Aieou virus, Aieou malware, .aieou ransomware: what it is and how to remove it
Aieou ransomware is a virus that is created for money extortion. Criminals behind the threat focus on getting cryptocurrency.
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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Aieou virus, Aieou malware, .aieou ransomware: summary
| Distribution | Torrent sites, Spam emails |
|---|---|
| Name | Aieou virus, Aieou malware, .aieou ransomware |
| Type | Ransomware |
| Appended extension | All affected files are appended with .aieou extension |
| Ransom note | README.txt |
| Ransom amount | 1 Bitcoin is requested to decrypt personal data |
| 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 12 more facts
| Contact details | cce_2020_final@cce2020.kr |
|---|---|
| Detection names | No Microsoft detection name is known |
| Encrypted file extension | .aieou |
| Decryptor | No free decryptor is known for this variant; check No More Ransom (nomoreransom.org) for updates |
| Damage | Not recorded in the old report |
| Symptoms | Files renamed with a new extension and a ransom note left in folders |
| Evidence | 4 write-ups by security sites; no sample analysed yet |
| Encrypted files | .aieou |
| Attacker contacts | cce_2020_final@cce2020.kr |
| Free decryptor | No free decryptor is known (checked 6 October 2026) |
| First seen | 3 November 2020 |
| Facts checked | 6 October 2026 |
- File extension:
.aieou - Note file:
README.txt - Contact:
cce_2020_final@cce2020.kr
From our report of Nov 2020 · not reviewed since
More from our earlier report on Aieou virus, Aieou malware, .aieou ransomware
- To remove .Aieou virus victims should use a powerful and dependable anti-malware software
- Use the tool to eradicate the impact that the Aieou ransomware did to the computer system files
The Aieou virus, Aieou malware, .aieou ransomware note
Your files were infected with ransomware and encrypted.
If you wish to recover, please contact the email address below and pay 1 BTC or more.
cce_2020_final@cce2020.kr
How to remove Aieou virus, Aieou malware, .aieou 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 Aieou virus, Aieou malware, .aieou 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.
Step 1: Disconnect the PC and unplug backup drives
Aieou virus, Aieou malware, .aieou 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: 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 confirm the family
Copy
README.txtand one or two files ending in.aieouto 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.

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 Aieou virus, Aieou malware, .aieou ransomware, 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 Aieou virus, Aieou malware, .aieou 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 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 Nov 2020 · not reviewed since
Aieou ransomware - cryptovirus that asks 1 Bitcoin for file decryption
Aieou ransomware is a virus that is created for money extortion.
Criminals behind the threat focus on getting cryptocurrency. As soon as the malware gets access to a computer, it immediately starts non-system data encryption. All users' personal files are appended with a .aieou extension. From that moment, victims won't be able to open those files until they pay a ransom.
After the lockage of non-system files is completed, a ransom note named "README.txt" is created inside all affected folders. The message itself is very brief and just informs the victims that their files are encrypted and that a staggering 1 BTC (one Bitcoin) is required to unlock them.
Then a contact email is provided - victims are asked to send an email to cce_2020_final@cce2020.kr. Although the Bitcoin price fluctuates, it's equivalent to around thirteen thousand dollars. If users haven't kept backups, paying the cybercriminals might seem like the only way out. As always, we advise against it.
According to VirusTotal.com , 42 out of 70 antivirus (AV) detection engines caught the ransomware. This once again shows the importance of acquiring a trustworthy AV that prevents from threats hiding in the shadows. Time-proven tools like and will not only remove Aieou ransomware but also protect from future perils.
The bad news is, users won't retrieve their encrypted data after successful Aieou ransomware removal. People should always use backups. Regularly update them and keep them on at least two separate locations, like the cloud, removable offline storage, and so on.
Aieou virus removal it's just the first step to getting your system back on track. Viruses corrupt system files, to restore whatever damage the cryptoworm has caused, use tool. It will automatically detect any altercations made to the system and revert them.
Cybercriminals in the ransom note (README.txt) state:


From our report of Nov 2020 · not reviewed since
Ways cybercriminals are using to infect devices
Cybercriminals' job is to trick gullible people and to infect their computer systems.
There are many types of malware, created with different purposes, but one goal - getting paid. Perpetrators can steal user bank, social media, or other logins with Trojan horses , encrypt their sensitive data with ransomware, etc.
The internet is full of viruses hidden in various places. The most common ways malware is spread is via spam emails and file-sharing platforms, such as The Pirate Bay, BitTorrent, and so on. Cyberthieves can camouflage their creations as many different file types, .txt, .exe, .pdf, to name just a few.
Always keep an eye on what you're clicking on in the email. Viruses might be hiding in mischievous hyperlinks or infected attachments. Malware on torrent sites is usually disguised as "crack" (illegal activation tool) files, game cheat codes, illegal software installers, or updaters. If possible, try to steer away from such sites and use only genuine apps downloaded from official developer websites.
From our report of Nov 2020 · not reviewed since
Guidelines for Aieou virus removal and device tune-up
Users should always keep a trustworthy anti-malware software to stand between him and the internet.
If you were unlucky and got your computer infected, we advise using or to automatically detect and remove Aieou virus and protect your device in the future.
Aieou ransomware removal won't decrypt your files. Always keep backups! In case of a cyberattack, instead of dealing with the criminals, you'd have to remove the virus, restore your system files, and recover your data from the backups.
Malware like the .aieou virus has been known to do extensive damage to computer system files without encrypting them. This might lead to your computer showing signs of abnormal behavior, such as crashing, lag, and so on. Use a powerful tool to get your system back on track and enjoy it as good as new.
[GI=method-1]Enter Safe Mode with Networking if you are unable to boot your anti-malware in normal mode:
[GI=method-2]System Restore might be useful when trying to real with ransomware:
Data recovery tools can not decrypt your files (only cybercriminals have the key) but it might be able to find some working copies of data within your hard drive.
Windows Previous Versions method
For this to work, it requires for a virus fail to delete automatic Windows restore points.
ShadowExplorer solution might be just for you
This method might be useful if malware filed to delete Shadow Copies from the system.
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.
Backups: the 3-2-1 rule
Keep three copies of files that matter, on two kinds of storage, with one copy offline or off-site.
A disk that stays plugged in is reached by malware like Aieou virus, Aieou malware, .aieou ransomware together with the PC; one you connect only for the backup is not.
On Windows 11, File History keeps versions on an external drive, and OneDrive keeps earlier versions of synced files. Before restoring anything, make sure the PC no longer shows files that end in .aieou and no longer open.
Setting it up step by step: 3-2-1 backups on Windows 11 and 10.
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 Aieou virus, Aieou malware, .aieou ransomware
How do I open .aieou files?
You cannot open them by renaming or by choosing another program. The .aieou ending shows that Aieou virus, Aieou malware, .aieou 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 Aieou virus, Aieou malware, .aieou ransomware. Store the encrypted files on an external disk until then.
Did Aieou virus, Aieou malware, .aieou ransomware steal my files or passwords?
We do not know yet. Nothing published so far shows data theft by Aieou virus, Aieou malware, .aieou ransomware, but the only confirmed sign is files that end in .aieou 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.
Is there a free Aieou virus, Aieou malware, .aieou ransomware decryptor?
We last checked on 6 October 2026, and for Aieou virus, Aieou malware, .aieou ransomware 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 "Aieou virus, Aieou malware, .aieou ransomware 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.
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.
How did Aieou virus, Aieou malware, .aieou ransomware get on my computer?
The way Aieou virus, Aieou malware, .aieou 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 .aieou 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 Aieou virus, Aieou malware, .aieou 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.
Can I just remove .aieou from the file names?
You can try it on a copy, but for real ransomware it will not help. The .aieou 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.
Can I delete README.txt?
Yes, the note itself is harmless text and deleting it does not affect your files. Keep at least one copy first, outside the infected PC. README.txt contains your personal ID and the attackers' contact details, which identification services use to tell which family encrypted your files, and which a decryptor may need later.
Police reports also ask for it. Once you have saved a copy, you can remove the notes from every folder after the ransomware program has been removed and your files are restored or backed up.
Will Fortect remove Aieou virus, Aieou malware, .aieou 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 Aieou virus, Aieou malware, .aieou 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
- VirusTotal: Detection Rate (read October 6, 2026)
- CSO Online: Ransomware explained: How it works and how to remove it (read October 6, 2026)
- Wikipedia: Trojan horse (read October 6, 2026)
- CISA: StopRansomware (read October 6, 2026)
- No More Ransom (read October 6, 2026)