.Aes_ni_0day file extension virus: what it is and how to remove it
.Aes_ni_0day file extension virus is a variant of AES-NI ransomware. It's a "special" version of the virus which is called NSA EXPLOIT EDITION.
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
Get a free scan and check if your PC is infected.
Fortect finds malware, unwanted programs and the Windows damage they leave behind, and repairs it in one pass.
If .Aes_ni_0day file extension virus keeps coming back after uninstalling, a scan can find what reinstalls it.
Do it yourself · free Remove .Aes_ni_0day file extension virus yourself 6 steps, about 18 minutes, no software needed.
Start the steps
.Aes_ni_0day file extension virus: summary
| Detection names | No Microsoft detection name is known |
|---|---|
| Ransom note | Not named in our report; the text of the note is not in our records |
| 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 | .Aes_ni_0day file extension virus |
| Type | File-encrypting ransomware |
| Symptoms | An unknown program in Installed apps |
| Evidence | 6 write-ups by security sites; details still limited |
| Free decryptor | No free decryptor is known (checked 7 October 2026) |
| First seen | 25 April 2017 |
| Facts checked | 7 October 2026 |
From our report of Apr 2017 · not reviewed since
More from our earlier report on .Aes_ni_0day file extension virus
- .Aes_ni_0day file extension virus is a new variant of AES-NI ransomware.
How .Aes_ni_0day file extension virus behaves
From our report of Apr 2017 · not reviewed since
.Aes_ni_0day file extension virus shows up as a new version of AES-NI ransomware
.Aes_ni_0day file extension virus is a variant of AES-NI ransomware.
It's a "special" version of the virus which is called NSA EXPLOIT EDITION. However, it behaves similarly like the original virus. The purpose of the ransomware is to encrypt databases, documents, audio, video, image and other files using a random AES-256 encryption key, which is encrypted with an RSA-2048 public key. In the ransom note called "!!!
READ THIS – IMPORTANT !!!.txt" authors of the ransomware inform how victims can unlock files that have .Aes_ni_0day file extension. People need to contact cyber criminals via provided email addresses and wait for the instructions how to obtain a private RSA key to restore data. Though the scenario is quite obvious - cyber criminals will ask to transfer particular amount of Bitcoins.
But instead of paying the ransom, victims should focus on .Aes_ni_0day removal. Cyber criminals may not provide safe and working decryption key. Besides, they might ask for more money and threaten to delete all the files. Ransomware is blackmailing program that must be terminated from the device using reputable security software, such as .
.Aes_ni_0day file virus attacks computers using various distribution strategies. After infiltration, malicious files and components are installed in the %System Drive%, %AppData% or %Windows% directories. Then it modifies Windows Registry to run the virus on the system startup, insert malicious code into legitimate Windows process svchost.exe, and deletes Shadow Volume Copies.
However, malware has one quite unique feature. As soon as it gets on the device, it checks whether the computer belongs to users from the former Soviet Union block, or not. If so, malware deletes itself. Otherwise, after the attack, people need to remove .Aes_ni_0day malware themselves.
Nevertheless, ransomware removal will not bring back access to the encrypted files; this step is crucial in order to protect your computer, data and personal information from other cyber threats. Once the virus is wiped out from the system, you can recover your files from backups or try alternative recovery methods.
From our report of Apr 2017 · not reviewed since
Distribution methods of the ransomware
.Aes_ni_0day file extension virus might infiltrate computers using malicious email attachments, exploit kits, drive-by downloads, and many other methods.
However, just like many other file-encrypting viruses, this one is also mostly distributed via emails. Crooks crafted numerous email examples where they inform about various issues and necessity to open an attached file. This file looks like safe Microsoft Office or PDF document; however, they might be obfuscated VBS script, JavaScript or executable files.
Thus, once users click on the malicious attachment, .Aes_ni_0day ransomware might sneak inside the computer and starts its damaging tasks. Moreover, this crypto-malware might pretend to be a legitimate software, crucial updates and any other important program or file that you can download from various online sources, such as Torrents, P2P Networks or file-sharing domains.
Also, this cyber infection can use flaws in computer's security and launch the attack with the help of exploit kit. Current rumours suspect that malware might be using Shadow Brokers' exploits.
The .Aes_ni_0day file extension virus ransom note
We did not record the full text of the ransom note in our report.
How to remove .Aes_ni_0day 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 .Aes_ni_0day 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
.Aes_ni_0day 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 .Aes_ni_0day file extension 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 .Aes_ni_0day 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 Apr 2017 · not reviewed since
Instructions for .Aes_ni_0day removal
In order to remove .Aes_ni_0day file extension virus from the device, you need to obtain reputable malware removal program.
As we already explained, malware injects malicious codes in legitimate system processes, and makes entries in Registry; thus, manual removal is nearly impossible without damaging the system. Only professional security software can delete malware safely from the device.
Before installing one of these tools, you may need to reboot your device to the Safe Mode with Networking. Unfortunately, .Aes_ni_0day removal won't restore encrypted files. For that, you need additional tools.
[GI=method-1]In order to perform automatic ransomware removal, you need to reboot your device to the Safe Mode with Networking. Then, install, update and run a full system can with your preferred security software several times.
[GI=method-2]System Restore also helps to disable .Aes_ni_0day file virus and run automatic removal with malware removal program.
Follow the steps below.
Windows Previous Versions feature allows accessing previously saved versions of the encrypted files
If System Restore method has been enabled before .Aes_ni_0day file virus attack, you can travel back in computer's time and copy individual files. Thus, this method is only effective and useful if you need to recover only a few files.
Decryptor for .Aes_ni_0day ransomware is not available 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
.Aes_ni_0day file extension virus could only hurt the files that had no second copy, and the signs (.Aes_ni_0day file extension 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 .Aes_ni_0day file extension virus
When will a decryptor for .Aes_ni_0day file extension 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 .Aes_ni_0day file extension virus family. A decryptor may need an original file, so keep any unencrypted copies too.
How did .Aes_ni_0day file extension virus get on my computer?
The way .Aes_ni_0day 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 .Aes_ni_0day file extension 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.
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.
Did .Aes_ni_0day file extension virus steal my files or passwords?
We do not know yet. Nothing published so far shows data theft by .Aes_ni_0day file extension virus, but the only confirmed sign is .Aes_ni_0day file extension 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 .Aes_ni_0day 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 .Aes_ni_0day file extension virus spread to other computers or OneDrive?
.Aes_ni_0day file extension virus encrypts the files that the infected PC can reach:
- its own drives
- USB disks
- mapped network drives
- shared folders
Synced folders such as OneDrive then upload the encrypted versions, which is why you should pause syncing straight away. Most consumer ransomware does not jump to other computers by itself, but business families are deployed on many machines by attackers who control the network.
Disconnect the PC, check other PCs and the NAS for the same file ending, and use OneDrive's version history to restore synced files once the PC is clean.
How do I open my .docx, .jpg and other files locked by .Aes_ni_0day file extension?
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 .Aes_ni_0day file extension 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 .Aes_ni_0day 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 .Aes_ni_0day 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
- Lifehacker: Ransomware Is Being Hidden Inside Attachments of Attachments (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)