bitcoin666 Ransomware

Also Known As: bitcoin666 virus
Distribution: Low
Damage level: Severe

bitcoin666 ransomware removal instructions

What is bitcoin666?

Discovered by MalwareHunterTeam, bitcoin666 is one of many ransomware-type programs on the internet. Cyber criminals use bitcoin666 to prevent victims from accessing their files (by making the data unusable). To recover their files, victims are encouraged to pay the developers a ransom. This malicious program renames each encrypted file by adding the "" extension. For example, "1.jpg" becomes "". A ransom message in a text file called "Recover Files.TXT" can be found in each folder that contains encrypted files. Furthermore, bitcoin666 changes the desktop wallpaper.

The ransom message states that victims can only regain access to their files by paying cyber criminals .3 Bitcoin into the Bitcoin wallet address provided. If payment is not paid within 24 hours, the cost of decryption increases to .4 Bitcoin. Before paying, it is possible to send a file (no larger that 5 MB) to bitcoin666's developers. They will then decrypt the file free of charge as so-called 'proof' that they have decryption tool. To contact cyber criminals, victims are encouraged to use the or email address. They also warn victims not to try to decrypt files using another decryption tool. They state that this might cause permanent data loss. Generally, only cyber criminals (ransomware developers) can provide victims with decryption tools or keys. The ransomware-type programs use encryptions that can be decrypted using tools held only by them. Despite this, do not pay these cyber criminals. They send no decryption tools, take the ransom money, and then simply ignore victims. There is no free way to decrypt files encrypted by bitcoin666, at least not at the moment. Therefore, we recommend that you use data backup (if one has been created) and restore files from there.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

bitcoin666 decrypt instructions

Ransomware-type programs are usually very similar - most are used to encrypt files and keep them locked unless a ransom is paid. Some examples of other programs of this type are MegaLocker, Langolier, and Etols. Main differences are usually cost of decryption and cryptography algorithm (symmetric or asymmetric) used to encrypt files. Unfortunately, most victims are forced to contact cyber criminals, since ransomware-type programs are impossible to 'crack' without using tools held only by them. They can be cracked without the involvement of ransomware developers only if a program is not fully developed, has bugs/flaws, and so on. To avoid data loss in future, maintain data backups and store them on remote servers or unplugged storage devices.

How did ransomware infect my computer?

To proliferate computer infections, cyber criminals use spam campaigns, Trojans, dubious software download sources, fake software update tools, and programs that activate paid software free of charge ('cracking' tools). They attempt to cause computer infections through spam campaigns by sending emails that include malicious attachments. The main purpose of this method is to trick people into opening attached files or links leading to them. Included attachments are usually executables (.exe and other files), archives such as RAR, ZIP, PDF, Microsoft Office documents, JavaScript files, etc. When downloaded and opened, these files infect computers by installing viruses. Trojans are malicious programs that proliferate other viruses, thus causing chain infections, however, they must first be installed. Free file hosting, freeware download websites, Peer-to-Peer networks such torrent clients, eMule, unofficial websites and other untrustworthy software download sources, are often used to present malware as harmless, legitimate files. When people download and open them, they often cause installation of high-risk viruses. Fake software update tools proliferate computer infections by downloading malicious programs rather than the updates/fixes, or by exploiting outdated software bugs/flaws, and so on. Tools that people use to bypass paid software activation can also be used to proliferate viruses - they install malicious programs rather than providing free access to software.

Threat Summary:
Name bitcoin666 virus
Threat Type Ransomware, Crypto Virus, Files locker.
Encrypted Files Extension
Ransom Demanding Message Recover Files.TXT text file.
Ransom Amount .3 or .4 Bitcoin.
Cyber Criminal Contact,
Detection Names (bitcoin666.exe) Avast (Win32:Trojan-gen), BitDefender (Gen:Variant.Ransom.HiddenTear.1), ESET-NOD32 (a variant of MSIL/Filecoder.AK), McAfee (Ransomware-FTD!5A7F266D0CC5), Full List Of Detections (VirusTotal)
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in Bitcoins) to unlock your files.
Additional Information Changes victim's desktop wallpaper.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.

To eliminate bitcoin666 virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

Files attached to emails received from unknown/suspicious addresses and presented in an irrelevant message should not be trusted. All software should be downloaded from official websites and using direct links. Other sources mentioned above should not be used. Installed programs or operating systems should be updated via tools or implemented functions that are provided by official software developers only. If installed software is not free of charge, it should be activated properly - use of 'cracking' tools is a cyber crime and also leads to installation of malicious programs. Have reputable anti-virus or anti-spyware software installed and keep it enabled at all times. These tools can prevent computer infections with viruses. If your computer is already infected with bitcoin666, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in bitcoin666 ransomware text file "Recover Files.TXT":

PC id: -
ATTENTION!!! All your files are encrypted.
If you want to get your files back, you should pay me 0.3 BTC on the following address:
You have only 24 hours since you received that e-mail, after that price will be 0.4BTC.
To prove that we can bring back your files, attach a file between 1~5mb to be decoded.
After recieving your payment I'll send you a simple program and encryption key for it.
Note:Trying to recover your files with another program may result in a fatal loss of all your files. Only the original decoder and key can bring all your files back.
You can buy bitcoins here:
Here's a FAQ how to buy and send bitcoins (any language):hxxps://
Write us: or

Screenshot of bitcoin666 desktop wallpaper:

bitcoin666 wallpaper

Screenshot of files encrypted by bitcoin666 ("" extension):

Files encrypted by bitcoin666

bitcoin666 ransomware removal:

Instant automatic removal of bitcoin666 virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of bitcoin666 virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the bitcoin666 virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the bitcoin666 ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining bitcoin666 ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of bitcoin666 are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by bitcoin666, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as bitcoin666 ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the Documents, Pictures, Videos, Music, Favorites as well as Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove bitcoin666 ransomware:

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global virus and spyware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
bitcoin666 virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of bitcoin666 virus on your mobile device.
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Platform: Windows

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