The Ooza virus, also known as ransomware, belongs to the STOP family. This malware family is notorious for malicious file ciphering. Once the Ooza virus infects a computer, it scans the system for files like videos, photos, documents, and more. It modifies the file structure and appends the “.ooza” extension to each encrypted file, making them unusable without the decryption key.
Ooza Virus Overview
🤔 Ooza virus can be classified as ransomware that belongs to the DJVU/STOP ransomware family. Its primary purpose is to lock all of your files it can reach. After that ransomware virus asks to pay the ransom – ($490 – $980) in Bitcoin.
The Ooza virus is a malware type that encrypts your files and forces you to pay for their decryption. This ransomware ciphers different file types. Encrypted files can be identified by a distinct “.ooza” extension. The files touched by ransomware become impossible to access and use.
Then, the ransomware asks for a ransom payment in Bitcoin from the victims, which ranges from $490 to $980, depending on the time passed after the attack. Usually, a ransom text file is named as “_readme.txt“.
Ooza Ransomware works with Salsa20 encryption algorithms to cipher the targeted files. Since the Ooza virus employs such a robust encryption method, it becomes quite hard, if even possible, to pick the decryption key without the assistance of the attackers.
Once Ooza malware finishes the encryption, it shows a ransom note to the user, demanding a ransom payment for the decryption key. The ransom note provides instructions on how to pay off the bill and also often includes threats of data loss or ransom amounts surge if the ransom is not paid within a specified timeframe.
I have created a comprehensive list of potential solutions, tips, and practices to remove the Ooza malware and recover your files. There are situations when it may be feasible to restore your files, but sometimes, it may be impossible.
📌 Important Note!
It is essential to voice that paying off the ransom is not a guarantee of the successful recovery of your files. The crooks behind the Ooza virus are not trustworthy. There were the cases where victims have paid the ransom, only to be denied by the cyber criminals with the decryption key provision.
Ooza uses a unique key for every victim, with one exception:
- If Ooza fails to connect the command and control server (C2) before starting the encryption process, it uses offline keys. An offline key is not unique and is the same for all users, which allows for the decryption of files encrypted by the ransomware.
The Ooza virus bears resemblance to other DJVU ransomware samples like Hgew, Hgfu, Hgkd, and Hgml. This virus encrypts a wide range of common file types and appends its distinct “.ooza” extension to all files. For instance, a file named “1.jpg” would be altered to “1.jpg.ooza” and “2.png” to “2.png.ooza“.
After successful encryption, malware spawns a special text file named “_readme.txt” and places it in every folder containing the encrypted files. It also adds this file to the desktop, so the victim will not miss its appearance even without opening folders.
The image below provides a visual representation of files with the “ooza” extension:
|Ransomware family1||DJVU/STOP2 ransomware|
|Ransom||From $490 to $980 (in Bitcoins)|
|Contact||[email protected], [email protected]|
|Detection||TrojanDropper:Win32/Agent.UM Virus Removal, Trojan:Win32/Gepys.DSB!MTB Virus Removal, Trojan-Ransom.Win32.Crypren Virus Removal|
To remove possible malware infections, scan your PC:
6-day free trial available.
This message asking payment is for restore files via decryption key:
Ooza ransomware arrives as a set of operations that are used to carry out different activities on a victim’s computer. One of the primary ones being launched is winupdate.exe, a sneaky process that displays a false Windows update prompt during the attack. Such a trick helps to convince the victim that their PC has become slow because of a Windows update.
Meanwhile, the ransomware runs another process (which name commonly consists of 4 random characters) which initiates scanning the computer for target files and ciphering them. Next, the ransomware removes Volume Shadow Copies from the system by the following CMD command:
vssadmin.exe Delete Shadows /All /Quiet
Once removed, it becomes impossible to recover the previous computer state using System Restore Points. The issue is, ransomware operators are getting rid of any built-in Windows techniques that could assist the victim to restore files for free. In addition, the rascals modify the Windows HOSTS file by including a list of domains to it and mapping them to the localhost IP. As a result, the victim will see a DNS_PROBE_FINISHED_NXDOMAIN error when accessing one of the blocked websites.
We’ve observed that ransomware tries to restrict websites that developed various how-to guides for computer users. It is evident that by hindering specific domains, the malefactors are seeking to hinder the victim from accessing relevant and helpful ransomware-attack-related information online. The virus also saves two .txt files on the victim’s computer that offer particulars related to the attack – the victim’s public key and personal ID. These two files are named bowsakkdestx.txt and PersonalID.txt.
After all these changes, the malware doesn’t cease. Variants of STOP/DJVU tend to release Vidar password-stealing Trojan on compromised systems. This threat has an huge list of capabilities, including:
- Infiltrating the victim’s computer with malware and executing it to gain unauthorized access.
- Obtaining unauthorized access to login credentials of Steam, Telegram, and Skype.
- Manipulating and viewing files on the victim’s computer without their knowledge.
- Stealing cryptocurrency wallets from the victim’s system.
- Granting the hackers remote control over the victim’s computer for various malicious activities.
- Extracting sensitive information such as browser cookies, saved passwords, and browsing history.
The cryptography algorithm in STOP/Djvu ransomware is AES-256. So, if your data got encrypted with an online decryption key, the possibility to get your files back are quite low. Thing is, this key is unique for each victim, and brute forcing it will take exceptionally big amount of time.
Obtaining the online key in any other way is also close to impossible. It is kept on a remote server controlled by the criminals who promote the Ooza malware. For receiving unlocking key the payment should be $980. To see the payment details, the victims should contact the hackers by email ([email protected]).
The message by the ransomware states the following information:
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-WJa63R98Ku 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] Your personal ID: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Do not pay the ransom!
Please, try to use the available backups, or Decrypter tool
The _readme.txt document also demands that the computer owner must get in touch with the hackers during 72 hours since the file encryption. If user contacts hackers within 72 hours, hackers grant a 50% discount. Thus the ransom amount will be minimized down to $490.
Yet, stay away from paying off the ransom! I highly recommend that you do not contact these scammers and do not pay. An efficient solution to retrieve the lost data is just using the available backups, or using Decrypter tool from Emsisoft.
The peculiarity of such malware is the utilization a similar set of actions for generating the unique decryption key to recover the ciphered data. Thus, unless the ransomware is still in development or has some hard-to-track flaws, manual data recovery is a thing you can’t perform. The sole remedy to prevent the loss of your valuable data is to regularly make backups of your important files.
Keep in mind that even if you do preserve such backups regularly, they must be located into a specific location without loitering, not being connected to your main workstation. For instance, the backup may be kept on the USB flash drive or some substitute external hard drive storage. Alternatively, you may turn to the help of online (cloud) information storage.
Needless to say, when you maintain your backup data on your regular device, it may be ciphered together with other data. For this reason, placing the backup on your disk is surely not a wise idea.
How I was infected?
Ransomware has a various methods to built into your system. But it doesn’t really matter what way had place in your case.
Ransomware attack following a successful phishing attempt.
Nevertheless, these common leaks may inject it into your PC:
- The virus may be discreetly distributed by utilizing online free hosting resources.
- The virus installer may be disguised within other apps, particularly utilities offered as freeware or shareware.
- The virus may propagate through spam emails containing dubious links leading to the installation.
- Hidden malware may be included in pirated software downloaded from illegal peer-to-peer (P2P) resources.
In some cases, the Ooza virus hides as a legitimate procedure, for example, in messages requesting a browser update or a needed codec for online media playback. Some online frauds use this method to force you into manually deploying the ransomware by making you directly engage in the process.
Surely, the fraudulent update alert will not disclose that you are installing the threat. This installation will be concealed under an alert stating that you must install an urgent security update or some dubious program.
Without a doubt, software cracks also pose a threat. Using P2P is both illegal and may result in the introduction of severe malware, including the Ooza ransomware.
To sum up, what can you do to avoid the ransomware from penetrating your computer? Even though there is no 100% guarantee to prevent your PC from getting compromised, there are certain tips I want to give you to prevent the Ooza penetration. Be careful while using free software today.
Always ensure you read what the installer offers aside from the main free program. Stay away from running suspicious email attachments. Do not run files from unknown senders. Naturally, your current anti-malware program must always be updated.
The malware does not openly show itself. It will not appear in the list of your available programs. Instead, it will be masked under a malicious process running consistently in the background, starting the moment you launch your computer.
How To Remove Ransomware?
Remove Ooza Virus with Gridinsoft Anti-Malware
We have also been using this software on our systems ever since, and it has always been successful in detecting viruses. It has blocked the most common Ransomware as shown from our tests with the software, and we assure you that it can remove Ooza Virus as well as other malware hiding on your computer.
To use Gridinsoft for remove malicious threats, follow the steps below:
1. Begin by downloading Gridinsoft Anti-Malware, accessible via the blue button below or directly from the official website gridinsoft.com.
2.Once the Gridinsoft setup file (setup-gridinsoft-fix.exe) is downloaded, execute it by clicking on the file.
3.Follow the installation setup wizard's instructions diligently.
4. Access the "Scan Tab" on the application's start screen and launch a comprehensive "Full Scan" to examine your entire computer. This inclusive scan encompasses the memory, startup items, the registry, services, drivers, and all files, ensuring that it detects malware hidden in all possible locations.
Be patient, as the scan duration depends on the number of files and your computer's hardware capabilities. Use this time to relax or attend to other tasks.
5. Upon completion, Anti-Malware will present a detailed report containing all the detected malicious items and threats on your PC.
6. Select all the identified items from the report and confidently click the "Clean Now" button. This action will safely remove the malicious files from your computer, transferring them to the secure quarantine zone of the anti-malware program to prevent any further harmful actions.
8. If prompted, restart your computer to finalize the full system scan procedure. This step is crucial to ensure thorough removal of any remaining threats. After the restart, Gridinsoft Anti-Malware will open and display a message confirming the completion of the scan.
Remember Gridinsoft offers a 6-day free trial. This means you can take advantage of the trial period at no cost to experience the full benefits of the software and prevent any future malware infections on your system. Embrace this opportunity to fortify your computer's security without any financial commitment.
Trojan Killer for “Ooza Virus” removal on locked PC
In situations where it becomes impossible to download antivirus applications directly onto the infected computer due to malware blocking access to websites, an alternative solution is to utilize the Trojan Killer application.
There is a really little number of security tools that are able to be set up on the USB drives, and antiviruses that can do so in most cases require to obtain quite an expensive license. For this instance, I can recommend you to use another solution of GridinSoft - Trojan Killer Portable. It has a 14-days cost-free trial mode that offers the entire features of the paid version. This term will definitely be 100% enough to wipe malware out.
Trojan Killer is a valuable tool in your cybersecurity arsenal, helping you to effectively remove malware from infected computers. Now, we will walk you through the process of using Trojan Killer from a USB flash drive to scan and remove malware on an infected PC. Remember, always obtain permission to scan and remove malware from a computer that you do not own.
Step 1: Download & Install Trojan Killer on a Clean Computer:
1. Go to the official GridinSoft website (gridinsoft.com) and download Trojan Killer to a computer that is not infected.
2. Insert a USB flash drive into this computer.
3. Install Trojan Killer to the "removable drive" following the on-screen instructions.
4. Once the installation is complete, launch Trojan Killer.
Step 2: Update Signature Databases:
5. After launching Trojan Killer, ensure that your computer is connected to the Internet.
6. Click "Update" icon to download the latest signature databases, which will ensure the tool can detect the most recent threats.
Step 3: Scan the Infected PC:
7. Safely eject the USB flash drive from the clean computer.
8. Boot the infected computer to the Safe Mode.
9. Insert the USB flash drive.
10. Run tk.exe
11. Once the program is open, click on "Full Scan" to begin the malware scanning process.
Step 4: Remove Found Threats:
12. After the scan is complete, Trojan Killer will display a list of detected threats.
13. Click on "Cure PC!" to remove the identified malware from the infected PC.
14. Follow any additional on-screen prompts to complete the removal process.
Step 5: Restart Your Computer:
15. Once the threats are removed, click on "Restart PC" to reboot your computer.
16. Remove the USB flash drive from the infected computer.
Congratulations on effectively removing Ooza Virus and the concealed threats from your computer! You can now have peace of mind, knowing that they won't resurface again. Thanks to Gridinsoft's capabilities and commitment to cybersecurity, your system is now protected.
How To Decrypt .ooza Files?
How to restore big files?
Try removing .ooza extension on a few big files and opening them. This malware has issues with large files encryption. Either the virus accessed and did not encode the file, or it failed and did not add the filemarker. If you have files that are very large (2GB+), the latter is most likely. Please, let me know in comments if that will work for you.
As a outcome of the alterations made by the criminals, STOPDecrypter is no longer backed. It has been replaced with the Emsisoft Decryptor for STOP Djvu Ransomware developed by Emsisoft.
You can download free decryption tool here: Decryptor for STOP Djvu.
Download and run decryption tool.
Start downloading the decryption tool.
Make sure to launch the decryption utility as an administrator. You need to agree with the license terms that will come up. For this purpose, click on the “Yes” button:
As soon as you accept the license terms, the main decryptor user interface comes up:
Select folders for decryption.
Based on the default configurations, the decryptor will automatically choose the available directories in order to unlock the currently accessible drives (the connected ones), including the network drives. Additional (optional) locations can be selected with the aid of the “Add” button.
Decryptors typically offer several options depending on the specific malware family. The existing possible options are presented in the Options tab and can be turned on or disabled there. You may locate a comprehensive list of the currently active Options below.
Click on the “Decrypt” button.
As soon as you add all the desired locations for decryption into the list, click on the “Decrypt” button in order to initiate the decryption procedure.
Note that the main screen may turn you to a status view, letting you know of the active process and the decryption statistics of your data:
The decryptor will notify you as soon as the decryption procedure is completed. If you need the report for your personal papers, you can save it by choosing the “Save log” button. Note that it is also possible to copy it directly to your clipboard and to paste it into emails or messages here if you need to do so.
The Emsisoft Decryptor might display different messages after a failed attempt to restore your files:
✓ Error: Unable to decrypt file with ID: [your ID]
✓ No key for New Variant online ID: [your ID]
Notice: this ID appears to be an online ID, decryption is impossible
✓ Result: No key for new variant offline ID: [example ID]
This ID appears be an offline ID. Decryption may be possible in the future.
It can take a few weeks or months until the decryption key gets found and uploaded to the decryptor. Please follow updates regarding the decryptable DJVU versions here.
✓ Remote name could not be resolved
How to Restore .ooza Files?
In some case ransomware is not doom for your files…
The Ooza ransomware encryption mechanism algoritm is next: it ciphers every file byte-by-byte, then saves a file copy, removing (not overriding!) the original file. Hence, the information of the file location on the disk drive is lost, but the original file is not deleted from the drive. The cell, or the sector where this file was stored, can still contain this file, but it is not present in the file system and can be replaced by data that has been loaded to this drive after the deletion. Hence, it is possible to retrieve your files using special software.
Anyway, after realizing it was an online algorithm, it is impossible to retrieve my encrypted files. I also had my backup drive plugged in at the time of the virus, and this was also infected, or so I thought. Every folder within my backup drive had been infected and was encrypted. However, despite losing some important files, I retrieved almost 80% of my 2TB storage.
When I started going through the folders, I noticed the readme.txt ransom note in every folder. I opened some of the folders and found that all files that were not in a subfolder within that folder had been encrypted. However, I found a flaw and glimmer of hope when I went into the subfolders in other folders and found that these files had not been encrypted. Every folder within my c and d drives, including subfolders, had been encrypted, but this was not the case with the backup drive. Having subfolders created within a folder has saved 80% of my data.
As I said, I believe this to be only a small loophole on a backup drive. I’ve since found a further 10 % of my data on another hard drive on a different pc. So my advice is if you use a backup drive, create subfolders. I was lucky, I guess. But I was also unlucky that the virus hit as I was transferring some files from my backup.
Hopefully, this can help some other people in my situation.Jamie Newland
Recovering your files with PhotoRec
PhotoRec is an free program, which is originally created for files recovery from damaged disks, or for files recovery in case if they are unintentionally deleted. However, as time has gone by, this program received the ability to recover the files of 400 different file types. Hence, it can be used for file recovery after the Ooza attack.
First, you need to download this app. It is 100% free, but the developer states that there is no guarantee that the files will be recovered. PhotoRec is distributed together with another utility of the same developer – TestDisk. The downloaded archive will have TestDisk name, but don’t worry. PhotoRec files are right inside.
To open PhotoRec, you need to find and open “qphotorec_win.exe” file. No setup is needed – this program has all the files it need within the archive, hence, you can mount it on your USB drive, and help your friends/parents/anyone who has been attacked by Ooza ransomware.
After the start, you will observe the screen showing you the full list of your disks. However, this details are likely futile, because the required menu is placed a bit higher. Click this tab, then choose the disk which was attacked by ransomware.
After opting for the disk, you need to select the destination folder for the retrieved files. This menu is located at the lower part of the PhotoRec window. The best choice is to export them on USB drive or any other type of removable disk.
Then, you need to indicate the file formats. This choice is located at the bottom, too. As it was mentioned, PhotoRec can regain the files of about 400 different formats.
Finally, you can initiate files retrieval by pressing the “Search” button. You will see the screen where the results of the scan and recovery are shown.
Ooza files recovery Video Guide.
Frequently Asked Questions
🤔 How can I open “.ooza” files?
No way. These files are encrypted by ransomware. The contents of encrypted files are not available until they are decrypted.
🤔 Encrypted files contain important information. How can I decrypt them urgently?
If your data remained in the .ooza files are very valuable, then most likely you made a backup copy.
If not, then you can try to restore them through the system function – Restore Point.
All other methods will require patience.
🤔 You have advised using GridinSoft Anti-Malware to remove Ooza. Does this mean that the program will delete my encrypted files?
Of course not. Your encrypted files do not pose a threat to the computer. What happened has already happened.
You need GridinSoft Anti-Malware to remove active system infections. The virus that encrypted your files is most likely still active and periodically runs a test for the ability to encrypt even more files. Also, these viruses install keyloggers and backdoors for further malicious actions (for example, theft of passwords, credit cards) often.
🤔 This virus has blocked infected PC: I can’t get the activation code.
In this situation, you need to prepare the memory stick with a pre-installed Trojan Killer.
🤔 Decryptor did not decrypt all my files, or not all of them were decrypted. What should I do?
Have patience. You are infected with the new version of STOP/DJVU ransomware, and decryption keys have not yet been released. Follow the news on our website.
We will keep you posted on when new keys or new decryption programs appear.
🤔 What can I do right now?
The Ooza ransomware encrypts only the first 150KB of files. So MP3 files are rather large, some media players (Winamp for example) may be able to play the files, but – the first 3-5 seconds (the encrypted portion) will be missing.
You can try to find a copy of an original file that was encrypted:
- Files you downloaded from the Internet that were encrypted and you can download again to get the original.
- Pictures that you shared with family and friends that they can just send back to you.
- Photos that you uploaded on social media or cloud services like Carbonite, OneDrive, iDrive, Google Drive, etc
- Attachments in emails you sent or received and saved.
- Files on an older computer, flash drive, external drive, camera memory card, or iPhone where you transferred data to the infected computer.
If the guide doesn’t help you to remove infection, please download the GridinSoft Anti-Malware that I recommended. Do not forget to share your experience in solving the problem. Please leave a comment here! This can help other victims to understand they are not alone. And together we will find ways to deal with this issue.
How to Protect Your Computer from Ooza Ransomware
As cyber threats continue to evolve, ensuring the security of our computers has become more critical than ever. Malware, short for malicious software, poses a significant risk to our data, privacy, and overall online experience. Follow these simple guidelines to protect your computer:
- Install a Reliable Anti-Malware Solution: Having a robust anti-malware software is your first line of defense against cyber threats. Gridinsoft Anti-Malware is an industry-leading solution that offers real-time protection, thorough system scans, and automatic malware removal. Its constantly updated database ensures it can detect even the newest and most sophisticated threats.
- Keep Your Operating System and Software Updated: Regularly updating your operating system and software is crucial. Updates often include security patches that address vulnerabilities that cybercriminals may exploit. Enable automatic updates to ensure you stay protected.
- Exercise Caution with Email Attachments and Links: Malicious emails often contain infected attachments or links that lead to malware-infested websites. Avoid opening suspicious emails or clicking on unknown links. Be especially wary of emails that urge you to take immediate action or provide sensitive information.
- Use Strong Passwords and Enable Two-Factor Authentication: Strong, unique passwords are essential for protecting your online accounts. Enable two-factor authentication (2FA) whenever possible to add an extra layer of security.
- Avoid Sketchy Websites and Downloads: Stick to reputable websites for your downloads and avoid visiting suspicious or untrustworthy sites. Be cautious with free software downloads from unknown sources.
- Secure Your Network with a Firewall: A firewall acts as a barrier between your computer and the internet, monitoring and blocking unauthorized access. Ensure your firewall is active and properly configured.
Why Choose Gridinsoft Anti-Malware?
Gridinsoft Anti-Malware is a powerful and user-friendly solution designed to keep your computer safe from malware threats like a Ooza Ransomware. Here are some of the key features that make it an excellent choice:
- Comprehensive Malware Detection: Gridinsoft Anti-Malware uses advanced algorithms to detect and remove various types of malware, including the most evasive ones.
- Real-Time Protection: The software provides real-time protection, proactively blocking threats before they can harm your system.
- Regular Updates: Gridinsoft Anti-Malware's database is regularly updated to keep up with the latest malware trends and ensure maximum protection.
- User-Friendly Interface: The software is easy to use, making it suitable for both novice and experienced users.
- 24/7 Customer Support: Gridinsoft offers dedicated customer support to assist with any issues or questions you may have.
Securing your computer from malware is essential in today's digital landscape. By following best practices, such as installing a reliable anti-malware solution like Gridinsoft Anti-Malware, keeping your system up to date, and exercising caution online, you can significantly reduce the risk of falling victim to cyber threats. With Gridinsoft Anti-Malware's robust protection and user-friendly interface, you can enjoy peace of mind knowing your computer is safe and secure. Stay vigilant, stay protected!
Gridinsoft Anti-Malware is a powerful and reliable anti-malware software that provides comprehensive protection against all types of cyber threats. Don't wait for Ooza Ransomware to strike—take proactive steps to safeguard your computer today!
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How To Restore & Decrypt .OOZA Files?
Name: OOZA Ransomware
Description: The OOZA Virus belongs to the STOP/DJVU family of ransomware infections. This malicious software encrypts various file types, including videos, photos, and documents, which become identifiable by a distinct ooza extension. As a result, the affected files become inaccessible and unusable. Subsequently, the OOZA ransomware demands a ransom payment in Bitcoin from its victims, ranging from $490 to $980.
Operating System: Windows
Application Category: Virus
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