BTOS Virus (.btos File) Ransomware — Remove & Decrypt Files

Written by William Reddy

If you cannot open your photos, documents, or data and also see the .btos extension on them, your computer is surely infected with Btos ransomware. It pertains to STOP/Djvu ransomware family

Btos ransomware ciphers personal documents spotted on the victim’s computer with the extension “.btos” and after that creates the ransom note in each folder which contains encrypted files. The instructions are put on the victim’s desktop in the “readme.txt” file. Its task is pretty much similar to other representatives of the same ransomware family: Bttu, Btnw, Matu.

What is Btos Ransomware?

NameBtos Virus
Ransomware family1DJVU/STOP2 ransomware
Ransomware note_readme.txt
RansomFrom $490 to $980,
SymptomsThe images, videos, and other documents have the “.btos” extension and cannot be opened by any programs
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Btos is file-encrypting ransomware that prevents normal access to your text files, Excel tables, videos and photos by ciphering them. It marks the ciphered files with the “.btos” extension. Then Btos ransomware adds a money ransom note (readme.txt) to each folder. In this note, you can see the instructions to pay the ransom ($490-$980 in Bitcoin) to a certain BTC wallet. The AES-256 or RSA-1028 cipher it utilizes to encrypt the files is not decryptable with modern computers. Even quantum PCs that currently exist will spend thousands of years to find the decryption key.

How dangerous is the Btos ransomware?

When Btos ransomware appears on your computer, it will run through your computer for images, videos, and important documents. It [ciphers all widespread file formats- .psd, .doc, .docx, .xls, .xlsx, .pdf, .jpeg, .png, et cetera. When these files are found, the ransomware will cipher them and change their extension to “.btos” to ensure that you understand what happened.

After the Btos ransomware encrypted the data on your computer, it will generate the last “readme.txt” file on the main screen. In addition to the ransom transactioning instructions, the victims also see the email addresses to contact the fraudsters – and

Here is the ransom note that the Btos ransomware shows to its victims:


Don't worry, you can return all your files!
All your files like pictures, 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:
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:

Reserve e-mail address to contact us:

How did the Btos ransomware get on my computer?

The Btos ransomware spreads by placing websites to download hacked programs or games. Cybercriminals that spread this ransomware are quite tricky, and try to correspond with the latest trends. New games introductions, new popular movies – Btos creators make everything to get their victims on that. Some of the most preferred tactics these criminals use is one-day websites with torrent downloading links. However, pursuing the modern things is not the single tactic these crooks utilize. Ways that have already become classic, such as email spamming, are likewise ordinary for STOP/Djvu ransomware distribution.

Malicious email spam

The example of email spamming that may lead to Btos ransomware injection

Preventing this ransomware does not require a lot of initiative. Following the ordinary rules of computer hygiene will considerably minimize all dangers. Bear in mind that opening all files you get on email is not a great option. Even worse scenario is to allow macros in Microsoft Office documents. However, it is far better to stop the malware intrusion at the moment when you have only opened the e-mail message. Inspecting the sender’s address can say a lot about what you can expect, and also when you see the thing like “”– it is likely a legitimate e-mail. At the same time, stuff that tries to appear like Amazon or FedEx shipment notification, but uses the e-mail address of “”– must make you be on the alarm. Above, you can see the illustration of such a message.

Illegal sources of different digital things need some additional explanation. Going against copyright policy already throws you to the chance of being fined. Nonetheless, using torrent trackers or third-party websites to download “free” programs likewise exposes you to different malware. Nobody can regulate unidentified people who launch the torrent seeding or release the hacked program version on the website with pirated program.

Btos virus removal instructions.

Download Trojan Killer Portable

Trojan Killer Portable Download

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This guide below shows how to use Trojan Killer Portable3 for Btos virus detection and removal:

  • STEP 1. Download and install Trojan Killer.

  • STEP 2. Click on "Finish".

  • STEP 3. Wait until necessary updates are downloaded and installed.

  • STEP 4. Select computer scan type.

  • STEP 5. The software will begin scanning your computer.

  • STEP 6. Click on "Cure PC".

Restore the files encrypted by the Btos ransomware

In most cases, it’s impossible to recover the files encrypted by the Btos ransomware because the private key needed to unlock the encrypted files is only available through cybercriminals. However, we’ve listed one option you can use to recover your files below.

Warning! Make sure you remove the ransomware from your system first, otherwise, it will repeatedly encrypt your files.

If your files were encrypted with an offline key, there is a chance you can recover them by using Emsisoft Decryptor for the STOP/Djvu decryption tool. Follow the below guide to recover your files using the Emsisoft Decryptor for STOP/Djvu.

  1. You can download Emsisoft Decryptor for STOP Djvu by clicking this link.
  2. When the decryptor has finished downloading, double-click on “decrypt_STOPDjvu.exe” to run this program on your computer.
  3. Click the “Decrypt” button to start the decryption process for Btos files. The screen will switch to a status view, informing you about your files’ current process and decryption status.
  4. The decryptor will inform you once the decryption process will be finished. If you require the report for your records, you can save it by clicking the “Save log” button.

If the Emsisoft Decryptor can’t decrypt your .btos files and you do not plan on paying the ransom, it is advised that you make an image of the encrypted drives so that you can decrypt them in the future.

Your computer should now be free of the Btos ransomware infection. However, suppose your current antivirus allowed this malicious program on your computer. In that case, you might want to consider purchasing the full-featured version of Trojan Killer to protect against these types of threats in the future.

Remove BTOS Ransomware Virus (DECRYPT .btos FILES)

Name: BTOS Virus

Description: BTOS Virus is a STOP/DJVU family of ransomware-type virus. It encrypts files, video, photos, documents. Encrypted files can be tracked by a specific btos extension. BTOS ransomware asks victims for a ransom fee about $490 - $980 in Bitcoin.

Offer price: 480

Currency: $

Operating System: Windows

Application Category: Virus

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About the author

William Reddy

I am from Ireland. My parents bought me a computer when I was 11, and several months after I have got a virus on this PC. I decided to enter the INSA Centre Val de Loire university after being graduated from the school. This French educational institution was offering a brand-new cybersecurity course. After getting the master's degree in cybersecurity, I've started working as a virus analyst in a little anti-malware vendor.

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