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NOOA Ransomware (.nooa File Extension)

NOOA 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 $490 to $980 in Bitcoins for the decryption key.

You may be interested in taking a look at our other antivirus tools:
Trojan Killer, and Online Virus Scanner.

About Nooa:


NameNooa Virus
Version0322
File Extension.nooa
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Note_readme.txt
Offline IDPLtnD1U6oAmgxgJ2nJik1mY9SwUQg07CiN0zSet1
Last seenOctober 11, 2024
AlgorithmSalsa20 encryption. If Nooa 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 .nooa 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 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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2r1lSLvQnrFh0wGNgxyr 2kWaJiYsAHrpOptSEJDQ2PwVuOTprCwl8hpWjI0rOeVRXsx3kW21+kpL7cRF0tg5 fnXcDcveUo/1Q6vUtuzdkoAA+eDMoOZsi3tjAt5fPGKki28atFADfAroq2UefoBd vIO0VfhgYtlEzEcIsvqjelidoecsBgFVqIKyTAI8C+rsX5SwiZgDvfYhYsllJKKS 7xgZ9rbudgrxyDR7ZMJP3inOSn/KIeUQKkrOXttwgM2x5w8KNqQh1CAT0shID71/ 67iydb4uT41yQFsAJ1arR8Ke4ppOiRK24myY50yN7NOpZvVpSzzNjh5dJyWABOwp tQIDAQAB -----END PUBLIC KEY-----
Other variants
  • Guer Ransomware (.guer encrypted files)
  • Aeur Ransomware (.aeur encrypted files)
  • Moqs Ransomware (.moqs encrypted files)
  • NOOA Virus Removal Tool

    What is Nooa?

    Discovering files with the .nooa extension and _readme.txt notes scattered across various folders is a telltale sign of infection with the Nooa ransomware. This malware is designed to encrypt files on the victim's computer before demanding a ransom. Decrypting these files without specific tools is generally considered impossible.

    The Nooa virus, like others in the STOP/Djvu ransomware family, employs the Salsa20 encryption algorithm, which boasts an astronomical number of potential decryption keys, making brute-force attempts futile. The use of quantum computing wouldn't significantly reduce the decryption time, possibly outlasting the Earth's lifespan. However, there's a glimmer of hope as certain specialized decryption tools can potentially restore your files within hours.

    Nooa ransomware is primarily distributed through third-party websites that tempt users with free access to paid programs or through the use of various dubious tools. Hackers who circumvent program licensing inject malicious codeโ€”or even the entire virusโ€”into their "products," with malware developers compensating them for these actions.

    Dubious tools, designed for illegal activities such as generating license keys for software or activating Windows unlawfully, are particularly susceptible to misuse for distributing malware. Since antivirus solutions typically flag such tools, perpetrators often advise disabling security software or whitelisting the hacking tool. Regrettably, the malicious intent becomes apparent only after the damage is done.

    Nooa Encryption process

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

    .NOOA 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 Nooa 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.

    Nooa note:

    Ransom note is the same for the whole STOP/DJVU 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-CnI3tI6Ktv
    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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    Indicators of Compromise(IOC)

    File NameMD5File Size
    ๐Ÿ“œ SAMPLE.EXE065ded19e649ffc4b5392da5191bc3ba740352
    ๐Ÿ“œ SAMPLE.EXE0c8429838d52aeed7c71fbee159cdd7f774656
    ๐Ÿ“œ SAMPLE.EXE157c590d88f0edb6456d138e15529e85761344
    ๐Ÿ“œ SAMPLE.EXE11f5960ea7de49e5b29a775e3a0f1782743424
    ๐Ÿ“œ SAMPLE.EXE1ee165954e9e2c13d886a1e01140039d775680
    ๐Ÿ“œ SAMPLE.EXE133f6d59b0922074f34b85cc18e5fc8c818688
    ๐Ÿ“œ SAMPLE.EXE1a105590a6c15d74d8e91cb1e68befc8741376
    ๐Ÿ“œ SAMPLE.EXE1c0fd074a2964875ad2be22c3488cfb0760832
    ๐Ÿ“œ SAMPLE.EXE40d14a8dbac0e0f89300a160fa951f1a761344
    ๐Ÿ“œ SAMPLE.EXE41a4ab8138b56a4f672b5ea9137d2a8d863744