How to remove the 1BTC ransomware infection

Also Known As: 1BTC virus
Distribution: Moderate
Damage level: Severe

1BTC ransomware removal instructions

What is 1BTC?

First discovered by Jakub Kroustek, 1BTC is yet another variant of high-risk ransomware called Dharma. As with its predecessor, 1BTC encrypts most stored files and appends each filename with the victim's unique ID, developer's email address, and ".1BTC" extension. For example, "sample.jpg" might be renamed to a filename such as "[].1BTC". Following successful encryption, 1BTC opens a pop-up window and stores the "RETURN FILES.txt" text file on the desktop.

The pop-up window and text file inform victims of the current situation and encourage them to contact 1BTC's developers. The pop-up provides the most detail and essentially states that data is encrypted and that a unique decryption key is necessary to restore it. Unfortunately, this information is accurate. Files are encrypted using the RSA-1024 encryption algorithm, which generates a unique decryption (private) key for each victim. All keys are stored on a remote server controlled by cyber criminals. Therefore, victims are forced to pay a ransom to restore data. The cost is not specified, however, a deadline of seven days is given by which victims must pay using the Bitcoin cryptocurrency. Note that ransoms usually fluctuate between $500 and $1500. Regardless of the cost, do not pay. Research shows that cyber criminals usually ignore victims once payments are submitted. Therefore, paying typically gives no positive result and users are scammed. Unfortunately, there are no tools capable of cracking 1BTC encryption and restoring data free of charge. Therefore, the only solution is to restore everything from a backup.

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

1BTC decrypt instructions

The internet is full of ransomware-type infections that share similarities with 1BTC. The list of examples includes V6cye, Berosuce, Acton, and many others. As with 1BTC, most ransomware infections, these also encrypt data so that developers can generate revenue by blackmailing victims and offering paid recovery of their files. Unfortunately, encryptions are usually performed using AES, RSA, and other high-end algorithms that generate unique decryption keys for each victim. Therefore, restoring data manually (without developers' involvement) is virtually impossible, unless the malware is still in development and/or has certain bugs/flaws. Ransomware presents a strong case for maintaining regular backups, however, store them on a remote server or unplugged storage device, since locally stored backups are compromised together with regular data. Additionally, have multiple backup copies stored in different locations, since there is always a chance that servers/storage devices can be damaged.

How did ransomware infect my computer?

It is currently unknown exactly how developers proliferate 1BTC, however, these infections are usually distributed using third party software download sources (freeware download/free file hosting websites, Peer-to-Peer [P2P] networks, and similar), spam email campaigns, trojans, and fake software cracks/updaters. Criminals use unofficial download sources to present malicious executables as legitimate software, thereby tricking users into manually downloading and installing malware. Spam email campaigns are also used in a similar manner. Criminals send hundreds of thousands of deceptive emails containing malicious attachments and messages presenting them as 'important documents' (e.g., invoices, receipts, bills, etc.) and encouraging recipients to open them. Trojans are malicious applications designed to cause chain infections. They stealthily infiltrate computers and inject them with additional malware. Fake 'cracks' simply infect systems rather than providing users with access to paid features. The same applies to fake updaters, which infect computers by exploiting outdated software bugs/flaws or merely downloading and installing malware rather than updates. In summary, the main reasons for computer infections are poor knowledge of these threats and careless behavior. The key to safety is caution.

Threat Summary:
Name 1BTC virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .1BTC (this ransomware also appends filenames with the victim's unique ID and developer's email address)
Ransom Demanding Message Pop-up window, RETURN FILES.txt text files
Cyber Criminal Contact, 
Detection Names Avast (Win32:RansomX-gen [Ransom]), BitDefender (Trojan.Ransom.Crysis.E), ESET-NOD32 (A Variant Of Win32/Filecoder.Crysis.P), Kaspersky (, 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.
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 1BTC virus our malware researchers recommend scanning your computer with Spyhunter.
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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?

To prevent this situation, be very cautious when browsing the Internet and downloading/installing/updating software. We strongly recommend that you download software from official sources only, preferably using direct download links. Keep installed software and operating systems updated, however, use only implemented functions or tools provided by the official developer. Third party downloaders/installers/updaters often include rogue apps and, therefore, using these tools is risky. Most software cracks are fake and there is a high probability that using these tools will lead to system infections. In addition, software piracy is a cyber crime: in effect, stealing from software developers. For these reasons, cracking installed applications should never be considered. Handle all email attachments with care. If the file/link is irrelevant or the sender seems suspicious, do not open anything. Have a reputable anti-virus/anti-spyware suite installed and running, since these tools detect and eliminate malware before the system is harmed. The key to computer safety is caution. If your computer is already infected with 1BTC, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in 1BTC ransomware pop-up window:

You can send us up to 1 file for free decryption. The total size of files must be less than 1Mb (non archived), and files should not contain valuable information. (databases,backups, large excel sheets, etc.)
When you make sure of decryption possibility transfer the money to our bitcoin wallet. As soon as we receive the money we will send you:
1. Decryption program.
2. Detailed instruction for decryption.
3. And individual keys for decrypting your files.
Do not rename encrypted files.
Do not try to decrypt your data using third party software, it may cause permanent data loss.
Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

Screenshot of 1BTC text file ("RETURN FILES.txt"):

1BTC text file

Text presented within this file:

All your data is encrypted!
for return write to mail: or

Screenshot of files encrypted by 1BTC (".1BTC" extension):

Files encrypted by 1BTC

1BTC ransomware removal:

Instant automatic removal of 1BTC 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 1BTC 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 1BTC 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 1BTC 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 1BTC 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 1BTC 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 1BTC, 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 1BTC 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 1BTC 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
1BTC virus QR code
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