Euclid Ransomware

Also Known As: Euclid virus
Distribution: Low
Damage level: Medium

Euclid ransomware removal instructions

What is Euclid?

Discovered by Michael Gillespie, Euclid is high-risk ransomware designed to encrypt most stored files, thereby rendering them unusable. During encryption, Euclid appends filenames with the ".euclid" extension. For instance, "sample.jpg" is renamed to "sample.jpg.euclid". Euclid also delivers a ransom-demand message via the "recovery.txt" text file, which is stored in every existing folder.

The delivered message states that data is encrypted using RSA-2048 and Salsa20 algorithms. Thus, a number of decryption keys are generated for each victim. Restoring data without these keys is impossible, however, victims cannot access their keys, since all are stored on a remote server controlled by cyber criminals (Euclid's developers). To obtain their keys and restore data, each victim must pay a ransom. The cost is not specified - all information is provided via telegram, however, criminals usually demand $500-$1500 in Bitcoins, Monero, Ethereum or another cryptocurrency. Regardless of the cost, do not pay. Research shows that cyber criminals usually ignore victims once payments are submitted. Therefore, paying usually gives no positive result and users are scammed. Unfortunately, there are no tools capable of cracking Euclid encryption and restoring data free of charge. The only solution is to restore everything from a backup.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Euclid decrypt instructions

There are hundreds of ransomware-type infections that share many similarities (e.g., Poret, Buran, and Stone). Most encrypt data so that developers can make ransom demands. Unfortunately, the encryptions are typically performed using algorithms that generate unique decryption keys, and thus manual decryption without developers involvement is impossible. The only possible scenario is the ransomware not being fully developed or having certain bugs/flaws. Ransomware-type infections present a good case for maintaining regular backups, however, store them on remote servers or unplugged storage devices, since locally stored backups are compromised together with regular data. Additionally, have multiple backup copies stored in different locations, since there is always the chance that servers/storage devices might be damaged.

How did ransomware infect my computer?

Ransomware infections are often proliferated using third party software download sources, spam email campaigns, trojans, and fake software updaters, and 'cracks'. Unofficial download sources (peer-to-peer [P2P] networks, free file hosting websites, freeware download sites, etc.) present malicious executables as legitimate software, thereby tricking users into manual download/installation of malware. Criminals use spam campaigns in a similar manner. They send hundreds of thousands of emails consisting of malicious attachments (links/files) and deceptive messages encouraging users to open them. Malicious attachments are usually presented as important documents (e.g., receipts, invoices, bills, or similar) in attempts to give the impression of legitimacy and increase the chance of tricking recipients into opening the files. Trojans are malicious applications that stealthily infiltrate computers to injecting additional malware. Fake software updaters infect computers by exploiting outdated software bugs/flaws or simply downloading and installing malware rather than updates. The same applies to fake cracks. These tools infect computers rather than providing access to paid features. In summary, the main reasons for computer infections are poor knowledge of these threats and careless behavior.

Threat Summary:
Name Euclid virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .euclid
Ransom Demanding Message recovery.txt text file
Cyber Criminal Contact @SalsaRecovery (telegram)
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.

To eliminate Euclid virus our malware researchers recommend scanning your computer with Spyhunter.
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Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

The key to computer safety is caution. Therefore, pay close attention during the download/installation/update processes and when browsing the Internet. Carefully analyze each email and any attachments received. Files/links sent by suspicious/unrecognizable email addresses should never be opened. The same applies to attachments that are irrelevant and do not concern you. Software should be downloaded from official sources only, using direct download links. Third party downloaders/installers often include rogue apps, and thus such tools should never be used. Keeping installed applications up-to-date is also extremely important, however, this should be achieved only through implemented functions or tools provided by the official developer. Bear in mind that software piracy is a cyber crime and the risk of infection is extremely high. Have a reputable anti-virus/anti-spyware suite installed and running at all times. These tools detect and eliminate malware before the system is harmed. If your computer is already infected with Euclid, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Euclid ransomware text file ("recovery.txt"):

[+] What's happned ? [+]
all your files have been encrypted(locked) by us
but no worries you can easilly recover(decrypt) your files
just message us and we'll help you out

[+] what should i do [+]
keep calm and message us

[+] do you garantee recovery of my files ?[+]
yeah 100% , it our job all your files are recoverable 100% sure
no matter how big they are or what format(type) they were

[+] well then how should i contact you [+]
we use popular full secure telegram messenger for communicating,
it's free and 100% secure, download it and sign up using any phone number (your phone number is kept by telegram and hidden for us or anyone else )
then copy paste the folling link in the messenger and click or enter our id in the search bar
then click "Send messages"
link :: hxxps://
ID: @SalsaRecovery

[+] how do you ensure me you can recover my files[+]
well we can give you free decryption of a file for ensuring
pick a random file (no matter what size and type) send it us and will give you back the decrypted(original) file
please note that if the file contanains valuable info we'll ask for another file

[+] i want technical details of the encryption [+]
we use 2*RSA2048 + salsa20/20 algorithm for encrytion
and new random salsa key is genrated for each file
rsa is a method of encrypting that has different keys for decrytion and encryption (public key and private key) ,
so it's impossible to recover your files without our private key
Mathematics science proves that
your decryion keys are stored in : decryption_keys.euclidkeys file ,we need it for decryption(only we can read it)
don't worry we're here to help you

[+] can i message you if i don't want to pay any thing [+]
Sure we'll be happy to hear any thing from you
we'll guide you to protect your data after this
and secure your system for free

BEST WISHES Euclid team

Screenshot of files encrypted by Euclid (".euclid" extension):

Files encrypted by Euclid

Euclid ransomware removal:

Instant automatic removal of Euclid virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of Euclid virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the Euclid virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Euclid ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Euclid ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Euclid are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by Euclid, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Euclid ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in Documents, Pictures, Videos, Music, Favorites as well as Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove Euclid ransomware:

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global virus and spyware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Euclid virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Euclid virus on your mobile device.
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Platform: Windows

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