Ooza Virus Ransomware (.ooza File)

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

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About Ooza Ransomware:

NameOoza Virus
File Extension.ooza
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Offline IDdhL6XvokZotUzL67Na5WfNIBufODsob7eYc3mzt1
Last seenSeptember 17, 2023
AlgorithmSalsa20 encryption. If Ooza 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 .ooza files in the future.
RansomFrom $490 to $980 (in Bitcoins)
  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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAx5BqeWGwHmcgjbaAsjpD e0AigrNBuYmLeDVLdZ2BSdUhga7JxmwSkPWdR7uDfOKDwKLU2vv7mTJJVikE+ED0 eCw+Q//sV4bVB9qDUObno0M1HcM5y3YFJAeuCt85e3JQQnYQHhN6mlCPFd1vVZAn C2XeDNWQ5XcJwp8lRV2k4s0CONrM2rH909N5+Yj7RahvCKAzzEbUhW6VFZK9j3oA 5eLARM40VO2pZLPkUYGcjGvY+DiUmScoa10O46NlMaCqEQUM58dMHqpifpYcVrOD o+076RFizmwG6CL3BZR+1Tt8CcC1WHyfam0v1m2QTRSuVD0RQFlV4/ZCNcBupGin 4wIDAQAB -----END PUBLIC KEY-----
Other variants
  • Oohu Ransomware (.oohu encrypted files)
  • Oopl Ransomware (.oopl encrypted files)
  • Hgml Ransomware (.hgml encrypted files)
  • Ooza Virus Ransomware (.ooza) File - How does it work?

    What is Ooza ransomware?

    Infecting the system with Ooza ransomware is a case with very dangerous consequences. This virus makes various changes in your system settings, which make your system much harder to use. Of course, besides the settings altering, the malware also encrypts your files, so you cannot open them in any way.

    The encryption algorithm used by Ooza ransomware is Salsa20. It is typical for all STOP/Djvu ransomware (Ooza belongs to that “family”). Decrypting tools allow you to get your files back without payment, but the things also depend on random. If your files are ciphered with the offline key - you have a big chance of getting your files back. However, the online encryption key usually means that decryption is impossible.

    The best way to deal with ransomware attacks is to prevent them. Usually, Ooza ransomware is spread inside the programs you get on dubious sites. Although these apps are free, they must be purchased on the official website. Other programs are designed for some outlaw things - cheating, for example, or Windows activation. While making the program usable without any payments, hackers are free to add any malware into this program - depending on who paid the most.

    Encryption process

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

    .OOZA 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 Ooza 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]

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    🔗 HowToFix.Guide: How To Decrypt .ooza Files?

    Indicators of Compromise(IOC)

    File NameMD5File Size
    📜 SAMPLE.EXEabaa4587b85e760466b091d5af706f1b732160
    📜 SAMPLE.EXE14eb924173d295a95b143f409fd3bfcc731648
    📜 SAMPLE.EXE9a96d0e2f9c295ab676be283a7e93565221184
    📜 SAMPLE.EXE29e090fba1a98d72c74fdcd0f23a7c9e722432
    📜 SAMPLE.EXE1bdce20942396cef32c2db8e99374c0d154185
    📜 SAMPLE.EXE1c477fde7fdce077a7e270b36cb8cdd1211456
    📜 SAMPLE.EXE4ef02166db3ff50cba91bf22374bb9ac697344
    📜 SAMPLE.EXEfda703fefcaf516cf0987899b39514bf151584
    📜 SAMPLE.EXE49b904e73ee16058ca948bf728febd94722944
    📜 SAMPLE.EXEeb8a0736eb3ed60475a86bb77cc95c17305152