Nuis Ransomware (.nuis Files)

Nuis 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 Nuis Ransomware:

NameNuis Virus
File Extenstion.nuis
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Last seenOctober 28, 2022
AlgorithmSalsa20 encryption. If Nuis 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 .nuis 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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAz1rm5ao2VYErKeJi6JV4 Yl+Blgu7z7Kkn7g8C00PIN5IjmLs8JwLzTLT7VJaJ4OlQW7mtjeeunUByrkKkXg+ a1sutT5YTsyDoNt+hq74aFkE2qZhh6mdvCkOQKFpqfgIT5LdcH9pKVLoqtG5Ycjx /JKnwc5HfvHAgidiMR6C+LONPb5j6D3Tm2mJWLLSwq0WRNsEF+ctgCytUZvNi5iy wH7PhFS/rZXanMgAncNcI/+DIn7tNEFqt3JqQG9U8KWke5SGtcbjDkZX6/TDOvQC oY1JEsK/Ex1yUqHgWHT3pVcVPfakAWTMxaxXBiB+3upkeY/S2mJ7MDbRrjmf5RNh AwIDAQAB -----END PUBLIC KEY-----
Other variants
  • Tury Ransomware (.tury encrypted files)
  • Tuow Ransomware (.tuow encrypted files)
  • Tuis Ransomware (.tuis encrypted files)
  • Nuis Ransomware (.nuis Files) - What is it? Keep Your Privacy Well

    Nuis ransomware is always a thing that is better to avoid. This virus harms too much, not only your files but also your wallet. Moreover, it also breaks into your computerโ€™s configurations and weakens your system. Thus, it is better to prevent its appearance than to think about how to deal with the consequences of its activity.

    Almost all cases of Nuis virus injection are related to the use of โ€œfreeโ€ programs. These apps are about to be purchased, but hackers remove the license checking to be launched and used without any payments. While dealing with license checking, hackers can easily add malware to the program code. Which one - depends only on how much they are paid for this. Nuis ransomware is another example of such a virus.

    Salsa20 is the encryption algorithm used by this virus for file encryption. It is not the strongest among the existing ones, but its strength is heavily increased by the key stored on the remote server. Since ransomware maintainers control servers, there is no way to get vital besides paying the ransom. Brute force is useless because of the vast number of possible keys (>1*10^78). File decryption tools may give you a chance, but the opportunity to get your files back is low.

    Encryption process

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

    .NUIS 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 Nuis 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:
    [email protected]

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    Indicators of Compromise(IOC)

    File NameMD5File Size
    ๐Ÿ“œ SAMPLE.EXEa09a74c354f61b13b696bf54384959f31273856
    ๐Ÿ“œ SAMPLE.EXE046574dc17dca15013376cc8af4c799f757248
    ๐Ÿ“œ SAMPLE.EXE436611c2bcb98900e1511bf06fa8ed69735232
    ๐Ÿ“œ SAMPLE.EXE5e9f2be25372093f388c2270f6c16d7c735232
    ๐Ÿ“œ SAMPLE.EXEf7f53eedecb04a3ebb8732d0755b5784724480
    ๐Ÿ“œ SAMPLE.EXEc1888ab06c519843b7d90a5abad76ac3734208
    ๐Ÿ“œ SAMPLE.EXEd9d62055b84b7bb025c8fe0a9b9d2a8e740352
    ๐Ÿ“œ SAMPLE.EXEe38fcd5e4962c10f75bff0f76ecab9e0739840
    ๐Ÿ“œ SAMPLE.EXEaf033c6998cdb54a2776d33bd8183999739328
    ๐Ÿ“œ SAMPLE.EXE863988806e017a879deee2fe51ac2afe739840