.zzz File Extension virus: what it is and how to remove it
.zzz File Extension virus is a malicious program which seeks to block users' files by adding a .zzz file extension to each of the infected items. This malware is attributed to the ransomware category because the main thing that it seeks, is to make its victims pay the ransom in exchange for a special key needed for decrypting encrypted files.
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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.zzz File Extension virus: summary
| Detection names | No Microsoft detection name is known |
|---|---|
| Ransom note | Not recorded in our earlier report |
| Contact | Not recorded in our earlier report |
| Encrypted file extension | .zzz |
| 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 9 more facts
| Damage | Not recorded in the old report |
|---|---|
| Name | .zzz File Extension virus |
| Type | File-encrypting ransomware |
| Symptoms | Files renamed with a new extension |
| Evidence | 5 write-ups by security sites; details still limited |
| Encrypted files | .zzz |
| Free decryptor | No free decryptor is known (checked 6 October 2026) |
| First seen | 2 February 2016 |
| Facts checked | 6 October 2026 |
- File extension:
.zzz
From our report of Feb 2016 · not reviewed since
More from our earlier report on .zzz File Extension virus
- If you haven't got any extra copies of your files, you can try these tools: R-Studio, Photorec or Kaspersky virus-fighting utilities.
How .zzz File Extension virus behaves
From our report of Feb 2016 · not reviewed since
What is the purpose of .zzz File Extension virus?
.zzz File Extension virus is a malicious program which seeks to block users' files by adding a .zzz file extension to each of the infected items.
This malware is attributed to the ransomware category because the main thing that it seeks, is to make its victims pay the ransom in exchange for a special key needed for decrypting encrypted files. Please, do NOT support hackers by paying the ransom because there is no guarantee that you will get your files back!
As soon as .zzz File Extension virus malware enters the system, it runs a scan and tries to find needed files. Typically, it searches for the following extensions:
- .docx
- .docm
- .xls
- .xlsx
- .ppt
- .pptx
- .pptm
- .eps
- .ai
- .indd
- .cdr
- .dng
- .lnk
- .jpg
- .png
- .pdd
- .doc
- .jfif
- .jpeg
- .gif
- .bmp
- .exif
- .txt
- .wps
- .mp3
Once it finds needed files, it encrypts them using RSA-2048 encryption algorithm . Also, it starts showing a huge warning message that informs the victims that hey have to pay a ransom in exchange for the ability to use their files again.
Having in mind the fact that this ransomware is capable of affecting photos, music files, videos, business documents and even art, we assume that there are hundreds of PC users who have already paid the ransom for the developers of .zzz File Extension ransomware.
Nevertheless, we highly recommend not to collaborate with the extortionists and refuse to do what they ask you to. As soon as you discovering that you are affected by this ransomware, disconnect your computer from the Internet immediately. Then, make sure that you scan your machine with the reliable anti-spyware to remove .zzz File Extension virus from the system.
For that, you can use anti-malware. Finally, when the .zzz File Extension removal is done, you should try decrypting your files. However, we should warn you not to expect these utilities to roll back your system to its initial. Do not forget you are dealing with an advanced malware, after all.
If we were to summarize the main zzz File Extension features, we would come up with such a list:
- This virus belongs to the ransomware category;
- It infiltrates computers with the help of infected email attachments ;
- .zzz File Extension encrypts files using RSA-2048 algorithm;
- It adds .zzz extension to each of affected files;
- .zzz File Extension virus removal does not help to recover affected files.
From our report of Feb 2016 · not reviewed since
How can I get infected with this threat?
Typically, .zzz File Extension ransomware and other viruses of this type spread around as "important" email messages.
A trojan horse, which is supposed to infect the system with this cyber threat, is mostly hidden inside the attachment. To trick users into downloading it, the email message presents itself as a warning from some governmental authority, etc. To protect yourself from infected email attachments, you should double check each message before opening it.
Firstly, you should check the sender, then read the entire body of the message . If it looks too good to be true or if it filled with a typo or grammar mistakes, you should delete it. Of course, we highly recommend installing a reliable anti-spyware for preventing unwanted programs and dangerous viruses.
When infected with .zzz File Extension, it could seem that paying a ransom is the only way to recover your files. As a rule, such threats usually require a ransom of $300 - $500.
However, you should always take into account the fact that there is no guarantee that this payment will help you to get a special key needed for the decryption of your files. To prevent the loss of your files AND your money, you should follow a guide given in the next page of this post.
How to remove .zzz File Extension 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 .zzz File Extension 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
.zzz File Extension 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 .zzz File Extension virus, no free decryptor is known (checked 6 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 .zzz File Extension 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 Feb 2016 · not reviewed since
How to remove .zzz File Extension ransomware from my computer?
If your computer is infected with .zzz File Extension virus and you cannot open any of your files, you should first disconnect your machine from the Internet.
Please, do that as soon as possible to prevent the further loss of your files. Now, you can proceed with the .zzz File Extension removal. To clean up the computer, you must exterminate all the malicious files the virus has deployed on your computer.
It is a painstakingly long and risky procedure if you decide to do it manually. The elimination guide below should help you do that. Besides, just below the removal instructions you will also find alternative suggestions for the data recovery.
[GI=method-1].zzz File Extension ransomware may try blocking your antivirus and preventing it from running a systems scan.
[GI=method-2]There are many ways in which .zzz File Extension ransomware may to prevent its removal from the computer. One of these techniques is security software blocking. The step-by-step guide below explains how to decontaminate the antivirus blocking capacities easily and without risking to damage your system.
It can also be used for data recovery after the files have been encrypted by some malicious ransomware. You should give this tool a try. Instructions how to use it are given here:
How can Windows Previous Versions feature serve in data recovery after ransomware attack?
Windows Previous Versions feature allows recovering file versions from a specific time in the past. Nevertheless, there are some flaws to this method. First, it can not be applied for the entire system recovery and second, it only works if the System restore function was enabled on the computer before virus attack. Given the right conditions, you may try recovering your files following these steps:
Putting ShadowExplorer in use for the data recovery:
To recover your data with ShadowExplorer, you have to make sure the virus has not deleted the Volume Shadow Copies of encrypted files. If the files have been deleted, this recovery method will not work. Here, we provide a short guide to help you operate ShadowExplorer more easily.
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 .zzz 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.
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 .zzz File Extension virus
How do I open .zzz files?
You cannot open them by renaming or by choosing another program. The .zzz ending shows that .zzz File Extension virus 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 .zzz File Extension virus. Store the encrypted files on an external disk until then.
When will a decryptor for .zzz File Extension virus be released?
Nobody can promise a date. When we last checked, on 6 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 .zzz File Extension virus family. A decryptor may need an original file, so keep any unencrypted copies too.
How did .zzz File Extension virus get on my computer?
The way .zzz File Extension 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 files that end in .zzz 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.
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.
Did .zzz File Extension virus steal my files or passwords?
We do not know yet. Nothing published so far shows data theft by .zzz File Extension virus, but the only confirmed sign is files that end in .zzz 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.
Is .zzz File Extension 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 just remove .zzz from the file names?
You can try it on a copy, but for real ransomware it will not help. The .zzz 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 .zzz attack?
Reinstalling removes the ransomware but not the encryption: your files ending in .zzz 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 .zzz File Extension 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 .zzz File Extension 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
- Wikipedia: RSA (cryptosystem) (read October 6, 2026)
- Digital inspiration: Is that email attachment Clean or Infected with some virus ? (read October 6, 2026)
- CISA: StopRansomware (read October 6, 2026)
- No More Ransom (read October 6, 2026)
- FTC: How to recognize, remove and avoid malware (read October 6, 2026)