Mole66 ransomware: what it is and how to remove it

Mole66 is a crypto-malware that belongs to the CryptoMix ransomware family. It has been revealed at the end of March 2018 by a group of ransomware researchers and caused commotion due to active CryptoMix rebound.

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.

Automatic

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Screenshot of Mole66: crypromix ransomware
Mole66 as our 2018 report showed it.

Mole66 ransomware: summary

Distributionspam attachments, malvertising, exploit kits, fake software updates
NameMole66
FamilyCryptoMix
Danger levelHigh. Locks files and demands a ransom
DecryptableNo. Removes Volume Shadow Copies and Restore option. Practically impossible to unlock files
SymptomsFile names appended with .MOLE66 file extension. _HELP_INSTRUCTIONS_.TXT ransom note on the desktop
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 14 more facts
Related filesBC2D64A077.exe
Detection namesNo Microsoft detection name is known
Ransom note_HELP_INSTRUCTIONS_.TXT; the text is quoted in full below
Contactalpha2018a@aol.com
Encrypted file extension.mole66
DecryptorNo free decryptor is known for this variant; check No More Ransom (nomoreransom.org) for updates
DamageNot recorded in the old report
TypeFile-encrypting ransomware
Evidence4 write-ups by security sites; no sample analysed yet
Encrypted files.mole66
Attacker contactsalpha2018a@aol.com
Free decryptorNo free decryptor is known (checked 7 October 2026)
First seen30 March 2018
Facts checked7 October 2026

Traces of Mole66 you can check

  • File extension: .mole66
  • Note file: _HELP_INSTRUCTIONS_.TXT
  • Contact: alpha2018a@aol.com

How Mole66 ransomware behaves

From our report of Mar 2018 · not reviewed since

Mole66 is the latest version of CryptoMix ransomware

Mole66 is a crypto-malware that belongs to the CryptoMix ransomware family.

It has been revealed at the end of March 2018 by a group of ransomware researchers and caused commotion due to active CryptoMix rebound. The Mole66 Cryptomix ransomware targets the most popular files types and uses AES cipher to lock them. Upon encryption, personal data gets .MOLE66 file extension and the victim is presented with the _HELP_INSTRUCTIONS_.TXT ransom note.

Likewise, CryptoMix and most of its versions, Mole66 ransomware's payload is distributed via malicious scripts embedded into online ads, spam email attachments, fake software updates, and exploit kits. The virus is usually disguised under BC2D64A077.exe file, which once executed roots into the % AppData% \ BC2D64A077.exe location.

Mole66 Cryptomix ransomware variant exhibits a high danger level. Yes, it locks files and demands the victim to pay the ransom in Bitcoins within 72 hours. However, it stops the Volume Shadow Copy (VSS) Service and runs the following scrips via an elevated Command Prompt:

Consequently, Volume Shadow Copies are removed permanently without leaving the victim the option to retrieve files encrypted by .MOLE66 file extension using ShadowExplorer or another third-party recovery tool. Besides, MOLE66 CryptoMix ransomware disables Windows Recovery and Repair options.

One the changes are made, MOLE66 virus generates a _HELP_INSTRUCTIONS_.TXT note on the desktop, which provides the following information:

The victim is demanded to contact crooks via alpha2018a@aol.com email and indicate a unique ID to find out a redeem size, which is currently unknown. However, experts point out that it's yet another Bitcoin-related ransomware. The payment has to be transferred with 72 hours before permanent data removal.

The interesting fact is that the encryption is terminated if the ransomware scanner detects Russian locale. This fact implies a possible origin or close relation of the MOLE66 ransomware with Russia.

The changes and data encryption that this ransomware initiates make data decryption practically impossible. Free decryptor has not been developed yet. Nevertheless, paying the ransom is not recommended due to the risk of both data and money loss. Even more, a supposed MOLE66 decryptor might be a rootkit that may download other malicious programs to your PC.

The only reasonable solution is to remove MOLE66 CryptoMix ransomware and recovery locked files from backups. If you don't backup your data, it might be problematic to get your files for free. Nevertheless, we would strongly recommend not to trust criminals and restrain from paying the ransom.

  • C:\WINDOWS\system32\cmd.exe" /C sc stop VVS"
  • C:\WINDOWS\system32\cmd.exe" /C sc stop wscsvc
  • C:\WINDOWS\system32\cmd.exe" /C sc stop WinDefend
  • C:\WINDOWS\system32\cmd.exe" /C sc stop wuauserv
  • C:\WINDOWS\system32\cmd.exe" /C sc stop BITS
  • C:\WINDOWS\system32\cmd.exe" /C sc stop ERSvc
  • C:\WINDOWS\system32\cmd.exe" /C sc stop WerSvc
  • C:\WINDOWS\system32\cmd.exe" /C vssadmin.exe Delete Shadows /All /Quiet"
  • C:\WINDOWS\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled No"
  • C:\WINDOWS\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures"
Screenshot of Mole66: crypromix ransomware
Mole66 in our 2018 report.
Screenshot of Mole66: ransomware
Mole66 in our 2018 report.

From our report of Mar 2018 · not reviewed since

Possible ways to fall ransomware victim

Like CryptoMix and its family members, this particular ransomware exploits a multitude of social engineering strategies to attack people's PCs.

Statistically, these are the most frequently used methods to spread the infection:

According to NoVirus.uk experts, there's no hundred percent protection from ransomware. Even the best anti-virus with updated definitions and real-time protection might fail to recognize zero-day and other attacks.

Thus, people must comply with safe online behavior rules. First of all, avoid visiting illegal and highly suspicious content.

Gambling and porno sites are at the tops of the domains that are most frequently filled with malicious content. Besides, avoid installing updates and software when prompted by pop-up ads. Finally, don't forget to backup your files regularly.

  • malicious spam email attachments;
  • malvertising;
  • fake software updates or downloads;
  • exploit kits.

The Mole66 ransomware note

Text of _HELP_INSTRUCTIONS_.TXT

Contents of the note on redemption:

!!! All your files are encrypted !!!

What to decipher write on mail alpha2018a@aol.com

Do not move or delete files !!!!

---- Your ID: ***** ----

!!! You have three days otherwise you will lose all your data. !!!

How to remove Mole66 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 Mole66 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

    Mole66 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 confirm the family

    Copy _HELP_INSTRUCTIONS_.TXT and one or two files ending in .mole66 to a USB stick, and leave the originals where they are.

    From another device, upload the note and a sample file to ID Ransomware or No More Ransom's Crypto Sheriff, which name the family from the note, the extension and the file structure.

    Write down the contact address and your personal ID from the note, because a decryptor or the police may ask for them.

    Warning: Never contact the attackers from the infected Windows 11 or Windows 10 PC.

    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 Mole66, no free decryptor is known (checked 7 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 Mole66 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 Mar 2018 · not reviewed since

Uninstall Mole66 Cryptomix ransomware for good

Manual Mole66 removal is not possible.

The ransomware is a severe infection which alters some of the core system's functions. To get rid of it completely, you will have to use a professional anti-virus program, say . Besides, do not forget to update it before running a scan.

In most of the cases, people cannot remove Mole66 ransomware easily because it is programmed disable antivirus programs. Thus, you may need to boot the system into Safe Mode with Networking.

[GI=method-1]Mole66 CryptoMix virus tends to block anti-virus programs. To launch it, boot the system into Safe Mode with Networking.

As we have already pointed out, Mole66 ransomware virus deletes Volume Shadow Copies, disables Windows Recovery, and Repair options.Thus, you don't have many choices to recover your files, though third-party data recovery tools can help:

This software has been developed to retrieve accidentally deleted files or recover them after system's crash. However, it can find files encrypted by ransomware as well.

Try free CryptoMix decryptor

Although Mole66 ransomware does not have a decryptor, it belongs to the CryptoMix family, so the official CryptoMix decryptor might turn out to be helpful.

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 Mole66 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 .mole66 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 Mole66 ransomware

How do I open .mole66 files?

You cannot open them by renaming or by choosing another program. The .mole66 ending shows that Mole66 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 Mole66. Store the encrypted files on an external disk until then.

How did Mole66 get on my computer?

The way Mole66 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 .mole66 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 there a free Mole66 decryptor?

We last checked on 7 October 2026, and for Mole66 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 "Mole66 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.

Did Mole66 steal my files or passwords?

We do not know yet. Nothing published so far shows data theft by Mole66, but the only confirmed sign is files that end in .mole66 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 Mole66 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 .mole66 from the file names?

You can try it on a copy, but for real ransomware it will not help. The .mole66 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.

Should I open _HELP_INSTRUCTIONS_.TXT?

Reading it is fine if you open it in Notepad. A plain text _HELP_INSTRUCTIONS_.TXT cannot harm the PC. Be careful with notes in HTA or HTML format: double-clicking those runs them in a window that can contain scripts, so right-click and choose Open with > Notepad instead.

The note tells you the contact addresses, the claimed amount and the deadline. Do not visit links or write to the addresses from this PC. Use the note to identify the family and check for a free decryptor first.

Will Fortect remove Mole66?

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 Mole66, 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. Rakhesh: Symmetric key algorithms (read October 7, 2026)
  2. CISA: StopRansomware (read October 7, 2026)
  3. No More Ransom (read October 7, 2026)
  4. FTC: How to recognize, remove and avoid malware (read October 7, 2026)
  5. Microsoft Learn: Microsoft Defender Offline (read October 7, 2026)

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