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NOOS Ransomware (.noos File Extension)

NOOS 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 Noos:


NameNoos Virus
Version0168
File Extension.noos
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Note_readme.txt
Offline IDQIho6jTmFxipRZsiUi4sllWKgMOV2pWgbnnlJAt1
Last seenJuly 24, 2022
AlgorithmSalsa20 encryption. If Noos 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 .noos files in the future.
RansomFrom $490 to $980 (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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4gLbXBCCb49q8+gs3AnB ZXAF2eO9ifiln3oP3S04W0swzqrU7yoqZbbGynD6wXmRdteqid4kmlm1WVVMo7sR DmUb77ClIAaSR9qDTCDNuexG843uftCf1z1mY23sCH0kdIXbXYa+2ItNTAJ2O8bJ ThIHkHIOgnFZFNEJ69q5Ovjdp8KMbDA1lTLFnU+Zs7sFpvInmBc52DUHbJLzYYIQ jQwSBikcqXHqzsbja36IlSF8pJ9SGLM2Acbgc/4/KC5gPICD6eb9a6y04ihRWXiT HLA2dLVk9VYLzzEyx1bHALOvPuo731WHwWG78afBsKFwG8eKTWc3Gly0a2BQCbN3 hwIDAQAB -----END PUBLIC KEY-----
Other variants
  • Boot Ransomware (.boot encrypted files)
  • Qual Ransomware (.qual encrypted files)
  • Waqa Ransomware (.waqa encrypted files)
  • NOOS Virus Removal Tool

    What is Noos?

    Noos ransomware exemplifies a "classic" ransomware infection. This virus infiltrates your PC, encrypts your files, and then demands payment for decryption. The average ransom amount is $980, accompanied by threats of permanent file deletion or non-decryption if payment isn't made. Crucially, it also modifies numerous system settings.

    The malware changes your system's configurations to weaken defenses and hinder early virus detection efforts. It specifically deactivates Microsoft Defender and obstructs the installation of antivirus software. These alterations not only compromise your security but also affect your ability to install other software and must be promptly reversed.

    Noos ransomware employs the Salsa20 encryption algorithm, a common choice among the STOP/Djvu ransomware family. The strength of this cipher, with 1.158x10^77 (a 78-digit number) possible decryption keys, makes conventional hacking attempts futile. Brute-forcing this encryption would take over two unvigintillion years, highlighting the impracticality of such an approach for recovery.

    Noos Encryption process

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

    .NOOS 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 Noos 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.

    Noos 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 photos, 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-iBpEhjntw2
    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
    📜 SAMPLE.EXE4097c60358900c87e05ad015ef270e181220608