Kazkavkovkiz ransomware: what it is and how to remove it
Kazkavkovkiz ransomware is yet another crypto-malware that that does not belong to any previously known parasites of the same kind. While it may not have any connections to formerly known ransomware families, its goal remains the same - lock all personal files located on the machine and connected networks, and then demand ransom to be paid in cryptocurrency for the tool that can decipher the inaccessible data.
Facts checked October 6, 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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Kazkavkovkiz ransomware: summary
| Name | Kazkavkovkiz |
|---|---|
| Type | Ransomware, cryptovirus |
| Encryption method | This virus uses symmetric encryption algorithm AES to lock all personal files on the local and networked drives |
| Related files | Encrypted.zip |
| File extension | A combination of four random numbers is applied at the end of each affected file, such as .1401, .1503 |
| Contact details | Users are asked to contact cybercriminals via kazkavkovkiz@cock.lli or Hariliuios@tutanota.com emails |
| 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 15 more facts
| Primary targets | The malware was spotted attacking corporations |
|---|---|
| Infiltration means | Most commonly, hackers use multiple different infection vectors, such as spam emails, exploit kits, fake updates, software cracks and repacked installers, brute-force attacks, etc. |
| File recovery | Recovering data is only possible via backups, as there is no working decryptor that would retrieve your files for free. However, you may try or a few alternative methods we provide in the bottom section |
| Detection names | No Microsoft detection name is known |
| Ransom note | Not recorded in our earlier report |
| Encrypted file extension | .1401 |
| Decryptor | No free decryptor is known for this variant; check No More Ransom (nomoreransom.org) for updates |
| Distribution | Not recorded in the old report |
| Damage | Not recorded in the old report |
| Symptoms | Files renamed with a new extension |
| Evidence | 5 write-ups by security sites; details still limited |
| Encrypted files | .1401 |
| Free decryptor | No free decryptor is known (checked 6 October 2026) |
| First seen | 16 October 2019 |
| Facts checked | 6 October 2026 |
- File extension:
.1401
From our report of Oct 2019 · not reviewed since
More from our earlier report on Kazkavkovkiz
- To get rid of ransomware infection, you should employ anti-malware software such as or .
- In some cases, accessing Safe Mode may be required, as the virus may hinder the operation of security program
- -- Our encryption algorithms are very strong and your files are very well protected, you can't hope to recover them without our help.
- The only way to get your files back is to cooperate with us and get the decrypter program.
- Do not try to recover your files without a decrypt program, you may damage them and then they will be impossible to recover.
- For us this is just business and to prove to you our seriousness, we will decrypt you some files for free, but we will not wait for your letter for a long time, mail can be abused, we are moving on, hurry up with the decision.
- Сontact us: 1.kazkavkovkiz@cock.li 2.Hariliuios@tutanota.com Don't forget to include your code in the email:
How Kazkavkovkiz ransomware behaves
From our report of Oct 2019 · not reviewed since
Kazkavkovkiz ransomware is file locking malware that uses AES encryption method to lock pictures, videos, and other personal files on the target Windows system
Kazkavkovkiz ransomware is yet another crypto-malware that that does not belong to any previously known parasites of the same kind.
While it may not have any connections to formerly known ransomware families, its goal remains the same - lock all personal files located on the machine and connected networks, and then demand ransom to be paid in cryptocurrency for the tool that can decipher the inaccessible data. Kazkavkovkiz ransomware was spotted attacking corporations, although it does not prevent it from being spread to regular users as well.
Kazkavkovkiz ransomware performs the encryption using the AES encryption algorithm and appends a random extension that consists of numbers (so far, only four-digit markers were spotted in the wild, for example, .1401, .1503).
Users can then view a ransom note that claims data recovery is not possible unless they contact crooks at kazkavkovkiz@cock.lli or Hariliuios@tutanota.com. Most likely, cybercriminals will demand to pay a ransom in Bitcoin or other digital currency in order for victims to recover the key that can unlock Kazkavkovkiz-locked files.
There is still not much known about the Kazkavkovkiz virus so far, as researchers still did not manage to get their hands on malware sample to analyze it.
However, just like any other ransomware, it poses significant dangers to victims, as it can result in permanent data loss. Nevertheless, the dropper, Encrypted.zip, was recently posted on Virus Total and was marked as "clean" by all security vendors, which is an extremely alarming situation.
But before that, you need to make sure that Kazkavkovkiz removal is performed, or the recovery process will be useless.
Kazkavkovkiz ransomware most likely spreads with the help of typical malware distribution means, such as:
Once inside the system, Kazkavkovkiz ransomware will perform the necessary system changes (such as Windows registry modification and deletion of Shadow Volume Copies) and then scan the computer and the connected devices/networks for data to encrypt.
The virus will target most commonly used files, such as .pdf, .zip, .doc, .mp4, .jpg, ,mdf, .pptx, and many others, to cause maximum damage. Once encrypted, a file turns into something like "filename.xls.1401" and is no longer accessible.
The ransom note, a name of which is yet unknown, is dropped for victims to see the relevant information. Kazkavkovkiz ransomware developers say the following:
While paying cybercriminals is one of the options when trying to recover files encrypted by Kazkavkovkiz virus, security experts highly discourage it, as hackers may simply never provide a decryptor, or it might not work in the first place. There are alternative solutions that you can try when trying to restore data - if you had backups, you would be able to recover from malware infection with no problems.
However, before that, you need to remove Kazkavkovkiz ransomware from your computer - you should employ anti-malware software for that, such as or . Once you delete the malware and all its components, only then you can connect your backup devices; otherwise, all the restored data would be encrypted once again.
- Spam email attachments and malicious hyperlinks
- Exploit kits and software vulnerabilities
- Pirated software installers, as well as cracks/keygens
- Fake updates that download a malicious executable
- Unprotected RDP connections that rely on the default TCP port, etc.


From our report of Oct 2019 · not reviewed since
Don't get tricked by crybercriminals and avoid ransomware infections
Malware developers are usually sophisticated individuals, constantly implementing more effective ways of infecting as many hosts as possible.
For that, they employ various tactics, and while some may be more advanced than the others, most of them make use of some sort of social engineering. Conclusively, users install malware themselves, usually because of a lack of experience in the IT field or negligence.
Therefore, it is important to know what kind of situations are better to avoid when dealing with with online content. The early malware mainly relied on spam emails and contaminated external storage devices to propagate, and, while the former is still very relevant, hackers moved on to much more effective methods.
You should make sure that your computer is adequately protected with anti-malware software that scans the incoming traffic and would able to stop any malicious executables from being launched. However, security tools are no longer enough, and you should also remember to do the following:
- Make sure you Windows OS is patched with the latest security updates
- Employ additional tools for protection, such as Firewall and ad-block
- Avoid high-risk websites such as torrents, porn, gambling, etc.
- Never download software cracks or illegal programs from unknown sites
- Use strong passwords for all your accounts, and pay close attention to RDP if you are using it - do not use the default TCP port 3389
- Never allow an email attachment to run macro commands
- Scan unknown files with tools like Virus Total.

How to remove Kazkavkovkiz ransomware
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 Kazkavkovkiz 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
Unplug the network cable or turn off Wi-Fi, and disconnect USB drives, external disks and network shares, so Kazkavkovkiz cannot reach more files. Pause OneDrive, Google Drive or Dropbox sync, because synced folders upload the encrypted copies over the good ones.
Leave the PC on but offline while you read the next steps, since a restart can let the ransomware run again. This applies to Windows 11 and Windows 10 alike.

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
The name of the family decides whether a free decryptor can help. Copy the ransom note and two small encrypted files to a USB stick, and check them on another device with ID Ransomware or Crypto Sheriff.
Note the extension added to the files, the contact address and the victim ID shown in the note. Keep the originals on the Windows 11 or Windows 10 PC untouched.

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
Our last check found that for Kazkavkovkiz, no free decryptor is known (checked 6 October 2026). Look again yourself in the No More Ransom list and the free decryptor pages of Emsisoft, Avast and Kaspersky, which add new families every year.
A decryptor needs the ransomware gone first, or it encrypts the files again. Keep at least one copy of the encrypted files on an external drive, even if no tool works yet.
Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 4: Remove the ransomware before you restore or decrypt
Removing Kazkavkovkiz does not bring the files back, but it has to come first. Start with Defender's Full scan, then the offline scan from the same Scan options page, which checks the disk before Windows loads.
If the scan cannot start, use Safe Mode with Networking. Delete the ransom notes only after you have saved a copy, because removal tools sometimes leave them behind on Windows 11 and 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
Windows keeps shadow copies for restore points and backups, and some ransomware fails to delete them.
vssadmin list shadowsin an administrator Command Prompt tells you at once whether any exist.If they do, right-click the folder that held your files, open Properties > Previous Versions, select a version from before the attack, and click Open to check it before you Restore or copy the files out. Windows 11 and Windows 10 both have the tab.

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
A backup made before the attack is the surest way back. Connect it only once the PC is clean, then restore from File History, Windows Backup, OneDrive's Restore your OneDrive or your own external copies.
Without a backup, try file recovery: the originals that Kazkavkovkiz deleted may still be on the disk until something overwrites them. Install nothing new on the drive you want to recover from on the Windows 11 or Windows 10 PC.
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 Oct 2019 · not reviewed since
Take your time to remove Kazkavkovkiz ransomware before you proceed with data recovery
Kazkavkovkiz virus is a relatively new threat, so it is yet unknown which security applications would be able to recognize it.
However, most of the anti-malware tools are equipped with behavioral analysis functions that are capable of catching malware, which was previously not seen in the wild. Therefore, you might need to try several programs before you succeed with Kazkavkovkiz ransomware removal - we suggest using or .
In some cases, you might have to enter Safe Mode in order to remove Kazkavkovkiz ransomware, as it may tamper with your anti-malware software (parasites often include functions that may disable or impair security applications installed on the host machine). Once in the security environment, perform a full system scan to eliminate all the malicious components of malware.
As for file recovery, check the solutions below. If they do not help, and you have no backups, you will have to wait till security experts discover vulnerabilities within Kazkavkovkiz ransomware and manage to develop a working decryptor.
[GI=method-1]In case Kazkavkovkiz virus is tampering with your security software, access Safe Mode as follows:
[GI=method-2]System Restore is another method you could use for malware removal:
Windows Previous Versions feature may be able to recover separate files
If you had System Restore enabled before the ransomware attack, you might be able to recover each file individually by using Windows Previous Versions feature.
In some cases, ShadowExplorer may be the help that you need
ShadowExplorer should be able to recover all your files if the virus failed to eliminate Shadow Copies from your machine.
No decryptor is currently available
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.
Protect the files you restore
Restore only after the scans are clean and the PC no longer shows files that end in .1401 and no longer open; otherwise the restored copies can be damaged again.
Then build a backup that survives the next infection:
- one copy in the cloud with version history
- one on an external drive that is disconnected between backups
- the working copy on the PC
Version history matters because a backup that syncs damaged files overwrites the good ones.
How to do this with the tools built into Windows: the 3-2-1 backup rule on Windows.
Do not let government spy on you
The government has many issues in regards to tracking users' data and spying on citizens, so you should take this into consideration and learn more about shady information gathering practices.
Avoid any unwanted government tracking or spying by going totally anonymous on the internet.
You can choose a different location when you go online and access any material you want without particular content restrictions. You can easily enjoy internet connection without any risks of being hacked by using VPN.
Control the information that can be accessed by government any other unwanted party and surf online without being spied on. Even if you are not involved in illegal activities or trust your selection of services, platforms, be suspicious for your own security and take precautionary measures by using the VPN service.
Backup files for the later use, in case of the malware attack
Computer users can suffer from data losses due to cyber infections or their own faulty doings.
Ransomware can encrypt and hold files hostage, while unforeseen power cuts might cause a loss of important documents. If you have proper up-to-date backups, you can easily recover after such an incident and get back to work. It is also equally important to update backups on a regular basis so that the newest information remains intact - you can set this process to be performed automatically.
When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware strikes out of nowhere. Use for the data restoration process.
Questions about Kazkavkovkiz ransomware
How do I open .1401 files?
You cannot open them by renaming or by choosing another program. The .1401 ending shows that Kazkavkovkiz encrypted the content, and only the matching key can reverse it. Renaming a file back to .docx or .jpg changes nothing except the icon, and it can confuse a future decryptor, so leave the names as they are.
To get the content back, use a backup, an unencrypted copy elsewhere, or a decryptor listed on No More Ransom if one exists for Kazkavkovkiz. Store the encrypted files on an external disk until then.
Is there a free Kazkavkovkiz decryptor?
We last checked on 6 October 2026, and for Kazkavkovkiz no free decryptor is known. We check No More Ransom, which collects free tools from police and security companies, and the decryptor pages of the major antivirus vendors. A working decryptor exists only when the encryption has a flaw or the keys were leaked or seized.
Ignore sites and videos that offer a "Kazkavkovkiz decryptor" for download or for a fee: these are usually scams or malware. Real decryptors are free and come from known security companies or law enforcement. Keep the encrypted files in case a tool appears later.
Did Kazkavkovkiz steal my files or passwords?
We do not know yet. Nothing published so far shows data theft by Kazkavkovkiz, but the only confirmed sign is files that end in .1401 and no longer open, 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.
Should I pay the ransom?
We advise against it, and so do the FBI, Europol and national cyber agencies. Payment does not guarantee a working tool: some attackers never reply, some tools damage files, and some variants have no decryptor at all. Paying also funds further attacks and can make you a target again.
Before considering payment, try every recovery option in this guide and report the attack. Companies must involve their legal adviser and insurer, because payments to sanctioned groups can be illegal. If files are truly irreplaceable, store the encrypted copies and wait; decryptors sometimes appear later.
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.
How did Kazkavkovkiz get on my computer?
The way Kazkavkovkiz 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 files that end in .1401 and no longer open, and check the Downloads folder and Installed apps sorted by date. Keep anything suspicious for your report, but do not run it again.
Is Kazkavkovkiz 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 just remove .1401 from the file names?
You can try it on a copy, but for real ransomware it will not help. The .1401 extension is only a label; the file content has been scrambled with a key the attackers hold.
If a renamed copy opens normally, the malware only renamed files, which happens with some fake ransomware, and you can rename the rest back. If it does not open, leave the files as they are. Renaming encrypted files can confuse a decryptor later, so always work on copies.
Should I reinstall Windows after the .1401 attack?
Reinstalling removes the ransomware but not the encryption: your files ending in .1401 stay encrypted afterwards. So first copy the encrypted files and the ransom note to a separate drive, in case a decryptor appears later. Then decide:
- a clean-up with an offline scan is often enough for home PCs
- while a full reset is safer if remote access was involved
- scans keep finding new items
Restore your backups only after the PC is clean, and change passwords from another device.
Will Fortect remove Kazkavkovkiz?
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 Kazkavkovkiz, 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
- SearchSecurity: Advanced Encryption Standard (AES) (read October 6, 2026)
- Virus Total: Encrypted.zip (read October 6, 2026)
- Wikipedia: Vulnerability (computing) (read October 6, 2026)
- Lesvirus: Lesvirus (read October 6, 2026)
- CISA: StopRansomware (read October 6, 2026)