, Dll file attack, malicious JavaScript or a drive-by download of the malware itself in an obfuscated manner.
Detection Tool See If Your System Has Been Affected by malware

Download

Malware Removal Tool

User ExperienceJoin our forum to Discuss ThunderCrypt.
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.

ThunderCrypt Ransomware – Distribution

For the infection process of ThunderCrypt ransomware, different types of malicious tools may be used:

  • Exploit kit software.
  • JavaScript (.js) files.
  • Microsoft Office or Adobe PDF documents with malicious macros.
  • Intermediary malware such as downloaders and droppers.
  • Multiple other malicious files.

The files for which this ransomware is responsible in connection to it’s distribution may usually be spread via different types of methods, such as:

  • Via malicious spam e-mails sent to victims as form of legitimate documents or web links.
  • Via seemingly legitimate files sent out to users in order to trick them into downloading them from online file sharing services, like Dropbox.
  • Via fake updates, pretending to fix Java or Adobe Flash.
  • Via fraudulent license activators, keygens and other types of files as well.

An example of an attachment sent via e-mail can be seen below, asking the victim to enable macros:

ThunderCrypt Ransomware – Activity

After the victim has been already infected, the intermediary malware of ThunderCrypt connects to a remote host and may download multiple malicious files on the compromised computer. On of those files is detected to be eyny.exe and besides it, other support modules may also be downloaded:

.dll, .bat, .vbs, .tmp, .reg, .exe, .js

These files may reside in the following Windows system folders:

%AppData%
%Local%
%Roaming%
%Windows%

The malicious files, also called modules are responsible for the malicious activity of ThunderCrypt ransomware, including the encryption of the files of the victim PC. For starters, the ThunderCrypt virus may attack multiple different registry entries in order to make it’s malicious file that encrypts data run on Windows start-up. The targeted Windows keys for this purpose are the following:

HKEY_LOCAL_MACHINE:
Software\Microsoft\Windows\CurrentVersion\Run
Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_CURRENT_USER:
Software\Microsoft\Windows\CurrentVersion\Run
Software\Microsoft\Windows\CurrentVersion\RunOnce

In addition to performing modifications in the Windows Registry Editor, this ransomware infection may also delete the Shadow Volume copies (back ups) of the compromised computer. This happens by running a process in the background that opens cmd.exe and types the following commands in the background:

→ process call create “cmd.exe /c
vssadmin.exe delete shadows /all /quiet
bcdedit.exe /set {default} recoveryenabled no
bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures

After this has been performed, the virus may drop it’s distinctive ransom note, named ThunderCrypt. It has a screen with a timer that has the following message to affected users:

Good afternoon!
We have encrypted all your personal files!
To see the list of encrypted files click here.
We did this using hybrid RSA-2048 public key encryption. It basically means there is no way to decrypt your files without the private key. The private key is stored on our server.
Indeed, we can recover your files. You just have to pay us before the deadline (see the countdown). If you don’t the private key will be securely erased from our server and you will lose encrypted files forever.
Transfer required amount (see on the left) to the Bitcoin address below, which was generated just for your payment. If you don’t know how to use Bitcoin or where to buy Bitcoins, click here. As soon as the transaction gets confirmed, the decryption will start automatically. It usually takes about 30 minutes for a transaction to become confirmed. You will be notified about any progress.
{BITCOIN ADDRESS HERE}
WARNING. Antivirus software may remove this program, but it can’t decrypt your files. So, better temporarily disable your antivirus, because we can’t decrypt your files if this program is damaged. Also, do not modify any of the encrypted files, otherwise even we won’t be able to recover them.
If you have any questions or if you encounter any problems with payment, feel free to contact us.
Also we can decrypt one file up to 3 MiB for free as a proof that decryption is possible.

.ThunderCrypt – Encryption Process

In order to encrypt files, ThunderCrypt ransomware uses a strong combination of AES and RSA ciphers. The AES cipher aims to encrypt the files themselves and generate a unique key and the RSA cipher is there to generate public and private key for each file or set of files. The information is then sent to the cyber-criminals and has a unique ID in it by which they can distinguish different infections. The targeted files for encryption may be the following:

→ “PNG .PSD .PSPIMAGE .TGA .THM .TIF .TIFF .YUV .AI .EPS .PS .SVG .INDD .PCT .PDF .XLR .XLS .XLSX .ACCDB .DB .DBF .MDB .PDB .SQL .APK .APP .BAT .CGI .COM .EXE .GADGET .JAR .PIF .WSF .DEM .GAM .NES .ROM .SAV CAD Files .DWG .DXF GIS Files .GPX .KML .KMZ .ASP .ASPX .CER .CFM .CSR .CSS .HTM .HTML .JS .JSP .PHP .RSS .XHTML. DOC .DOCX .LOG .MSG .ODT .PAGES .RTF .TEX .TXT .WPD .WPS .CSV .DAT .GED .KEY .KEYCHAIN .PPS .PPT .PPTX ..INI .PRF Encoded Files .HQX .MIM .UUE .7Z .CBR .DEB .GZ .PKG .RAR .RPM .SITX .TAR.GZ .ZIP .ZIPX .BIN .CUE .DMG .ISO .MDF .TOAST .VCD SDF .TAR .TAX2014 .TAX2015 .VCF .XML Audio Files .AIF .IFF .M3U .M4A .MID .MP3 .MPA .WAV .WMA Video Files .3G2 .3GP .ASF .AVI .FLV .M4V .MOV .MP4 .MPG .RM .SRT .SWF .VOB .WMV 3D .3DM .3DS .MAX .OBJ R.BMP .DDS .GIF .JPG ..CRX .PLUGIN .FNT .FON .OTF .TTF .CAB .CPL .CUR .DESKTHEMEPACK .DLL .DMP .DRV .ICNS .ICO .LNK .SYS .CFG”Source:fileinfo.com

The ThunderCrypt virus is very careful not to encrypt important Windows files, so that the operating system works and has active connection. It may skip encrypting the files in the important Windows system folders.

Remove ThunderCrypt Ransomware and Restore Data

Before actually performing the removal of the ThunderCrypt infection, recommendations are to always backup the encrypted files. After doing so, it is strongly advisable to follow the instructions below. They will help you remove ThunderCrypt either manually or automatically. Security experts always outline the automatic approach as the best solution. It includes scanning the computer with a tool specifically designed to remove malware, such as ThunderCrypt thoroughly and swiftly.

After having removed ThunderCrypt ransomware, you may want to try the alternative tools for file restoration in step “2. Restore files encrypted by ThunderCrypt” below. They are not 100% effective, but in some scenarios may restore a huge chunk of your data.

Avatar

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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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 ThunderCrypt from Windows.


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

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 ThunderCrypt 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 ThunderCrypt 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 ThunderCrypt 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 ThunderCrypt 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 ThunderCrypt.

Ransomware infections and ThunderCrypt 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 ThunderCrypt from Mac OS X.


Step 1: Uninstall ThunderCrypt 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 ThunderCrypt:

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 ThunderCrypt. 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 ThunderCrypt. 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 ThunderCrypt 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 ThunderCrypt. 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 ThunderCrypt:


Download

SpyHunter for Mac



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

Ransomware infections and ThunderCrypt 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.


ThunderCrypt FAQ

What is ThunderCrypt ransomware and how does it work?

ThunderCrypt 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 ThunderCrypt ransomware infect my computer?

Via several ways.ThunderCrypt 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 ThunderCrypt 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 .ThunderCrypt files?

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

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

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

Also, keep in mind that viruses like ThunderCrypt 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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