Matu Ransomware (.matu Files)

Matu 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 Matu Ransomware:


NameMatu Virus
Version0616
File Extenstion.matu
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Note_readme.txt
Offline IDM6quF9d1g2LNWnBiQpTSgbW26JwEOrFwFfT1xGt1
Last seenDecember 14, 2022
AlgorithmSalsa20 encryption. If Matu 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 .matu 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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvgy/HsMQQL1muOzUALs+ gn9QUNBiBZRTampeEKRv3yPSoYj5QcTVI+u6bS1Fp+BpOzu2aYoXwqT+DABpFnE0 NDxOlBViEnvwgJBytCtR6iFy3VQv5GPnMgPByygiMFWfBsoSaTMDi5DeXq9mYw+V pDkiVKjMHfe1/zRUTLibr2G7TdDSea735c0RSk9/QYO8ICeMLx+CO77ogiqVmF9t T28ykuIn0+637yhYfATnUJe4XjFkyi3M0B/s2wNfr8h/1eKH+Zr0C1TAaB/9LI27 OKjhQVb3FqgFMNPZnAsHj+OPEUXSlZPv7RRHeuc4rZ30T7jV3Qy7lpyworh3CD3Z LQIDAQAB -----END PUBLIC KEY-----
Other variants
  • Maos Ransomware (.maos encrypted files)
  • Manw Ransomware (.manw encrypted files)
  • Mbtf Ransomware (.mbtf encrypted files)
  • Matu Ransomware (.matu Files) - What is it? Keep Your Privacy Well

    Matu 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.

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

    .MATU 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 Matu 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-67n37yZLXk
    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 Sapp Virus Ransomware (+File Recovery)
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    ๐Ÿ”— Remove Erqw Virus Ransomware (+File Recovery)

    Indicators of Compromise(IOC)

    File NameMD5File Size
    ๐Ÿ“œ SAMPLE.EXEf5f129871db2f34f3000b81fd164c3b6169965
    ๐Ÿ“œ SAMPLE.EXEd289970d5096a9c99e99a0e08e0a2f73170170
    ๐Ÿ“œ SAMPLE.EXE855d4dc4926a678a6f58f9e57c6eccbc244224
    ๐Ÿ“œ SAMPLE.EXE9746e931befe5203bf5508cfa8cd17d1245248
    ๐Ÿ“œ SAMPLE.EXE7ca4d4ca99e04052b638422677b7add0245760
    ๐Ÿ“œ SAMPLE.EXE0453295e7a2cbdaaeeb55c35d79027c9169349
    ๐Ÿ“œ SAMPLE.EXE117665adcf6258541591a576ef8f1bb0245760
    ๐Ÿ“œ SAMPLE.EXEa086c884d1dc2920e8a959fcb8457f93245760
    ๐Ÿ“œ SAMPLE.EXE26bb98a440f7a5cfeef821c3bbc3f896246784
    ๐Ÿ“œ SAMPLE.EXE9bcae69d99d3a068f7e709ec4e099a59204328