Heroset ransomware: what it is and how to remove it

Heroset ransomware is the cryptovirus that encodes victims' files with the specific algorithm (usually, RSA or AES) to demand the ransom. This cyber threat is not a harmless one and its effect on the target computer is noticed right after the infiltration.

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.

Automatic

Get a free scan and check if your PC is infected.

Fortect finds malware, unwanted programs and the Windows damage they leave behind, and repairs it in one pass.

Make sure nothing will rename more files to .heroset: an automatic scan checks the PC first.

Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free.

Do it yourself · free Remove Heroset ransomware yourself 6 steps, about 18 minutes, no software needed.

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Screenshot of Heroset ransomware: virus
Heroset ransomware as our 2019 report showed it.

Heroset ransomware: summary

DistributionSpam email campaigns,[1] infected files, software cracks
NameHeroset ransomware
TypeCryptovirus
FamilySTOP virus
File appendix.heroset
Ransom note_readme.txt
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 13 more facts
Contact emailsstoneland@firemail.cc, gorentos@bitmessage.ch
Decryption?Possible with https://twitter.com/demonslay335/status/1137440550364340224 updated by Michael Gillespie
Detection namesNo Microsoft detection name is known
Encrypted file extension.heroset
DecryptorNo free decryptor is known for this variant; check No More Ransom (nomoreransom.org) for updates
DamageNot recorded in the old report
SymptomsFiles renamed with a new extension and a ransom note left in folders
Evidence4 write-ups by security sites; no sample analysed yet
Encrypted files.heroset
Attacker contactsstoneland@firemail.cc
Free decryptorNo free decryptor is known (checked 6 October 2026)
First seen17 June 2019
Facts checked6 October 2026
  • File extension: .heroset
  • Note file: _readme.txt
  • Contact: stoneland@firemail.cc

From our report of Jun 2019 · not reviewed since

More from our earlier report on Heroset ransomware

  • Use anti-malware for Heroset ransomware removal and remove virus damage with

How Heroset ransomware behaves

From our report of Jun 2019 · not reviewed since

Heroset ransomware is the Djvu virus version that gives less than 72 hours to pay the ransom to its developers

Heroset ransomware is the cryptovirus that encodes victims' files with the specific algorithm (usually, RSA or AES) to demand the ransom.

This cyber threat is not a harmless one and its effect on the target computer is noticed right after the infiltration.

After adding .heroset file extension to the encrypted data, the virus asks for its victim to contact its developers in less than 72 hours to know how much do they need to pay as a ransom. Since this is a version of Djvu ransomware, we don't recommend relying on these people.

The Heroset ransomware virus is one of many similar versions in the family, so developers can release another version in a matter of days as it was previously done. Fortunately, you can react as soon as possible and remove this malware from the machine.

Then, your files can be restored with backups or the updated STOP virus decrypter. However, you need to clean the machine fully before any file restoring to ensure that your data is not damaged in the process.

Heroset ransomware starts the infiltration with a system scan to make sure that the machine is not encrypted already. Also such malware targets particular places, so it checks the location of the device and finds files for encoding process which is the main goal of the attack. When data gets encrypted, virus developers can demand payment.

The main ransom message displayed by Heroset comes to the computer once all selected files get encrypted and marked with .heroset file appendix. _readme.txt reveals more details about the ransomware attack, encryption and offers to contact developers via stoneland@firemail.cc, gorentos@bitmessage.ch in 72 hours or less to get the alleged 50% discount.

However, you shouldn't trust these people since paying 980$ or the reduced amount of 490$ can lead to money loss but not the data recovery. The ransom note that Heroset ransomware delivers is not unique, it matches with other versions in the same virus family and reads the following:

Heroset ransomware focuses on file locking because when peoples' data becomes useless they get more likely to meet the demand. Such threats affect documents, photos, video and audio files by changing the original code and making the file unreachable. Then the only solution is either decryption or file recovery.

When data becomes useless, the victim tends to believe people behind the threat and pay the amount demanded. Since this is a cyber threat, the ransom needs to be paid in cryptocurrency, this time - Bitcoin. The process of converting the currency may be difficult, so virus creators have brief instructions on the payment itself in the ransom message.

However, we cannot stress this enough that you shouldn't consider paying the ransom when even big companies restrain from that. You better get rid of Heroset ransomware and clean the machine because cryptovirus can cause more than damage to your data.

The researcher who reported about this particular version in the cryptovirus family also develops a decryption tool for files affected in the ransomware attack, so keep an eye for the update and clean the machine, instead of contacting cybercriminals because it can lead to more issues.

Screenshot of Heroset ransomware: virus
Heroset ransomware in our 2019 report.
Heroset ransomware: heroset file locking virus
Heroset ransomware in our 2019 report.

From our report of Jun 2019 · not reviewed since

Numerous activities initiated by Heroset virus

Additionally to all the file-locking process, Heroset ransomware can:

Because of all these activities, Heroset ransomware removal requires professional tools that could scan the system fully and remove applications, files, and viruses from hidden places. You should also consider and other system tools to make sure that virus damage is fixed and terminated.

Heroset files virus can affect your antivirus tool, security system functions or disable various programs to keep the virus activity persistent. You can find other tips below the article.

Remove Heroset ransomware as soon as possible as various experts recommends and then check for additional applications by scanning the PC. When your computer is virus-free, you can rely on your data backups and restore files or employ software designed for that.

  • copy, delete or steal data stored on the machine;
  • gather information about the system or network;
  • get access to parts of the device with administrative rights;
  • create registry entries or alter existing ones;
  • install other files or applications;
  • perform other processes in the background.
Screenshot of Heroset ransomware: screenshot
Heroset ransomware in our 2019 report.

From our report of Jun 2019 · not reviewed since

Cryptocurrency-extortion based threats come via infected files hidden on spam emails

Since cryptovirus is a more sophisticated threat than any unwanted browser application the distribution techniques involve more serious phishing attacks and social engineering instead of deceptive advertising.

The main technique used to spread file-locking malware is spam emails.

When malicious actors compose their email spam campaigns they rely on known service or company names that allow hiding their maliciously infected files on the email as a file attachment. Once such data gets downloaded on the machine and opened by the victim malicious macros deliver the payload or direct malware on the PC.

You can avoid such cyber infections by paying closer attention to every received email and deleting any suspicious notifications. Remember that companies are not disclosing financial information to random people and when you are not familiar with the company - the mail may be infected. Clean the email box more often.

The Heroset ransomware note

a ransom note left in folders

ATTENTION!

Don't worry, you can return all your files!

All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.

The only method of recovering files is to purchase decrypt tool and unique key for you.

This software will decrypt all your encrypted files.

What guarantees you have?

You can send one of your encrypted file from your PC and we decrypt it for free.

But we can decrypt only 1 file for free. File must not contain valuable information.

You can get and look video overview decrypt tool:

https://we.tl/t-7AKxZTQTdy

Price of private key and decrypt software is $980.

Discount 50% available if you contact us first 72 hours, that's price for you is $490.

Please note that you'll never restore your data without payment.

Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours.

To get this software you need write on our e-mail:

gorentos@bitmessage.ch

Reserve e-mail address to contact us:

stoneland@firemail.cc

Our Telegram account:

@datarestore

Your personal ID:

How to remove Heroset 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 Heroset 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.

  1. 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 Heroset 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 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 confirm the family

    Your files now end in .heroset and the instructions are in _readme.txt. 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.

    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

    Our last check found that for Heroset ransomware, no free decryptor is known (checked 6 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

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

    Removing Heroset 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 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

    Windows keeps shadow copies for restore points and backups, and some ransomware fails to delete them. vssadmin list shadows in 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.

    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

    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 Heroset 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

  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 Jun 2019 · not reviewed since

The proper Heroset ransomware removal requires a full system scan to delete all associated data and applications

We already noted how many changes Heroset ransomware virus can make on the machine by disabling certain functions or adding and deleting files or programs.

You cannot notice the damage since these alterations happen in the registry, system folders.

For this reason, we can recommend Heroset ransomware removal process with automatic anti-malware tools that can find all issues on the machine, malicious files, the main malware and programs added for questionable purposes. A thorough system check indicates all those issues after a few minute scan.

Then you can remove Heroset ransomware and get back to the cleaner and improved device. Rely on , , or and check the computer for all the malware traces.

[GI=method-1]Reboot your device in Safe Mode with Networking and then remove Heroset ransomware with, or anti-malware tool

[GI=method-2]Use System Restore to recover the machine in a previous version

Windows Previous Versions is the feature helpful for encoded data

If System restore was enabled, Windows Previous Versions can help recover the useless files

ShadowExlorer - a method for file recovery

When Shadow Volume Copies are not affected by the virus, you can restore files with ShadowExplorer

STOP decrypter can fork for Heroset ransomware affected files

Decryption is possible with STOP decrypter updated by Michael Gillespie

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.

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 Heroset 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 .heroset and no longer open.

Setting it up step by step: 3-2-1 backups on Windows 11 and 10.

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 Heroset ransomware

How do I open .heroset files?

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

Did Heroset ransomware steal my files or passwords?

We do not know yet. Nothing published so far shows data theft by Heroset ransomware, but the only confirmed sign is files that end in .heroset 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 there a free Heroset ransomware decryptor?

We last checked on 6 October 2026, and for Heroset 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 "Heroset 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.

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 Heroset ransomware get on my computer?

The way Heroset 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 .heroset 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 Heroset 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 .heroset from the file names?

You can try it on a copy, but for real ransomware it will not help. The .heroset 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.

What does _readme.txt tell me about the ransomware?

Quite a lot. The file name _readme.txt, 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.

Will Fortect remove Heroset 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 Heroset 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

More removal guides

Questions and experiences: Heroset ransomware

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