Btnw Ransomware (.btnw Files)

Btnw Ransomware uses the Salsa20 encryption algorithm. This STOP/Djvu family is one of the most popular infection!

You may be interested in taking a look at our other antivirus tools:
Trojan Killer, Trojan Scanner.

About Btnw Ransomware:

NameBtnw Virus
File Extenstion.btnw
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Offline ID8p2Go5ZmkbFk0DF2oJ6E8vGEogpBqqaGCWjto1t1
Last seenJanuary 25, 2023
AlgorithmSalsa20 encryption. If Btnw cannot establish a connection to crooks server before starting the encryption process, it uses the offline key. This key is the same for all victims(!), making it possible to decrypt .btnw files in the future.
RansomFrom $490 to $980 (in Bitcoins)
  1. โฎž Can delete Volume Shadow copies to make victimโ€™s attempts to restore data impossible;
  2. โฎž Adds a list of domains to HOSTS file to block access to certain security-related sites;
  3. โฎž Installs password-stealing Trojan, like Redline Stealer, Vidar Stealer, Smokeloader, Azorult and others;
DistributionThird-party downloaders, installers, peer-to-peer networks, RDP exploits, etc.,
RSA Public Key-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2WGo+MCJG9I8Lre0I/T5 sfqPRJrCtTzfUXF0FjPEKhanNQiJw+EQgBU271jzSh1f7wk4ayYWtBAYHjqtzsQw yl5YXvU0LqZbmnfvZX76vC2+jJVu9PNpImVquYPPRNgons3BTKJT+BiqqO/LzXFw h3iyROlCo1vwmH+hX6MZoMAVWhme50Cs7uKFiNiIwpVyYc9hgXHkVGJC6aWwwTFU cYd6AM1cjjjw7EURP54jjZtHQD9KKv2NHMYVt2jf+mCIXN1v6F2s56bwM+moWdG3 uMZpwo15UmBQtf+wDqAI+yYIpb/1y80JFinAWrCO4DGUzQ/vlrzSwjN5fmX7clnP 6wIDAQAB -----END PUBLIC KEY-----
Other variants
  • Matu Ransomware (.matu encrypted files)
  • Maos Ransomware (.maos encrypted files)
  • Manw Ransomware (.manw encrypted files)
  • Btnw Ransomware (.btnw Files) - What is it? Keep Your Privacy Well

    Seeing that your files have .btnw extension and _readme.txt files in various folders mean that you are infected with Btnw ransomware. This sort of malware is created to extort money from the users, previously encrypting the files on its PC. It is likely impossible to decrypt the files without special software.

    Btnw virus and any other member of the STOP/Djvu family use the Salsa20 encryption mechanism. This cipher has an enormous amount of possible decryption keys, so it is impossible to brute force them, for example. Even with quantum computers, you will likely spend more time than our planet will approximately exist. But donโ€™t worry - using specific applications designed especially for file decryption purposes, you may get your files back in just several hours.

    The main ways of Btnw ransomware distribution are third-party websites that offer the users to get some programs for free or use different dubious tools. Hackers who break the license checking procedure in programs (this action allows them to use the program without any payments) inject malicious code, or even the whole virus, into their โ€œproductsโ€. Malware developers pay such people.

    Dubious tools are even easier to use for that purpose. Usually, they are created for outlaw actions, like generating the license keys for specific programs or activating Windows without any payments. Antivirus programs detect all such apps, so crooks always instruct you to disable your security tool or add the hack tool to the allowlist. Unfortunately, you will not understand what happens until it is too late.

    Encryption process

    The Btnw ransomware uses the Salsa20 encryption algorithm. That is not the strongest method, but it still provides an overwhelming amount of possible decryption keys. To brute force the 78-digit number of keys, you need 3.5 unvigintillion years (1*10^65), even if you use the most powerful regular PC. Quantum computers can show a bit better results, but it is still too slow to get your files back while you are alive.

    The exact algorithm of encryption is next: malware scans each folder for the files it is able to encrypt. Then, when it finds the target, it makes a copy of your file, removes the original one, encrypts the copy and leaves it instead of the removed original. Such a procedure is done to prevent the situation when you have already opened the file, so ransomware is not able to read it because of the Windows restrictions. To each encrypted copy, the virus adds the specific extension - ".btnw". Then, ransomware creates a _readme.txt file in the folder where the encrypted file is located, and goes to the next folder.

    .BTNW Files

    Such an encryption method can be exploited for file recovery. Since the original file is deleted, you may try to recover it using the file recovery tools. The less time is passed - the bigger the chance to get your files back, so hurry up!

    Another specific moment that can help you to use the files even after the encryption is the fact that Btnw ransomware encrypts only the first 150KB of each file. Hence, you can try to run a big file, such as video or music, without the encryption. Similar feature also works with other ransomware families - Dharma, Conti and Makop encrypt the same 150KB.

    Ransom note: _readme.txt

    Ransom note is the same for the whole ransomware family. In fact, it is one of the main signs of to which family the certain ransomware belongs. Here is the typical note for STOP/Djvu family:


    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:
    [email protected]

    Reserve e-mail address to contact us:
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    Indicators of Compromise(IOC)

    File NameMD5File Size
    ๐Ÿ“œ SAMPLE.EXE552c86e1e74ddb742f2cd0c901ff5011770560
    ๐Ÿ“œ SAMPLE.EXE2402151daffbdf745a8acd0ae12ec270768000
    ๐Ÿ“œ SAMPLE.EXEf73e4f38f780e32565b6fabd7f4a924d768512
    ๐Ÿ“œ SAMPLE.EXEabdecf396125ed6985112d0b9bc94d2d768000
    ๐Ÿ“œ SAMPLE.EXE75de9a4c6e90b43030277ac594c11116767488
    ๐Ÿ“œ SAMPLE.EXEbd7302ea911a88e7e25eb1782fe894d6768000
    ๐Ÿ“œ SAMPLE.EXEa45ffa4541676303cabc41bb6a1b9cd4767488
    ๐Ÿ“œ SAMPLE.EXE588304e58148b40110402fa9166b29451273856
    ๐Ÿ“œ SAMPLE.EXEd475e79a41ff72af77c7c5f298044c60768000
    ๐Ÿ“œ SAMPLE.EXE23f7a30f806a2a55fbcd14722a4074a7768000