Bttu Ransomware (.bttu Files)

Bttu 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 Bttu Ransomware:


NameBttu Virus
Version0619
File Extenstion.bttu
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Note_readme.txt
Offline ID8p2Go5ZmkbFk0DF2oJ6E8vGEogpBqqaGCWjto1t1
Last seenJanuary 23, 2023
AlgorithmSalsa20 encryption. If Bttu 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 .bttu files in the future.
RansomFrom $490 to $980 (in Bitcoins)
Damage
  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
  • Btos Ransomware (.btos encrypted files)
  • Btnw Ransomware (.btnw encrypted files)
  • Matu Ransomware (.matu encrypted files)
  • Bttu Ransomware (.bttu Files) - What is it? Keep Your Privacy Well

    Bttu ransomware is a โ€œclassicโ€ example of ransomware infection. This virus penetrates your PC, encrypts the files, and then asks you to pay money for its decryption. The average amount of ransom is $980. In addition, fraudsters threaten you that your files will be deleted or that your files will not be decrypted. The only thing that matters is that it changes many of your system settings.

    Malware alters your systemโ€™s configurations to make it weaker and prevent the early detection of virus injection. In addition, the virus blocks the Microsoft Defender (it just becomes inactive) and restricts the launch of antivirus software installation files. These changes must be reverted as soon as possible because you will also struggle to install other programs.

    Bttu ransomware encrypts your files with a robust ciphering algorithm - Salsa20. This algorithm is typical for all other STOP/Djvu ransomware family members. It is likely impossible to hack that cipher in common ways - this encryption algorithm means 1.158x10^77 (78-digit number) of possible decryption keys. Brute forcing will take more than two unvigintillion years.

    Encryption process

    The Bttu 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 - ".bttu". Then, ransomware creates a _readme.txt file in the folder where the encrypted file is located, and goes to the next folder.

    .BTTU 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 Bttu 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:

    ATTENTION!

    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:
    https://we.tl/t-Q5EougBEbU
    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]

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    Indicators of Compromise(IOC)

    File NameMD5File Size
    ๐Ÿ“œ SAMPLE.EXE8849170651cd708eb5e227449a50f3c3335872
    ๐Ÿ“œ SAMPLE.EXE9475023f1f830aa890cf33c8700a3380335872
    ๐Ÿ“œ SAMPLE.EXE48b9fa0cc39ab3ee91aa4ed8c8ef61bb335872
    ๐Ÿ“œ SAMPLE.EXE9c06b180481364e6ca02d9fad0ef9638334848
    ๐Ÿ“œ SAMPLE.EXE3a32e4d99d5f6cac1e6b0f6fd1b8a71c342016
    ๐Ÿ“œ SAMPLE.EXE6e78346ac820806217751e6803797f68340992
    ๐Ÿ“œ SAMPLE.EXE5c318b3592274eb5be64adf089c092ae334848
    ๐Ÿ“œ SAMPLE.EXE8e345f8a3549c12c711ad666304b8196145557
    ๐Ÿ“œ SAMPLE.EXE825450439c2aff52b4cb39ea80ac2a3b219648
    ๐Ÿ“œ SAMPLE.EXE0ece970911492f3719e4d1fb1e96c99d145557