Isza Ransomware (.isza Files)

Isza 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 Isza Ransomware:

NameIsza Virus
File Extenstion.isza
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Offline IDm3KmScxfDyEQzJYP8qjOSfP4FvpsOXlekGuMPzt1
Last seenDecember 29, 2022
AlgorithmSalsa20 encryption. If Isza 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 .isza 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
  • Iswr Ransomware (.iswr encrypted files)
  • Isal Ransomware (.isal encrypted files)
  • Bttu Ransomware (.bttu encrypted files)
  • Isza Ransomware (.isza Files) - What is it? Keep Your Privacy Well

    Seeing that your files have .isza extension and _readme.txt files in various folders mean that you are infected with Isza 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.

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

    .ISZA 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 Isza 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)
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    ๐Ÿ”— Remove Assm Virus Ransomware (+File Recovery)

    Indicators of Compromise(IOC)

    File NameMD5File Size
    ๐Ÿ“œ SAMPLE.EXE0b62bf3b0cb87a93e2c96c3ea180b7cb754688
    ๐Ÿ“œ SAMPLE.EXE048c5750cce12e02e62aa2f2b961629d319488
    ๐Ÿ“œ SAMPLE.EXEf893fb779905b795bd58d0226994c29b337920
    ๐Ÿ“œ SAMPLE.EXEce69dffa5cb66c7ddeac1c939ac1e4d0233984
    ๐Ÿ“œ SAMPLE.EXE908e12a8429d24e50da4f118967cad89338944
    ๐Ÿ“œ SAMPLE.EXEcbb3fc3f0bb810db7db3a656fca98ea5337920
    ๐Ÿ“œ SAMPLE.EXE3e441de95e2420c687854be3e542ba62338432
    ๐Ÿ“œ SAMPLE.EXE39ae94b477862b5aa1521c69172cb140326144
    ๐Ÿ“œ SAMPLE.EXE2b79f0afb2dc42c780798c703991a6b7326656
    ๐Ÿ“œ SAMPLE.EXE88d7dc05b7794c43d3139459c59887c3325120