Cerber v4.0 ransomware virus: what it is and how to remove it
Cerber 4.0 virus (also known as Cerber v4.0) has just joined the RaaS (ransomware-as-a-service) community in the middle of October 2016. Along with Janus Cybercrime (a combination of Mischa and Petya viruses) and Stampado, this new version of the Cerber virus family can currently be found on the dark web, waiting for the new partners in crime.
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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Cerber v4.0 ransomware 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 | .cerber3 |
| 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 | Cerber v4.0 ransomware virus |
| Type | File-encrypting ransomware |
| Symptoms | Files renamed with a new extension |
| Evidence | One write-up by a security site; details still limited |
| Encrypted files | .cerber3 |
| Free decryptor | No free decryptor is known (checked 6 October 2026) |
| First seen | 17 October 2016 |
| Facts checked | 6 October 2026 |
What to search your PC and browser for
- File extension:
.cerber3
How Cerber v4.0 ransomware virus behaves
From our report of Oct 2016 · not reviewed since
Cerber 4.0 virus. What's new?
Cerber 4.0 virus (also known as Cerber v4.0) has just joined the RaaS (ransomware-as-a-service) community in the middle of October 2016.
Along with Janus Cybercrime (a combination of Mischa and Petya viruses) and Stampado, this new version of the Cerber virus family can currently be found on the dark web, waiting for the new partners in crime.
If you haven't heard about ransomware-as-a-service strategy before, you should know that it is a raising trend among the malware creators, allowing them to earn even more illegal profit by turning their malicious creations into an affiliate business.
The most common model that the ransomware developers employ guarantee them at least 20 % of the revenue collected by the software distributors. Currently, Cerber v4.0 malware distribution seems to originate from three main malvertising campaigns:
Such vast spread of the ransomware is surely concerning and should encourage all of us to check whether our important personal data is really safe. Sure, you can simply carry out the Cerber 4 removal with reputable antivirus software such as and your computer will be as good as new, but the same can't be done with the files.
The complex encryption algorithm this virus has been using in Cerber 2.0 and Cerber 3.0 still remains uncrackable, and the only way to protect your data is by keeping data backups.
It is also important to note that though the previous virus versions have manifested minor changes, this new variant has been improved quite significantly. The virus creators claim that the program is now better at bypassing any activity monitoring and anti-malware programs, also, it features an updated encryption algorithm which adds random file extensions instead of the previously used .CERBER3.
Plus, even more files types have been added to the target list. Even if it might now be more difficult to detect and remove Cerber v4.0 ransomware from the infected device, it is completely necessary for the sake of the computer's health and safety of the future files.
- First and the most major of the three is Magnitude. This exploit kit has been spreading Cerber from the very beginning and continues to do so with the latest virus version as well. The exploit kit seems to have been developed by the Magnitude hackers specifically for spreading this virus around.
- The second group of hackers that jumped in for the distribution of this ransomware goes by the name of PseudoDarkleech. Unlike Magnitude, these cyber criminals are dedicated to other ransomware viruses as well, such as CrypMIC and CryptXXX. However, they have adjusted some things for Cerber 4.0 and, instead of using the Neutrino exploit kit, are currently using RIG to sneak the virus on the computer.
- Although PseudoDarkleech stopped using Neutrino, this exploit kit is still active and continues to assist ransomware in finding its way to the victims' computers.
From our report of Oct 2016 · not reviewed since
What defense strategies can help avoid this ransomware?
Before we jump to the Cerber v4.0 prevention strategies, we should first introduce two main channels through which it usually travels: malicious spam campaigns and malvertising.
Spam has always been a popular technique to deliver potentially dangerous software or malicious links straight to the users' computers. Spam campaigns were at their peak in 2010 and were steadily decreasing since, but in 2016, they have dramatically spiked once again.
Can it be related to an increase of ransomware popularity? It is highly probable. Sending ransomware by email has been proven an effective technique, so there is no reason for the malware creators not to use it for their own purposes.
Thus, you have to learn how to recognize potentially infected emails and avoid opening them. Usually, such emails will come from unknown senders and urge you to download the added attachments. Be very careful about opening emails received from governmental institutions because the hackers may be working under their name.
Malvertising is another technique which is actively exploited by ransomware developers. Malicious ads, fake software update pop-ups, lottery winnings are just a small part of the fraudulent online content which can be used to distribute Cerber v4.0 malware throughout the web. The users who give in to the temptation and click such offers simply allow the malware to install on their computers.
So how do you know what ads may be dangerous and which ones are safe to interact with? In reality, it is very tricky to distinguish the two, so the only way you can diminish the risk of stumbling on an infectious ad is by regularly scanning your PC for potential adware infections and avoiding unfamiliar domains.
How to remove Cerber v4.0 ransomware 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 Cerber v4.0 ransomware 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
Cerber v4.0 ransomware 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 Cerber v4.0 ransomware 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 Cerber v4.0 ransomware 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 Oct 2016 · not reviewed since
Important things to know about Cerber v4.0 removal
If you already on this part of the article, you are most likely looking for Cerber v4.0 virus elimination tips.
Having in mind the seriousness of this virus, you should not waste your time and proceed with the removal immediately. Since the latest version of Cerber has been especially improved in the area of antivirus defense, your virus-fighting utility may have trouble detecting and eliminating it.
So, before Cerber v4.0 removal, we suggest going through the instructions provided at the end of this article. When you are done with the virus decontamination, you should then initiate the full system scan again and remove Cerber v4.0 for good.
Cerber v4.0 leaves no chance in recovering your data after the encryption is done. However, there might be some alternative ways of retrieving your data without having to use the Cerber Decrypted that the cyber criminals offer. Below discuss three methods that may help you get at least some of your personal documents back.
For this method to work, the virus must already be contaminated in order to avoid the recurrence of the encryption.
How can Windows Previous Versions feature be put to use in recovering data?
Windows Previous Versions feature can be used to retrieve individual files. However, the previously enabled System Restore function is a must for this method to be successful. If that is already sorted, the following steps are presented below:
What are the benefits of using ShadowExplorer for the data recovery?
You can only benefit from ShadowExplorer if the Volume Shadow Copies of your files are still on the computer. If the ransomware has deleted them -- unfortunately, there is no chance of data recovery. Cerber v4.0 probably makes sure your system is cleared up from any backup copies but you can still try out running ShadowExplorer following the steps below.
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 .cerber3 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 Cerber v4.0 ransomware virus
How do I open .cerber3 files?
You cannot open them by renaming or by choosing another program. The .cerber3 ending shows that Cerber v4.0 ransomware 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 Cerber v4.0 ransomware virus. Store the encrypted files on an external disk until then.
When will a decryptor for Cerber v4.0 ransomware 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 Cerber v4.0 ransomware virus family. A decryptor may need an original file, so keep any unencrypted copies too.
Should I pay the ransom?
We advise against it, and so do the FBI, Europol and national cyber agencies. Payment does not guarantee a working tool: some attackers never reply, some tools damage files, and some variants have no decryptor at all. Paying also funds further attacks and can make you a target again.
Before considering payment, try every recovery option in this guide and report the attack. Companies must involve their legal adviser and insurer, because payments to sanctioned groups can be illegal. If files are truly irreplaceable, store the encrypted copies and wait; decryptors sometimes appear later.
Can a data-recovery company decrypt my files for a fee?
Only if a decryptor already exists or the company pays the attackers for you. Some "ransomware recovery" services advertise that they can decrypt families with no known flaw; in practice they negotiate with the attackers and add their own fee. Others use the same free tools listed on No More Ransom.
Before you hire anyone, ask in writing how they will recover the files, whether they will contact the attackers and what happens if they fail. A legitimate service answers clearly. If a free decryptor exists for your family, you can run it yourself.
How did Cerber v4.0 ransomware virus get on my computer?
The way Cerber v4.0 ransomware 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 .cerber3 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.
Did Cerber v4.0 ransomware virus steal my files or passwords?
We do not know yet. Nothing published so far shows data theft by Cerber v4.0 ransomware virus, but the only confirmed sign is files that end in .cerber3 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 Cerber v4.0 ransomware 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 .cerber3 from the file names?
You can try it on a copy, but for real ransomware it will not help. The .cerber3 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.
Will .cerber3 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 .cerber3. 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 Cerber v4.0 ransomware 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 Cerber v4.0 ransomware 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
- 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)
- Microsoft Learn: Microsoft Defender Offline (read October 6, 2026)
- Microsoft Learn: How Microsoft names malware (read October 6, 2026)