Smrss32 ransomware virus: what it is and how to remove it

Smrss32 ransomware virus is a malicious cyber threat which was named after its executable file smrss32.exe. According to PC security experts, it is similar to Bucbi, Apocalypse, and Troldesh virus that all share the same distribution technique which relies on unsecured RDP connections.

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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Smrss32 ransomware virus: 1
Smrss32 ransomware virus as our 2016 report showed it.

Smrss32 ransomware virus: summary

Detection namesNo Microsoft detection name is known
Ransom noteNot recorded in our earlier report
ContactNot recorded in our earlier report
Encrypted file extension.encrypted
DecryptorNo free decryptor is known for this variant; check No More Ransom (nomoreransom.org) for updates
DistributionNot 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
DamageNot recorded in the old report
NameSmrss32 ransomware virus
TypeFile-encrypting ransomware
SymptomsFiles renamed with a new extension
EvidenceOne write-up by a security site; details still limited
Encrypted files.encrypted
Free decryptorNo free decryptor is known (checked 6 October 2026)
First seen12 August 2016
Facts checked6 October 2026
  • File extension: .encrypted

From our report of Aug 2016 · not reviewed since

More from our earlier report on Smrss32 ransomware virus

  • .18113 .3gp2 .8pbs .acs2 .aifc .aiff .amff .ascx .aspx .azw3 .backup .backupdb .bank .blob .book .bsdl .cache .cals .cctor .cdr3 .cdr4 .cdr5 .cdr6 .class .clipflair .config .crtr .crtx .ctuxa .data .dazip .ddoc .desc .djvu .dmsk .docm .docx .dotx .dsp2 .dump .encrypted .exif .fh10 .flac .fmpp .gray .grey .gtif .gzip .h264 .hkdb .hplg .html .hvpl .ibank .icns .icxs .ilbm .im30 .incpas .indd .indt .ipsw .itc2 .itdb .ithmb .iw44 .java .jfif .jhtml .jnlp .jpeg .json .kdbx .kext .keychain .keychain .kpdx .lang .latex .lay6 .layout .ldif .litemod .log1 .log2 .log3 .log4 .log5 .log6 .log7 .log8 .log9 .m2ts .m3url .macp .maff .mcmeta .mdbackup .mddata .mdmp .mp2v .mpeg .mpga .mpls .mpnt .mpqge .mpv2 .mrwref .ms11 .mspx .mswmm .oeaccount .opus .otpsc .pack .pages .paint .phtml .pict .pj64 .pkpass .pntg .potm .potx .ppam .ppsm .ppsx .pptm .pptx .ppxps .psafe3 .psmdoc .pspimage .rels .rgss3a .rmvb .rofl .rppm .rtsp .s3db .sas7bcat .sas7bdat .sas7bndx .sas7bpgm .sas7bvew .sidd .sidn .sitx .skin .sldm .sldx .smil .targa .temp .test .text .tiff .tmpl .torrent .trace .tt10 .uns2 .urls .user .vcmf .vfs0 .view .vmdk .wallet .wbmp .webm .webp .wlmp .wotreplay .wrml .xbel .xfdl .xhtml .xlam .xlsb .xlsm .xlsx .xltm .xltx .xspf .xvid .ycbcra .zipx .ztmp

How Smrss32 ransomware virus behaves

From our report of Aug 2016 · not reviewed since

What problems can Smrss32 ransomware cause on my computer?

Smrss32 ransomware virus is a malicious cyber threat which was named after its executable file smrss32.exe.

According to PC security experts, it is similar to Bucbi, Apocalypse, and Troldesh virus that all share the same distribution technique which relies on unsecured RDP connections. Once this threat is installed, it modifies the system and encrypts victim's files with the help of AES symmetric encryption. The most surprising fact related to this virus is that it targets more than 6K file extensions.

Keeping in mind that previously released ransomware viruses have only been trying to encrypt from 50 to 500 types of files, this ransomware can cause lots of trouble. However, the most of extensions in Smrss32 virus target list are duplicated, for example .PNG and .png, what makes security experts to believe that the developer of this ransomware is not an experienced one. The list of targeted extensions includes:

If infected with this ransomware, you will see that each of your files has .encrypted file extension added to them. Also, you should see a ransom note asking you to pay 1 Bitcoin (which is equal to $590) in exchange for the decryption key. It is known that 15 victims have already paid the ransom while trying to unlock their files.

However, there is no guarantee that they have received a unique decryption key needed to unlock blocked files. Keep in mind that you have with hackers who are trying to make the money, so there is no guarantee that you will receive a genuine decryption key.

Besides, the ransom note used by Smrss32 claims that the victim is dealing with "CryptoWall software." It is a well-known ransomware which, at the moment of writing, is not as active as it was several months ago.

Most probably, it has nothing to do with the developers of CryptoWall and requires using a different strategy for Smrss32 removal. The most reliable one involves downloading , updating it and running a full system scan. To recover your files, you can restore them from backup or use a special software given at the end of this post.

Smrss32 ransomware virus: 1
Smrss32 ransomware virus in our 2016 report.

From our report of Aug 2016 · not reviewed since

How does this virus typically infiltrate computers?

Smrss32 ransomware is different from other viruses of the category because it uses a slightly different technique to infiltrate computers.

Although it still can arrive into your inbox as a spam email or install as a deceptive software update (like the majority of ransomware infections do), a more common method hackers use to spread Smrss32 around is manual installation. The malware creators exploit unprotected Remote Desktop Protocol (RDP) connections to gain access to the computer and install this virus on the computer undetected.

This is a rather strange method of spreading ransomware around since its distribution volume is very limited, and the successful installation rate is much lower as well. Nevertheless, that did not seem to have stopped the hackers from infiltrating over 15 computers already. Thus, precautions must be taken to avoid it.

We suggest equipping your system with a powerful firewall capable of terminating unauthorized connections as well as enable real-time protection on your antivirus utility to block other channels of infiltration. To remove Smrss32 ransom note from your desktop and recover connection to your data, use a following guide.

How to remove Smrss32 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 Smrss32 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.

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

    Smrss32 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 quick settings with Wi-Fi turned off
    Windows 11: turn off Wi-Fi to take the PC offline.

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

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

    Find the ransom note, usually a .txt, .html or .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.

    A ransom note text file next to encrypted files in File Explorer
    Windows 11: the ransom note and encrypted files to copy for identification.

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

  3. Step 3: Check for a free decryptor

    For Smrss32 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

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

    Restoring or decrypting files while Smrss32 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 Security Scan options with Microsoft Defender Antivirus offline scan selected
    Windows 11: Windows Security > Virus & threat protection > Scan options.

    Full procedure with screenshots: Run a Microsoft Defender Offline scan

  5. Step 5: Look for shadow copies of the files

    Open Command Prompt as administrator and run vssadmin list shadows. If it lists copies dated before the attack, right-click a folder with encrypted files in File Explorer, choose Properties > Previous Versions, and open or restore a version from before that date.

    ShadowExplorer, a free tool, shows the same copies when the tab is empty or hidden. Most current families delete shadow copies, so an empty list is normal, but the check takes two minutes on Windows 11 or Windows 10.

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

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

  6. Step 6: Restore the files from a backup or recover deleted originals

    Restore from an external backup, File History or OneDrive's version history, choosing a date before the attack. Connect the backup drive only after the scans are clean, or the ransomware encrypts it too.

    If there is no backup, file recovery software can sometimes find the deleted originals, because some ransomware writes an encrypted copy and deletes the original file.

    Stop writing to the drive and try recovery on Windows 11 or Windows 10 before new files overwrite the space.

    Full procedure with screenshots: Recover deleted files (Recycle Bin, backups, OneDrive) On uGetFix

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

  1. Click Start > Shutdown > Restart > OK.
  2. 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.
  3. Select Safe Mode with Networking from the list.Windows 7/XP

Windows 10 / Windows 8

  1. Right-click on Start button and select Settings.
    Settings
  2. Scroll down to pick Update & Security.
    Update and security
  3. On the left side of the window, pick Recovery.
  4. Now scroll down to find Advanced Startup section.
  5. Click Restart now.
    Reboot
  6. Select Troubleshoot.Choose an option
  7. Go to Advanced options.Advanced options
  8. Select Startup Settings.Startup settings
  9. Press Restart.
  10. Now press 5 or click 5) Enable Safe Mode with Networking.Enable safe mode

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:

  1. Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
  2. Click on More details.
    Open task manager
  3. Scroll down to Background processes section, and look for anything suspicious.
  4. Right-click and select Open file location.
    Open file location
  5. Go back to the process, right-click and pick End Task.
    End task
  6. Delete the contents of the malicious folder.

Step 3. Check program Startup

  1. Press Ctrl + Shift + Esc on your keyboard to open Windows Task Manager.
  2. Go to Startup tab.
  3. Right-click on the suspicious program and pick Disable.
    Startup

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:

  1. Type in Disk Cleanup in Windows search and press Enter.
    Disk cleanup
  2. 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).
  3. Scroll through the Files to delete list and select the following: Temporary Internet Files
    Downloads
    Recycle Bin
    Temporary files
  4. Pick Clean up system files.
    Delete temp files
  5. 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 Aug 2016 · not reviewed since

Smrss32 removal

If you can see .encrypted file extension added to your files, there is a huge chance that you are infected.

Fortunately, anti-spyware developers are working hard to help people with the removal of such ransomware-type threats, so you can already remove Smrss32 virus with the help of or . Make sure you use the latest versions of these programs to get the best result.

If you can see that this ransomware is blocking the scanner and making it useless, you should follow a detailed guide given below to unblock your anti-spyware. For that, you just need to follow these steps:

  • Install the program by following its installation wizard;
  • Restore them.

Report it and recover your files

Report it

Report the attack even if you do not expect the files back: insurers and banks ask for the report number, and police use the contacts in the note to link cases.

United States
FBI IC3 · FTC ReportFraud

Give the victim ID, the note and the date the files were encrypted. A business that holds personal data may also have to notify its data protection authority, in the EU within 72 hours.

Protect the files you restore

Restore only after the scans are clean and the PC no longer shows files that end in .encrypted 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.

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 Smrss32 ransomware virus

Is there a decryptor for .encrypted files?

That depends on the family behind the .encrypted 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 .encrypted files?

You cannot open them by renaming or by choosing another program. The .encrypted ending shows that Smrss32 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 Smrss32 ransomware virus. Store the encrypted files on an external disk until then.

How did Smrss32 ransomware virus get on my computer?

The way Smrss32 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 .encrypted 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.

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.

Did Smrss32 ransomware virus steal my files or passwords?

We do not know yet. Nothing published so far shows data theft by Smrss32 ransomware virus, but the only confirmed sign is files that end in .encrypted 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 Smrss32 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.

Will .encrypted 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 .encrypted. 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.

If I delete Smrss32 ransomware virus, do my files come back?

Unfortunately not. Deleting the program only ends the attack; every file that already has the .encrypted ending stays encrypted, because decryption needs a key that only the attackers hold.

That is why this guide separates removal from recovery. First make sure Smrss32 ransomware virus is gone with an offline scan, then work through the recovery list:

  • backups
  • OneDrive history
  • Previous Versions
  • copies on other devices and
  • if one exists
  • a decryptor

Do not rename or edit the encrypted files in the meantime, and keep them even if nothing works today.

Will Fortect remove Smrss32 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 Smrss32 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

  1. CISA: StopRansomware (read October 6, 2026)
  2. No More Ransom (read October 6, 2026)
  3. FTC: How to recognize, remove and avoid malware (read October 6, 2026)
  4. Microsoft Learn: Microsoft Defender Offline (read October 6, 2026)
  5. Microsoft Learn: How Microsoft names malware (read October 6, 2026)

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