Russenger ransomware: what it is and how to remove it
Russenger virus is malicious ransomware-type malware, which has been discovered at the end of February 2018. The name of the virus it seems to be a combination of "Russian" and "Messenger," since it has "Messenger" all over the executable, but later on, experts found out that the hackers borrowed a popular German surname Russenger.
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.
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Russenger ransomware: summary
| Detection names | No Microsoft detection name is known |
|---|---|
| Ransom note | A message left on the computer; the text is quoted in full below |
| Contact | messenger@riseup.net |
| Encrypted file extension | .messenger |
| 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 | Russenger ransomware |
| Type | File-encrypting ransomware |
| Symptoms | Files renamed with a new extension and a ransom note left in folders |
| Evidence | 5 write-ups by security sites; no sample analysed yet |
| Encrypted files | .messenger |
| Free decryptor | No free decryptor is known (checked 7 October 2026) |
| First seen | 20 February 2018 |
| Facts checked | 7 October 2026 |
Traces of Russenger ransomware you can check
- File extension:
.messenger - Note file:
the ransom note
How Russenger ransomware behaves
From our report of Feb 2018 · not reviewed since
Russenger – crypto-malware oriented to English speaking users
Russenger virus is malicious ransomware-type malware, which has been discovered at the end of February 2018.
The name of the virus it seems to be a combination of "Russian" and "Messenger," since it has "Messenger" all over the executable, but later on, experts found out that the hackers borrowed a popular German surname Russenger.
The virus spreads via spam, unprotected RDP configuration, malicious ads, infected software downloads, fake updates, and similar techniques. After successful infiltration, Russenger ransomware encrypts most of the files stored on the system and appends the .messenger-% random% file extension to each of them. The second part of the extension differs for each locked file.
After the successful encryption, the computer user receives a ransom note Инструкция по дешифровке.txt. The .txt file contains a text message that instructs the victim how to pay the ransom for the unique Russenger decryptor.
Extortionists insist the victim contact them via messenger@riseup.net or mail.ru, yandex.ru in case the first email does not respond. It's not clear yet what form and amount of ransom criminals demand, but experts consider it to be Bitcoin-related ransomware.
Although Russenger ransomware virus is focused on English-speaking users, the origin of its developer is Russia. The ransom note and other information that the ransomware provides is a direct translation from the Russian language, which is why it contains many grammar mistakes. Besides, one of the main files related to this crypto-malware is 1cv8s32-n.exe. It's an imitation of the Russian accounting software 1C.
The ransomware cannot be decrypted for free. The only way to decrypt files encrypted by Russenger ransomware is to pay the ransom for a unique decryption key. However, cybersecurity experts from NoVirus.co warn people about the danger of collaboration with cybercriminals. The latter may not even have a working decryption key, or they may not intend to send it to the victim even after the payment is transmitted.
Thus, there's no guarantee that you will get your files back. The only trustworthy way to deal with this pest is complete removal. To remove Russenger virus from your PC employ a reputable anti-virus, such as , or . Manual ransomware removal is not possible due to multiple malicious files that it injects into system's folders.
The bad news is that Russenger removal will swipe all encrypted files away. Nonetheless, you can try to decrypt the using alternative methods. You can find all decryption instructions at the end of this article.
From our report of Feb 2018 · not reviewed since
Opening spam email attachments poses the highest risk or ransomware infection
While in general there's a variety of ransomware distribution strategies that cybercriminals employ, spam email with infected attachments if the most widespread way to disseminate viruses.
Extortionists distribute genuine-looking email messages via Necurs botnet or other sources, which impersonate well-known companies or governmental institutions. Such email letters may contain a body text, but usually, it's not professionally written and may contain many grammar or type mistakes.
Such email messages will always contain a .doc, .docx, .pdf, .jpg, .png or similar attachment, which may be indicated as an official upgrade, notification or whatnot. More gullible people fall for this trick and open the attachment. Although in most of the cases opening attachments require enabling Macros, experts recently detected a wave of Macro-less spam attachments.
In addition to malspam campaigns, people should be careful with RDP configuration, suspicious downloads, and especially legitimate –looking software update offers provided on random websites while browsing on the Internet. Such updates may disguise ransomware executable, so instead of downloading a supposed update, you may enable ransomware.
The Russenger ransomware note
All your information on this computer has been encrypted.
Encrypted documents have .messenger extensions - ******
For instructions on deciphering, write an email to:
messenger@riseup.net
In the subject of the letter, specify your code for decoding:
***
If you get the answer that the mailing address does not exist:
1. Try to write to us from other emails, mail.ru, yandex.ru;
2. Try writing over time.
How to remove Russenger 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 Russenger 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
Unplug the network cable or turn off Wi-Fi, and disconnect USB drives, external disks and network shares, so Russenger ransomware cannot reach more files. Pause OneDrive, Google Drive or Dropbox sync, because synced folders upload the encrypted copies over the good ones.
Leave the PC on but offline while you read the next steps, since a restart can let the ransomware run again. This applies to Windows 11 and Windows 10 alike.
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
Your files now end in
.messengerand the instructions are inthe ransom note. Save both to a USB stick, a copy of the note and two small encrypted files, before anything else.On another device, check them with ID Ransomware or Crypto Sheriff: the family name decides which decryptor, if any, can help. Keep the note's ID and contact line for your report.
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
Our last check found that for Russenger ransomware, no free decryptor is known (checked 7 October 2026). Look again yourself in the No More Ransom list and the free decryptor pages of Emsisoft, Avast and Kaspersky, which add new families every year.
A decryptor needs the ransomware gone first, or it encrypts the files again. Keep at least one copy of the encrypted files on an external drive, even if no tool works yet.
Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 4: Remove the ransomware before you restore or decrypt
Removing Russenger ransomware does not bring the files back, but it has to come first. Start with Defender's Full scan, then the offline scan from the same Scan options page, which checks the disk before Windows loads.
If the scan cannot start, use Safe Mode with Networking. Delete the ransom notes only after you have saved a copy, because removal tools sometimes leave them behind on Windows 11 and 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
Windows keeps shadow copies for restore points and backups, and some ransomware fails to delete them.
vssadmin list shadowsin an administrator Command Prompt tells you at once whether any exist.If they do, right-click the folder that held your files, open Properties > Previous Versions, select a version from before the attack, and click Open to check it before you Restore or copy the files out. Windows 11 and Windows 10 both have the tab.
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
A backup made before the attack is the surest way back. Connect it only once the PC is clean, then restore from File History, Windows Backup, OneDrive's Restore your OneDrive or your own external copies.
Without a backup, try file recovery: the originals that Russenger ransomware deleted may still be on the disk until something overwrites them. Install nothing new on the drive you want to recover from on the Windows 11 or Windows 10 PC.
Full procedure with screenshots: Recover deleted files (Recycle Bin, backups, OneDrive) On uGetFix
Instructions for each browser and system
The detailed steps for every browser and system this guide covers. Open the one you use.
Manual removal using Safe Mode
Important! →
Manual removal guide might be too complicated for regular computer users. It requires advanced IT knowledge to be performed correctly (if vital system files are removed or damaged, it might result in full Windows compromise), and it also might take hours to complete. Therefore, we highly advise using the automatic method provided above instead.
Step 1. Access Safe Mode with Networking
Manual malware removal should be best performed in the Safe Mode environment.
Windows 7 / Vista / XP
- Click Start > Shutdown > Restart > OK.
- When your computer becomes active, start pressing F8 button (if that does not work, try F2, F12, Del, etc. - it all depends on your motherboard model) multiple times until you see the Advanced Boot Options window.
- Select Safe Mode with Networking from the list.
Windows 10 / Windows 8
- Right-click on Start button and select Settings.
- Scroll down to pick Update & Security.
- On the left side of the window, pick Recovery.
- Now scroll down to find Advanced Startup section.
- Click Restart now.
- Select Troubleshoot.
- Go to Advanced options.
- Select Startup Settings.
- Press Restart.
- Now press 5 or click 5) Enable Safe Mode with Networking.
Step 2. Shut down suspicious processes
Windows Task Manager is a useful tool that shows all the processes running in the background. If malware is running a process, you need to shut it down:
- Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
- Click on More details.
- Scroll down to Background processes section, and look for anything suspicious.
- Right-click and select Open file location.
- Go back to the process, right-click and pick End Task.
- Delete the contents of the malicious folder.
Step 3. Check program Startup
- Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
- Go to Startup tab.
- Right-click on the suspicious program and pick Disable.
Step 4. Delete virus files
Malware-related files can be found in various places within your computer. Here are instructions that could help you find them:
- Type in Disk Cleanup in Windows search and press Enter.
- Select the drive you want to clean (C: is your main drive by default and is likely to be the one that has malicious files in).
- Scroll through the Files to delete list and select the following:
Temporary Internet Files
Downloads
Recycle Bin
Temporary files - Pick Clean up system files.
- You can also look for other malicious files hidden in the following folders (type these entries in Windows Search and press Enter):
%AppData%
%LocalAppData%
%ProgramData%
%WinDir%
After you are finished, reboot the PC in normal mode.
From our report of Feb 2018 · not reviewed since
Find out how to eliminate Russenger file-encrypting virus
The fastest and the only reliable way to remove Russenger malware is to use powerful security software.
It will ensure the removal of all ransomware package and other malware that might have come along with it.
Manual Russenger removal is hardly possible even if you are an advanced computer user as you can leave some malicious files intact, which can proceed with file encryption. So all you have to do is to update your anti-virus and run a full system scan with it.
If Russenger virus blocks your anti-virus or prevents you from downloading one, you should reboot the system into Safe Mode with Networking. If nevertheless, you opt for manual removal, you can find a comprehensive guide down below:
[GI=method-1]If the virus block your anti-virus, reboot the system into Safe Mode with Networking and then run a full system scan with it:
[GI=method-2]You can get rid of Russenger ransomware by booting your PC into Safe Mode with Command Prompt function
Remember that Russenger removal does not decrypt your files. However, there's a couple of methods that can help you to get the most important files back.
Windows Previous Versions might recover the most valuable files
This feature will not help to decrypt all locked files. It will help to recover separate files only. However, it will work if you have previously enabled a System Restore function before ransomware infiltration.
Get help from ShadowExplorer
You can partially recover your data encrypted by .messenger-% random% file extension virus using the method below if the ransomware didn't delete Shadow Volume Copies from your system.
Russenger decryptor is not 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.
Make the next attack harmless
Russenger ransomware could only hurt the files that had no second copy, and the signs (files that end in .messenger 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.
Protect your privacy - employ a VPN
There are several ways how to make your online time more private - you can access an incognito tab.
However, there is no secret that even in this mode, you are tracked for advertising purposes. There is a way to add an extra layer of protection and create a completely anonymous web browsing practice with the help of VPN. This software reroutes traffic through different servers, thus leaving your IP address and geolocation in disguise.
Besides, it is based on a strict no-log policy, meaning that no data will be recorded, leaked, and available for both first and third parties. The combination of a secure web browser and VPN will let you browse the Internet without a feeling of being spied or targeted by criminals.
No backups? No problem. Use a data recovery tool
If you wonder how data loss can occur, you should not look any further for answers - human errors, malware attacks, hardware failures, power cuts, natural disasters, or even simple negligence.
In some cases, lost files are extremely important, and many straight out panic when such an unfortunate course of events happen. Due to this, you should always ensure that you prepare proper data backups on a regular basis.
If you were caught by surprise and did not have any backups to restore your files from, not everything is lost. is one of the leading file recovery solutions you can find on the market - it is likely to restore even lost emails or data located on an external device.
Questions about Russenger ransomware
Is there a decryptor for .messenger files?
That depends on the family behind the .messenger 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.
How do I open .messenger files?
You cannot open them by renaming or by choosing another program. The .messenger ending shows that Russenger 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 Russenger ransomware. Store the encrypted files on an external disk until then.
Did Russenger ransomware steal my files or passwords?
We do not know yet. Nothing published so far shows data theft by Russenger ransomware, but the only confirmed sign is files that end in .messenger 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.
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 Russenger ransomware get on my computer?
The way Russenger 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 .messenger 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 Russenger 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.
What does the ransom note tell me about the ransomware?
Quite a lot. The file name the ransom note, the wording, the contact addresses and the format of the personal ID are typical for each family. Uploading the note together with one encrypted file to ID Ransomware or No More Ransom's Crypto Sheriff usually names the family within seconds.
That name decides your options: some families have free decryptors, some can be partially recovered, and some cannot be decrypted at all. The note's claims about stolen data should be taken seriously but not at face value.
Should I reinstall Windows after the .messenger attack?
Reinstalling removes the ransomware but not the encryption: your files ending in .messenger stay encrypted afterwards. So first copy the encrypted files and the ransom note to a separate drive, in case a decryptor appears later. Then decide:
- a clean-up with an offline scan is often enough for home PCs
- while a full reset is safer if remote access was involved
- scans keep finding new items
Restore your backups only after the PC is clean, and change passwords from another device.
Will Fortect remove Russenger 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 Russenger 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
- UgetFix: Macro-less Microsoft Word spam attachments infect users with malware (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)