Nood Virus Ransomware (.nood File)

Nood Virus is a strain within the STOP/Djvu Ransomware family, employing the Salsa20 encryption algorithm to encrypt files on compromised systems. Victims are coerced into paying a ransom ranging from $499 to $999 in Bitcoins for the decryption key.

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About Nood Ransomware:


NameNood Virus
Version0855
File Extension.nood
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Note_readme.txt
Offline ID4p0Nzrg1q0ND5of5Gtp2UBjthSXuE8VxnMrd4vt1
Last seenMarch 20, 2024
AlgorithmSalsa20 encryption. If Nood 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 .nood files in the future.
RansomFrom $499 to $999 (in Bitcoins)
Damage
  1. ⮞ Can delete Volume Shadow copies to make victim’s attempts to restore data impossible;
  2. ⮞ Adds a list of domains to HOSTS file to block access to certain security-related sites;
  3. ⮞ Installs password-stealing trojan virus, 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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwDhAkjz9GllcG2a/Migh DXmQuzazCghfrC/zR+xWcKGzSgoH7n8GKqEzvwZYpn+mgGs1qufX46tgX6HxJSrZ vxm6Ki+oPKv5t7ktU2SicB8Ftu55iTWPDI5gec97hDb1un65qt5TSVBWcfQ19qu0 ctjEowpP723beQgUUTNdQTJoB6SItyjWOrIMXV2wrz861jqxCU/xwxV6TS09Rrwz Rxxmzyv1Xcei2DMyEhoP9BVHeaABQbnQ7wGqIXevdUpRqJ8AYvXHLB6Lno3IJ3Bo UMRDTNKY8JHMxg/b6l9vT6X1PH3qD29lk2SGpwW+5JvK6OUn5+Bncv0KmQj4HuXT awIDAQAB -----END PUBLIC KEY-----
Other variants
  • Wiaw Ransomware (.wiaw encrypted files)
  • Wisz Ransomware (.wisz encrypted files)
  • Lkfr Ransomware (.lkfr encrypted files)
  • Nood Virus Ransomware (.nood) File - How does it work?

    What is Nood ransomware?

    Nood ransomware attack is a pretty unwanted case. It ciphers the files and then asks you to pay the ransom in Bitcoins - about $1000 in equivalent. Money laundering is the single target of cybercriminals who spread this malware - they do not hunt for personal information or other confidential data.

    The cipher this virus uses is impossible to decrypt. Not only the type of encryption makes this process so hard - the decryption keys are stored on the remote server, controlled by crooks. Brute force or any other way to find the decryption key is useless because of the enormous amount of total possible keys (2*10^78).

    Nood malware also changes several vital parameters in your computer, making it harder to find the decryption solution. Blocking the running of installation files, preventing access to anti-malware forums and sites are the most harmful things it does. Meanwhile, several changes in other system configurations will surely make your PC harder to use.

    It is essential to know how you got this - at least to prevent the repeating malware injection. This virus is generally spread through the websites that distribute the “free” versions of well-known programs. For example, installing a hacked Photoshop may look like it carries nothing dangerous. Still, you never know if the user who fell the program added a virus into the application’s executable code.

    Encryption process

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

    .NOOD 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 Nood 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.
    Do not ask assistants from youtube and recovery data sites for help in recovering your data.
    They can use your free decryption quota and scam you.
    Our contact is emails in this text document only.
    You can get and look video overview decrypt tool:
    https://wetransfer.com/downloads/a832401adcd58098c699f768ffea4f1720240305114308/7e601a
    Price of private key and decrypt software is $999.
    Discount 50% available if you contact us first 72 hours, that's price for you is $499.
    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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    🔗 HowToFix.Guide: How To Decrypt .nood Files?

    Indicators of Compromise(IOC)

    File NameMD5File Size
    📜 SAMPLE.EXE373dbc2f5f92e4b275e9a6716b432d98775168
    📜 SAMPLE.EXE887ea5f3d717508b4c6349ca84dbdba8675198
    📜 SAMPLE.EXE5ff0ef9fa269b54d2b7b08f7854d880c695296
    📜 SAMPLE.EXE36d66e93b377ab343f73e8f9df0d9655995328