AvosLocker ransomware: what it is and how to remove it

AvosLocker ransomware is a computer virus targetting insufficiently protected Windows devices. Unlike most threats of this type that encrypt victim files and then demand they purchase a necessary decryption tool, the article's culprit steals some or all private data and threatens to leak it to the general public if the ransom isn't paid.

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.

Automatic

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Fortect finds malware, unwanted programs and the Windows damage they leave behind, and repairs it in one pass.

A free scan checks for the encryptor still on the PC; it does not decrypt .avos files.

Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free.

Do it yourself · free Remove AvosLocker ransomware yourself 6 steps, about 18 minutes, no software needed.

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AvosLocker ransomware: avoslocker ransowmare
AvosLocker ransomware as our 2021 report showed it.

AvosLocker ransomware: summary

DistributionPhishing emails, file-sharing platforms, RDP attacks, drive-by downloads[2]
nameAvosLocker ransomware
TypeFile-locker, file virus
Symptoms of infectionPersonal files are renamed and can't be accessed; strange files appear on the desktop and in some affected folders; the infected device doesn't run properly
Ransom noteGET_YOUR_FILES_BACK.txt; the text is quoted in full below
Appended file extension.avos
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 14 more facts
criminal contact detailsVictims willing to contact their assailants have to download the Tor browser and go to avos2fuj6olp6x36.onion
Data recoveryBy paying the criminals, you could get scammed further. Try our recommended data recovery options
System repairYou have to fix all damages the cryptovirus caused to your system settings. The easiest way to do that is to perform system diagnostics with the time-proven [1] software
Detection namesNo Microsoft detection name is known
Encrypted file extension.avos
DecryptorNo free decryptor is known for this variant; check No More Ransom (nomoreransom.org) for updates
DamageNot recorded in the old report
NameAvosLocker ransomware
SymptomsFiles renamed with a new extension and a ransom note left in folders
Evidence4 write-ups by security sites; no sample analysed yet
Encrypted files.avos
Free decryptorNo free decryptor is known (checked 7 October 2026)
First seen16 July 2021
Facts checked7 October 2026
  • File extension: .avos
  • Note file: the ransom note

From our report of Jul 2021 · not reviewed since

More from our earlier report on AvosLocker ransomware

  • Remove the infection and any other malicious files or entries by scanning the entire system with a reliable anti-malware tool.
  • Free Ransomware Decryptors by Kaspersky

How AvosLocker ransomware behaves

From our report of Jul 2021 · not reviewed since

AvosLocker ransomware – a hazardous virus that steals data before encrypting it

AvosLocker ransomware is a computer virus targetting insufficiently protected Windows devices.

Unlike most threats of this type that encrypt victim files and then demand they purchase a necessary decryption tool, the article's culprit steals some or all private data and threatens to leak it to the general public if the ransom isn't paid.

It's easy to determine if the file-locker attacked your computer, as documents, pictures, videos, databases, archives, and other personal files are renamed by appending .avos extension to their original filenames. The data contents aren't manipulated, but it's rendered useless as you won't be able to access it.

AvosLocker ransomware uses a military-grade AES-256 encryption algorithm to lock up victim data, making it practically impossible to decode it without the intervention of the assailants. But paying the ransom might not you get the needed decryption software, as criminals can't be trusted.

After receiving the demanded amount in Bitcoins, the perpetrators might disappear, ask for more money, send a non-working tool, or instead of delivering the promised tool, and they might send additional malware. That's why we strongly recommend removing the file-locking parasite and trying out alternative data recovery methods.

Once the encryption of non-system data is completed, a ransom note GET_YOUR_FILES_BACK.txt is generated and dropped on the desktop and in affected folders so that the victims would easily find it wherever they look. It contains demands and instructions from the developers of AvosLocker virus:

As you can clearly see, the criminals are trying to push you into making rash decisions by stating that the ransom price will be doubled and some data leaked if you don't reach out to them within four days of the incident. If you don't establish contact within ten days, they threaten to leak all stolen files.

As we've already mentioned, you shouldn't contact the assailants as there's no guarantee that you'll ever receive a decryptor for .avos files. Moreover, you'd be condemning other innocent people int become victims, as the sent money would motivate the criminals and provide funding to increase their operations.

Since this infection is brand new, its ransom price is still unknown. It might be different for each victim depending on the region, if it's a company or an individual, etc. Unlike many ransomware developers, the distributors of the article's culprit want to be contacted through their built website avos2fuj6olp6x36.onion. If you enter it, you'd see the following screen:

Victims would then have to enter their unique ID provided in the ransom note, and the payment details would be revealed. Other cybersecurity experts and we strongly recommend staying away from the site and not contacting your assailants. In the next chapter, we'll show you how you can easily remove it.

AvosLocker ransomware: avoslocker ransowmare
AvosLocker ransomware in our 2021 report.
AvosLocker ransomware: avoslocker ransom page en
AvosLocker ransomware in our 2021 report.

The AvosLocker ransomware note

Text of the ransom note

Attention!

Your files have been encrypted using AES-256.

We highly suggest not shutting down your computer in case encryption process is not finished, as your files may get corrupted.

In order to decrypt your files, you must pay for the decryption key & application.

You may do so by visiting us at hxxx: //avos2fuj6olp6x36.onion.

This is an onion address that you may access using Tor Browser which you may download at hxxxs: //www.torproject.org/download/ Details such as pricing, how long before the price increases and such will be available to you once you enter your ID presented to you below in this note in our website.

Hurry up, as the price may increase in the following days.

Message from agent: If you fail to respond in 4 days, the cost of decryption will double up and we will leak some of your data.

In 10 days, we will leak all the data we have.

Your ID: ********

How to remove AvosLocker 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 AvosLocker ransomware 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.

  1. Step 1: Disconnect the PC and unplug backup drives

    AvosLocker ransomware 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 quick settings with Wi-Fi turned off
    Windows 11: turn off Wi-Fi to take the PC offline.

    Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files

  2. Step 2: Save the ransom note and confirm the family

    Copy the ransom note and one or two files ending in .avos to a USB stick, and leave the originals where they are.

    From another device, upload the note and a sample file to ID Ransomware or No More Ransom's Crypto Sheriff, which name the family from the note, the extension and the file structure.

    Write down the contact address and your personal ID from the note, because a decryptor or the police may ask for them.

    Warning: Never contact the attackers from the infected Windows 11 or Windows 10 PC.

    A ransom note text file next to encrypted files in File Explorer
    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

  3. Step 3: Check for a free decryptor

    For AvosLocker ransomware, 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

  4. Step 4: Remove the ransomware before you restore or decrypt

    Restoring or decrypting files while AvosLocker ransomware 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 Security Scan options with Microsoft Defender Antivirus offline scan selected
    Windows 11: Windows Security > Virus & threat protection > Scan options.

    Full procedure with screenshots: Run a Microsoft Defender Offline scan

  5. 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.

    Command Prompt running vssadmin list shadows
    Windows 11: vssadmin list shadows shows whether shadow copies exist.

    Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files

  6. 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

From our report of Jul 2021 · not reviewed since

Step-by-step instructions to remove AvosLocker ransomware and repair system damage

We're very glad you didn't decide to enrich your assailants and instead remove the file-locking parasite.

Before we begin, please copy all encrypted files to a USB thumb drive, SSD, or another offline storage device. It's safe to do that as the encrypted data doesn't contain any malicious scripts. You can skip that if you've kept backups of all your data.

Then you will need to download a trustworthy anti-malware tool capable of detecting and fully removing any cyber infection. We highly recommend downloading the as this time-proven will locate and remove AvosLocker ransomware with all its components.

If the article's culprit has any similarities to Gujd and Wwka viruses, you might be prevented from visiting any security-related pages, and hence, you won't be able to download any security software. If that's the case, you can overcome that by doing that in Safe Mode with Networking. Here are simple instructions on how to access it:

When you reach Safe Mode, you can easily visit any website and download anything you like. If you don't like the aforementioned tool for any reason, you can try alternative software such as the . Its virus detection engine is as good as the previous one's, but its GUI (graphic user interface) might be more suitable for some users.

Either anti-malware toll you choose to remove AvosLocker ransomware, please do it immediately. All you have to do is download your preferred software and install it, update its virus database with the latest definitions, and perform a full system scan. The scan will show all infections and suggest terminating them. Please do so.

File-locking parasites can be spread in many ways, from phishing emails to file-sharing platforms. It's essential to have proper cybersecurity software to ensure that you and your device won't become the next victims of cybercrime. By updating and using such software daily, you'd raise the security bar very high.

Ransomware infections do extensive damage to system files and folders to establish persistence. Therefore, once you get rid of the file-locker virus and all of its components, you have to think about repairing affected system sectors. Unfortunately, you won't be capable of doing it yourself, as editing the wrong file might result in complete system failure.

Furthermore, it's extremely hard to find each and every system sector that AvosLocker file virus might have altered.

During system diagnostics, its patented technology will identify each and every modification done to the system and automatically repair it. Since it's got a trial version, you can use it and remove it if you don't like it. Nonetheless, we vouch for it, and here's how to get it:

Only after scanning your computer with anti-malware software to remove AvosLocker and removing all of its traces by performing system diagnostics, it's safe to recover your data from backups, of course, if you've kept them. If not, please proceed to the next step.

  • Right-click on the Start button and select Settings.
  • On the left side of the window, pick Recovery.
  • Click Restart now.
  • Select Troubleshoot.
  • Go to Advanced options.
  • Select Startup Settings.
  • Click Restart.
  • Press 5 or click 5) Enable Safe Mode with Networking.
  • Download the application by clicking on the link above
  • Click on the ReimageRepair.exe
  • If User Account Control (UAC) shows up, select Yes
  • Press Install and wait till the program finishes the installation process
  • The analysis of your machine will begin immediately
  • Once complete, check the results - they will be listed in the Summary
  • You can now click on each of the issues and fix them manually
AvosLocker ransomware: update security 1
AvosLocker ransomware in our 2021 report.
AvosLocker ransomware: advanced options 1
AvosLocker ransomware in our 2021 report.

From our report of Jul 2021 · not reviewed since

Best possible data recovery options

This chapter contains alternative .avos file recovery methods.

Please be warned that there's no guarantee that these techniques will work 100% in your case, as the article's culprit is a brand new ransomware strain, and these methods haven't yet been tested on it.

But it's still a better option than enriching cybercriminals who, with your money, would attack more innocent people and develop more advanced malware and more sophisticated means of distributing it. And, as we've mentioned before, there's no guarantee that the criminals would deliver on their promise to give you the needed decryption tools.

Since it's not yet known if .avos file virus belongs to any ransomware family, you might have to try a lot of different decryptors. We've posted hyperlinks to the four best options for decryption software below and hope that at least one of them will be the right one for you:

If none of the decryptors worked for you, all is not lost. We've been in the business of helping people get out of sticky situations for over two decades, so we've compiled a lot of knowledge through the years. There's one more app that could help to recover .avos files.

And here's how you use it:

If this recovery software didn't help you either, you have to stay positive. Sometimes it takes years for a working decryption tool to be developed. Keep the encrypted data that you've copied to an external storage device and keep your fingers crossed. And please remember to use reliable anti-malware tools so that you can evade such nightmares.

  • No More Ransom Project
  • Free Ransomware Decryption Tools from Emsisoft
  • Download .
  • Double-click the installer to launch it.
  • Follow on-screen instructions to install the software.
  • As soon as you press Finish, you can use the app.
  • Select Everything or pick individual folders where you want the files to be recovered from.
  • Press Next.
  • At the bottom, enable Deep scan and pick which Disks you want to be scanned.
  • Press Scan and wait till it is complete.
  • You can now pick which folders/files to recover - don't forget you also have the option to search by the file name!
  • Press Recover to retrieve your files.
AvosLocker ransomware: 1 24
AvosLocker ransomware in our 2021 report.
Screenshot of AvosLocker ransomware: stellar2
AvosLocker ransomware in our 2021 report.

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

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

AvosLocker ransomware could only hurt the files that had no second copy, and the signs (files that end in .avos and no longer open) 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.

Stream videos without limitations, no matter where you are

There are multiple parties that could find out almost anything about you by checking your online activity.

While this is highly unlikely, advertisers and tech companies are constantly tracking you online. The first step to privacy should be a secure browser that focuses on tracker reduction to a minimum.

Even if you employ a secure browser, you will not be able to access websites that are restricted due to local government laws or other reasons. In other words, you may not be able to stream Disney+ or US-based Netflix in some countries. To bypass these restrictions, you can employ a powerful VPN, which provides dedicated servers for torrenting and streaming, not slowing you down in the process.

Data backups are important - recover your lost files

Ransomware is one of the biggest threats to personal data.

Once it is executed on a machine, it launches a sophisticated encryption algorithm that locks all your files, although it does not destroy them. The most common misconception is that anti-malware software can return files to their previous states. This is not true, however, and data remains locked after the malicious payload is deleted.

While regular data backups are the only secure method to recover your files after a ransomware attack, tools such as can also be effective and restore at least some of your lost data.

Questions about AvosLocker ransomware

Is there a decryptor for .avos files?

That depends on the family behind the .avos extension, which this guide cannot confirm yet from the reports alone. Check No More Ransom and ID Ransomware with your ransom note and one encrypted file; they list families with free tools.

If none exists today, keep the encrypted files and a copy of the note on a separate drive, because decryptors are sometimes published months later after flaws are found or servers are seized. Never buy a decryptor from a website that is not the security company that made it.

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.

How do I open .avos files?

You cannot open them by renaming or by choosing another program. The .avos ending shows that AvosLocker ransomware 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 AvosLocker ransomware. Store the encrypted files on an external disk until then.

Did AvosLocker ransomware steal my files or passwords?

We do not know yet. Nothing published so far shows data theft by AvosLocker ransomware, but the only confirmed sign is files that end in .avos 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.

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 AvosLocker ransomware get on my computer?

The way AvosLocker ransomware 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 .avos 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 AvosLocker ransomware 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.

Should I open the ransom note?

Reading it is fine if you open it in Notepad. A plain text the ransom note cannot harm the PC. Be careful with notes in HTA or HTML format: double-clicking those runs them in a window that can contain scripts, so right-click and choose Open with > Notepad instead.

The note tells you the contact addresses, the claimed amount and the deadline. Do not visit links or write to the addresses from this PC. Use the note to identify the family and check for a free decryptor first.

Will .avos spread to my other drives?

It can. Ransomware encrypts every drive and network share it can reach while it runs, so external disks, USB sticks and shared folders connected during the attack may also have files ending in .avos. Disconnect everything now, then check each device from a clean computer.

Do not plug a backup drive into the infected PC until the ransomware has been removed with an offline scan. Cloud folders such as OneDrive sync the encrypted versions, but they keep earlier versions you can usually restore.

Will Fortect remove AvosLocker ransomware?

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 AvosLocker ransomware, 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

  1. Wikipedia: Advanced Encryption Standard (read October 7, 2026)
  2. Virukset: Virukset (read October 7, 2026)
  3. CISA: StopRansomware (read October 7, 2026)
  4. No More Ransom (read October 7, 2026)
  5. FTC: How to recognize, remove and avoid malware (read October 7, 2026)

More removal guides

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