Kryptonite ransomware virus: what it is and how to remove it
Kryptonite is a crypto-malware that has been spreading as a fake Snake game. Due to this unique distribution name, the virus is known under Kryptonite Snake name.
Facts checked October 7, 2026. Removal steps tested on Windows 11 (26H2) and checked against Microsoft's and the browser makers' current documentation. Sections marked as our earlier report are the original text: they describe the threat as it was then and have not been reviewed since. The 2026 status, the removal steps and the questions are current.
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Kryptonite ransomware virus: summary
| Detection names | No Microsoft detection name is known |
|---|---|
| Ransom note | A message left on the computer; the text is quoted in full below |
| Contact | Not recorded in our earlier report |
| Encrypted file extension | Not recorded in our earlier report |
| Decryptor | No free decryptor is known for this variant; check No More Ransom (nomoreransom.org) for updates |
| Distribution | Not recorded in the old report |
| Removal | Scan the PC with security software to find and remove the malware and anything installed with it. Fortect scans Windows for malware and repairs the system files and settings it damaged. Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free. |
Show 8 more facts
| Damage | Not recorded in the old report |
|---|---|
| Name | Kryptonite ransomware virus |
| Type | File-encrypting ransomware |
| Symptoms | An unknown program in Installed apps and a ransom note left in folders |
| Evidence | 6 write-ups by security sites; no sample analysed yet |
| Free decryptor | No free decryptor is known (checked 7 October 2026) |
| First seen | 21 September 2017 |
| Facts checked | 7 October 2026 |
Names and addresses to look for
- Note file:
the ransom note
How Kryptonite ransomware virus behaves
From our report of Sep 2017 · not reviewed since
Kryptonite continues its malicious tasks under the name of RBY
Kryptonite is a crypto-malware that has been spreading as a fake Snake game.
Due to this unique distribution name, the virus is known under Kryptonite Snake name. However, malware has been updated on September 2017, and currently, it spreads as RBY ransomware.
The recent version works similarly as the previous one. It spreads as an obfuscated Kryptonite.exe file. However, Kryptonite RBY sets a new wallpaper on the affected computer. The picture includes a short message in Russian and English languages:
When the original version of the Kryptonite ransomware virus has been discovered, it was functioning as crypto-malware which seemed to be under development. However, the most distinguishable feature is that the malware disguises under the Snake game.
Upon launching snake_game.exe, you see the names of the supposed authors: Manish Kumar and Gaurav Anand. Thanks to the IT specialist, Leo, who has found the sample, the virus links to the institute of technology located in Israel.
At the moment, the ransomware does not append any file extension, but it still encodes data with RSA-2048 . Here is a summary of its features:
Though the ransomware still manages to encode your files, Kryptonite removal might be a better option. or helps you do that faster.
- Urges to launch getmyId.exe
- Launches voice message after encryption
- Leaves no file extension
- Uses RSA-2048 encryption technique

From our report of Sep 2017 · not reviewed since
The operation of ransomware has imperfections
Perhaps the authors wanted to test their programming skills rather than create a full-fledged malware.
The operation mode is not polished as it occasionally crashes or gets stuck at a non-responding state.
Additionally, the malware asks to launch getmyID.exe file. However, such file is nowhere to be found. Interestingly, the authors took one feature from Cerber virus. After the virus gets finally executed and finishes encoding message, an abrupted male voice informs that all documents and photos are encrypted.
The authors did not bother themselves with elaborating the malware as it does not leave any file extension, though the content of the files is encrypted with an elaborate algorithm.
However, the most unusual feature of Kryptonite malware is the payment stage. Unlike other malware which asks to transfer files the files to a Bitcoin address, this malware asks to pay 500 dollars, but instead of sending the money, it demands to enter credit card information.
Needless to say that you should not remit the payment since the malware does is not fully developed. Furthermore, once the perpetrators get hold of your personal data, you might suffer much bigger financial losses. Thus, remove Kryptonite malware right away.

From our report of Sep 2017 · not reviewed since
Possible ways to get infected with Kryptonite
As mentioned before, the original version of ransomware infiltrates into PCs under the snake game or, more specifically, snake_game.exe.
Users may also notice cad.exe file in their Task Manager. In order to stop the trojan which might be identified as Win32.Trojan-Ransom.Filecoder.P@gen, Ransom_KRYPTONITE.A, make sure you enforce proper security of the device. Thus, you should install an anti-spyware application to avoid this crypto-virus.
However, software utilities are not sufficient in lowering infection rate. Note that gaming websites often happen to be a haven for ransomware. Thus, before downloading a game, make sure it is the legitimate version.
Meanwhile, the RBY ransomware virus spreads as a Kryptonite.exe. The specific distribution methods are currently unknown. Thus, it seems that developers may have looked broader to the possible dissemination strategies and might spread the virus using:
Therefore, you should follow cyber security tips to avoid ransomware. Avoid clicking or opening unknown links or email attachments. Staying away from unknown file-sharing sites and downloading only legit programs might help to minimize the risk of the attack too.
- malicious spam email campaigns;
- unprotected RDP configuration;
- fake or illegal software downloads or updates;
- exploit kits;
- malware-laden ads.
The Kryptonite ransomware virus ransom note
ВНИМАНИЕ!
В этой фотографии скрывается флаг.
ATTENTION!
All the files on your disk were encrypted.
How to remove Kryptonite ransomware virus
Tools you'll need
All of these are free except where noted. Download them on a clean device if the infected PC is offline.
- A USB stick: to keep the ransom note, two or three encrypted files and screenshots off the infected PC.
- Microsoft Defender Offline: built into Windows 11 and Windows 10; scans before Windows starts, so running malware cannot hide.
- Microsoft Safety Scanner: a second, portable scanner with current signatures; each download works for 10 days.
- ID Ransomware: identifies the family from the note and one encrypted file and says whether a decryptor exists.
- No More Ransom: the free decryptors from police and security companies; check it again every few months.
- Fortect (optional): scans Windows for malware and repairs the system files and settings it damaged. The free scan is in the box above.
How to remove Kryptonite ransomware virus and get your files back
Work in this order.
Disconnecting comes first, removal comes before any restore, and nothing here asks you to contact the attackers.
Step 1: Disconnect the PC and unplug backup drives
Kryptonite ransomware virus encrypts everything it can reach, including drives and shares you connect later. Cut the network first: cable out, or Wi-Fi off from the taskbar.
Then unplug every USB stick and backup disk and pause cloud sync, so the encrypted versions do not replace your online copies. Do not reconnect any of them until the ransomware is removed from the Windows 11 or Windows 10 PC.

Windows 11: turn off Wi-Fi to take the PC offline. Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 2: Save the ransom note and identify the family
Find the ransom note, usually a
.txt,.htmlor .hta file in every folder or on the desktop, and copy it with one or two encrypted files to a USB stick.From another device, upload them to ID Ransomware or No More Ransom's Crypto Sheriff, which name the family from the note and the file extension. Write down the contact address and your personal ID from the note for the report.
Warning: Never contact the attackers from the infected Windows 11 or Windows 10 PC.

Windows 11: the ransom note and encrypted files to copy for identification. Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 3: Check for a free decryptor
For Kryptonite ransomware virus, no free decryptor is known (checked 7 October 2026). Search the family name in the No More Ransom decryption tools list and in the free decryptors of Emsisoft, Avast and Kaspersky, because new tools appear years after an attack.
Important: Keep the encrypted files even if nothing works today, and do not pay before every free option is ruled out: payment does not guarantee a working key.
Decryptors run on Windows 11 and Windows 10, but only after the ransomware itself is removed.
Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 4: Remove the ransomware before you restore or decrypt
Restoring or decrypting files while Kryptonite ransomware virus still runs lets it encrypt them again. Run a Full scan in Windows Security > Virus & threat protection > Scan options, then the Microsoft Defender Antivirus (offline scan).
If the ransomware blocks Windows Security, start Safe Mode with Networking and scan from there. Some families install a password stealer as well, so let both scans finish on Windows 11 or Windows 10.

Windows 11: Windows Security > Virus & threat protection > Scan options. Full procedure with screenshots: Run a Microsoft Defender Offline scan
Step 5: Look for shadow copies of the files
Open Command Prompt as administrator and run
vssadmin list shadows. If it lists copies dated before the attack, right-click a folder with encrypted files in File Explorer, choose Properties > Previous Versions, and open or restore a version from before that date.ShadowExplorer, a free tool, shows the same copies when the tab is empty or hidden. Most current families delete shadow copies, so an empty list is normal, but the check takes two minutes on Windows 11 or Windows 10.

Windows 11: vssadmin list shadows shows whether shadow copies exist. Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 6: Restore the files from a backup or recover deleted originals
Restore from an external backup, File History or OneDrive's version history, choosing a date before the attack. Connect the backup drive only after the scans are clean, or the ransomware encrypts it too.
If there is no backup, file recovery software can sometimes find the deleted originals, because some ransomware writes an encrypted copy and deletes the original file.
Stop writing to the drive and try recovery on Windows 11 or Windows 10 before new files overwrite the space.
Full procedure with screenshots: Recover deleted files (Recycle Bin, backups, OneDrive) On uGetFix
Instructions for each browser and system
The detailed steps for every browser and system this guide covers. Open the one you use.
Manual removal using Safe Mode
Important! →
Manual removal guide might be too complicated for regular computer users. It requires advanced IT knowledge to be performed correctly (if vital system files are removed or damaged, it might result in full Windows compromise), and it also might take hours to complete. Therefore, we highly advise using the automatic method provided above instead.
Step 1. Access Safe Mode with Networking
Manual malware removal should be best performed in the Safe Mode environment.
Windows 7 / Vista / XP
- Click Start > Shutdown > Restart > OK.
- When your computer becomes active, start pressing F8 button (if that does not work, try F2, F12, Del, etc. - it all depends on your motherboard model) multiple times until you see the Advanced Boot Options window.
- Select Safe Mode with Networking from the list.

Windows 10 / Windows 8
- Right-click on Start button and select Settings.

- Scroll down to pick Update & Security.

- On the left side of the window, pick Recovery.
- Now scroll down to find Advanced Startup section.
- Click Restart now.

- Select Troubleshoot.
- Go to Advanced options.

- Select Startup Settings.

- Press Restart.
- Now press 5 or click 5) Enable Safe Mode with Networking.

Step 2. Shut down suspicious processes
Windows Task Manager is a useful tool that shows all the processes running in the background. If malware is running a process, you need to shut it down:
- Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
- Click on More details.

- Scroll down to Background processes section, and look for anything suspicious.
- Right-click and select Open file location.

- Go back to the process, right-click and pick End Task.

- Delete the contents of the malicious folder.
Step 3. Check program Startup
- Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
- Go to Startup tab.
- Right-click on the suspicious program and pick Disable.

Step 4. Delete virus files
Malware-related files can be found in various places within your computer. Here are instructions that could help you find them:
- Type in Disk Cleanup in Windows search and press Enter.

- Select the drive you want to clean (C: is your main drive by default and is likely to be the one that has malicious files in).
- Scroll through the Files to delete list and select the following:
Temporary Internet Files
Downloads
Recycle Bin
Temporary files - Pick Clean up system files.

- You can also look for other malicious files hidden in the following folders (type these entries in Windows Search and press Enter):
%AppData%
%LocalAppData%
%ProgramData%
%WinDir%
After you are finished, reboot the PC in normal mode.
From our report of Sep 2017 · not reviewed since
Guidelines for Kryptonite ransomware elimination
Fortunately, this malware is not fully developed so you should not encounter Kryptonite removal difficulties.
However, you should still rely on malware removal tools, such as , or . In case, the malware prevents you from deleting it, you might benefit from below instructions.
It is not recommended to remove Kryptonite virus manually as its affiliated files might remain on the system. On the final note, some users are likely to be more targeted.
[GI=method-2]Opt for System Recovery in case you cannot launch an anti-malware utility during Safe Mode.
Even though the malware uses a sophisticated encryption mode, it is likely that you may restore files using this software. It is especially beneficial when restoring lost or damaged files.
The benefits of ShadowExplorer
The virus is unlikely to delete shadow volume copies, so you might stand a chance.
At the moment, the officilal decryption is not released yet.
Report it and recover your files
Report it
Report the attack even if you do not expect the files back: insurers and banks ask for the report number, and police use the contacts in the note to link cases.
- United States
- FBI IC3 · FTC ReportFraud
- United Kingdom
- Report Fraud (formerly Action Fraud) · NCSC
- Australia
- ReportCyber (ASD)
- EU countries
- Europol: national reporting sites
Give the victim ID, the note and the date the files were encrypted. A business that holds personal data may also have to notify its data protection authority, in the EU within 72 hours.
Make the next attack harmless
Kryptonite ransomware virus could only hurt the files that had no second copy, and the signs (kryptonite ransomware virus in the list of installed apps) showed exactly which ones those were. The 3-2-1 rule fixes that:
- three copies
- two media
- one disconnected
A practical version for a home PC: OneDrive or another cloud backup with version history, plus an external disk that you plug in once a week for File History and then unplug. Test a restore now and then by opening a few files from the backup on another device.
Details, schedules and what not to back up are in our 3-2-1 backup guide for Windows.
Choose a proper web browser and improve your safety with a VPN tool
Online spying has got momentum in recent years and people are getting more and more interested in how to protect their privacy online.
One of the basic means to add a layer of security - choose the most private and secure web browser. Although web browsers can't grant full privacy protection and security, some of them are much better at sandboxing, HTTPS upgrading, active content blocking, tracking blocking, phishing protection, and similar privacy-oriented features.
However, if you want true anonymity, we suggest you employ a powerful VPN - it can encrypt all the traffic that comes and goes out of your computer, preventing tracking completely.
Lost your files? Use data recovery software
While some files located on any computer are replaceable or useless, others can be extremely valuable.
Family photos, work documents, school projects - these are types of files that we don't want to lose. Unfortunately, there are many ways how unexpected data loss can occur:
- power cuts
- Blue Screen of Death errors
- hardware failures
- crypto-malware attack
- even accidental deletion
To ensure that all the files remain intact, you should prepare regular data backups. You can choose cloud-based or physical copies you could restore from later in case of a disaster. If your backups were lost as well or you never bothered to prepare any, can be your only hope to retrieve your invaluable files.
Questions about Kryptonite ransomware virus
Should I pay the ransom in the ransom note?
Not before you have tried everything else. Identify the family from the ransom note and one encrypted file, check No More Ransom for a free decryptor, and look for clean copies in OneDrive, backups and Previous Versions.
Paying funds further attacks, may be illegal if the group is sanctioned, and is no promise of a working key: many victims get partial or broken decryption. If you consider paying for business-critical data, involve the police and a professional incident responder first, and never pay through intermediaries who promise their own decryption.
When will a decryptor for Kryptonite ransomware virus be released?
Nobody can promise a date. When we last checked, on 7 October 2026, no free decryptor is known. Decryptors usually appear after one of three events:
- police seize the attackers' servers and keys
- the authors leak or publish the master keys
- researchers find a mistake in how the ransomware generates keys
Some families got a tool within weeks, others never. Keep the encrypted files and the note on an external drive, check No More Ransom every few months, and follow news about the Kryptonite ransomware virus family. A decryptor may need an original file, so keep any unencrypted copies too.
How did Kryptonite ransomware virus get on my computer?
The way Kryptonite ransomware virus spreads has not been documented yet, so look at your own recent activity. On home PCs, ransomware most often comes with cracked programs, game cheats, key generators and fake updates, or with an e-mail attachment that was opened. On business networks, attackers usually log in through Remote Desktop with a stolen or guessed password.
Think back to what was downloaded or installed in the days before kryptonite ransomware virus in the list of installed apps, and check the Downloads folder and Installed apps sorted by date. Keep anything suspicious for your report, but do not run it again.
Can a data-recovery company decrypt my files for a fee?
Only if a decryptor already exists or the company pays the attackers for you. Some "ransomware recovery" services advertise that they can decrypt families with no known flaw; in practice they negotiate with the attackers and add their own fee. Others use the same free tools listed on No More Ransom.
Before you hire anyone, ask in writing how they will recover the files, whether they will contact the attackers and what happens if they fail. A legitimate service answers clearly. If a free decryptor exists for your family, you can run it yourself.
Did Kryptonite ransomware virus steal my files or passwords?
We do not know yet. Nothing published so far shows data theft by Kryptonite ransomware virus, but the only confirmed sign is kryptonite ransomware virus in the list of installed apps, which says nothing about what happened before. Many current ransomware attacks copy files or run a password stealer first, so it is wise to act as if they did.
From a clean device, change the passwords that were saved in the browsers on this PC, starting with e-mail and banking, sign out of all sessions and turn on two-step verification. Watch bank statements and account activity for the next few weeks.
Is Kryptonite ransomware virus the same as other ransomware with a similar name?
Not necessarily. Ransomware names come from the file extension, the note or a word in the code, so unrelated families often end up with similar names, and one family can appear under several names. The difference matters: a decryptor or advice for one family does not fit another and can damage files.
Compare the ending added to your files and the exact name of the note with the summary table at the top of this guide, then upload the note and one encrypted file to ID Ransomware from a clean device. If the result names another family, follow the guide for that family instead.
Can I delete the ransom note?
Yes, the note itself is harmless text and deleting it does not affect your files. Keep at least one copy first, outside the infected PC. the ransom note contains your personal ID and the attackers' contact details, which identification services use to tell which family encrypted your files, and which a decryptor may need later.
Police reports also ask for it. Once you have saved a copy, you can remove the notes from every folder after the ransomware program has been removed and your files are restored or backed up.
How do I open my .docx, .jpg and other files locked by Kryptonite?
You cannot open locked files normally while they stay encrypted, and renaming them will not help. Our earlier report did not record the extension that Kryptonite adds, so check one locked file name and the ransom note for it.
No free decryptor is known for this variant; check No More Ransom (nomoreransom.org) for updates. Do not rename the files, change the extension or edit them, because that can make recovery harder. Copy the locked files to an external drive before you clean the system, so a decryptor released later still has them.
Will Fortect remove Kryptonite ransomware virus?
Fortect scans Windows for malware and unwanted programs and repairs the system files and settings they change, and its free scan shows what it finds on your PC before you decide anything.
For Kryptonite ransomware virus, follow the plan above as well: the browser steps take back permissions and settings that no scanner treats as a threat, and uninstalling the program that brought it removes the source.
Run Microsoft Defender's full scan and, if anything was found, its offline scan as a second opinion. If the symptoms are gone after the plan and both scans are clean, there is nothing more to do.
Sources
- Youtube: Ransomware Snake Game | Kryptonite (read October 7, 2026)
- CISA: StopRansomware (read October 7, 2026)
- No More Ransom (read October 7, 2026)
- FTC: How to recognize, remove and avoid malware (read October 7, 2026)
- Microsoft Learn: Microsoft Defender Offline (read October 7, 2026)