Isal Ransomware (.isal Files)

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

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About Isal Ransomware:

NameIsal Virus
File Extenstion.isal
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Offline IDm3KmScxfDyEQzJYP8qjOSfP4FvpsOXlekGuMPzt1
Last seenJanuary 30, 2023
AlgorithmSalsa20 encryption. If Isal 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 .isal 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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtuC65YmclqGA04qj0GQr eoGBjYj9i7nkrUaCsr0oDOLI11obtWdNxDREHWX4OUUTlZg+JE8iuK0f0TgHuIzm fmszo9vaC9BgoQwRDQ3V3PXLiMxuJgJGTdIJV8I8QXlaBHZZ2Oi+c6/7wl9ZBXvh O64B+JLobdm6YLRJh8EEOhmcCJ9OQwi+0hkWn1UoI2NBN92Yh/npcThdZbd6+uHN ATiCo6A8sOQHGnuMOUxINyXvtBwfGUWHW7miUIpqh8GTZ07bmztNOEUa28A1t0Sv HftkX+JWEk6uQIVDVv6msUKUOf5qVxBMrk46FXR7Gftp8wUlZhqclkTUiUA3ElZt yQIDAQAB -----END PUBLIC KEY-----
Other variants
  • Bttu Ransomware (.bttu encrypted files)
  • Btos Ransomware (.btos encrypted files)
  • Btnw Ransomware (.btnw encrypted files)
  • Isal Ransomware (.isal Files) - What is it? Keep Your Privacy Well

    Isal 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.

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

    .ISAL 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 Isal 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]

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    ๐Ÿ”— Remove Erop Virus Ransomware (+File Recovery)
    ๐Ÿ”— Remove Erqw Virus Ransomware (+File Recovery)
    ๐Ÿ”— Remove Assm Virus Ransomware (+File Recovery)

    Indicators of Compromise(IOC)

    File NameMD5File Size
    ๐Ÿ“œ SAMPLE.EXE862a2777f1dcbdb1ef0c5ce209d3a205823296
    ๐Ÿ“œ SAMPLE.EXE4d87efcbf6116dab4345e6a1bf1b6c96823808
    ๐Ÿ“œ SAMPLE.EXE556bc8de79990e475f7131028e98ea2f823808
    ๐Ÿ“œ SAMPLE.EXE932e1fdc587695a02489692332c32522823808
    ๐Ÿ“œ SAMPLE.EXE4ee2a9eeb508e0415820f40548f62ac8823296
    ๐Ÿ“œ SAMPLE.EXEb1bf6b7c18cb925decc155bbec1b56ae754176
    ๐Ÿ“œ SAMPLE.EXE984c74be16f2380f5e0b8d6bf7a41277823296
    ๐Ÿ“œ SAMPLE.EXEfca58e6592418176893129de01892810754176
    ๐Ÿ“œ SAMPLE.EXE05f773a5fe17a746394c9924f00311e3754688
    ๐Ÿ“œ SAMPLE.EXE5549cb42e01ba7d3036f72dfde66dee0754688