Remove Ooss Ransomware (Decrypt .ooss Files)

By CK Quinito | Posted on February 19, 2020 |

Ooss is a ransomware that attacks and scans though computers locating valuable files or documents of targeted users. Tracked data will be encrypted by Ooss ransomware using their strong algorithm and locks it to be inaccessible. The only way to recover files is settling the ransom fee or purchasing a decryption tool, which is only provided by Ooss developers.

Just like any other ransomware, Ooss execute their operations in order to ask or demand a ransom fee. It infect the files that is most likely important and valuable for computer users in able to force them into purchasing a decryption tool for recovering .ooss corrupted files.

It has been easy to distinguish if the files are infected by Ooss ransomware. Developers often change the current name of the data into .ooss file extension. For example, the clean file document.doc will become document.doc.ooss once encrypted. Moreover, victims will no longer access the infected files unless a decryption tool is obtained.

Then, Ooss developers will drop a note to victims within the text file named “_readme.txt”. It contains the ransom message including instructions and demands of hackers in order for users to recover their precious files. On every attack of this DJVU malware, attackers are offering a 50% discount, so victims are only required to settle $490 instead of the $980 fee. However, it will depend on how soon their victims will contact them. The discount will only be applicable if they reach Ooss operators within 72 hours.

Ooss developers will instruct its victims to send an email to provided contact address. Ooss developers suggests to attach one infected file that they are willing to decrypt free of charge. After proving that the recovery is possible, decryption tool will be sent to victims once the payment is settled. Data-locker criminals often use crypto-currencies on their transactions.

This is how Ooss ransomware operates just to generate income from their prospect targets. Ooss developers spread through computers by sending spam email campaigns having attachments that might get the attention of target victims. Ooss ransomware typically use topics or matters about money, banking, or promotions, which ought the users to click and open attachments. Nevertheless, the truth is, the file attached to the mail is malware-infected.

How to Remove Ooss Ransomware

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Ooss virus. Aside from our suggested tool, you may also run your own security program.

Though affected files may be impossible to decrypt due to complexity of the encryption, you can still try recovery method like alternative tool, Shadow Explorer or Previous Version as described below.

Stage 1: Scan the Computer with Anti-Malware Tool

1. Download free anti-malware scanner called MalwareBytes Anti-Malware.
Malwarebytes Anti-Malware Download Link (this will open a new window)

2. After downloading, install the program. It may run automatically or you have to double-click on the downloaded file MBSetup.exe.

3. Carry out the installation with default setup process.

4. After the installation process, click the Get Started button to launch the program.

5. Continue with the prompts until the main program opens.

6. On the main console, click on Scan to run most complete detection method to find hidden objects associated to Ooss ransomware.

7. Scanning may take a while. Please wait until the anti-malware tool is done with the checking.


8. Once the scan has completed, the tool will display the list of detected threats. Remove all identified malicious items and restart the computer if necessary.

Stage 2: Double-check for Ooss’s leftover with Microsoft’s Malicious Software Removal Tool

1. Download the free scanner called Malicious Software Removal Tool.
Malicious Software Removal Tool Download Link (this will open a new window)


2. The tool automatically checks the operating system and suggest appropriate download version. Click on Download button to begin. Save the file to a convenient location, preferably on Desktop.

3. After downloading the file, Windows will prompt that download has completed. Click Run to start scanning for Ooss ransomware. Another option is to browse the location folder and double click on the file to run.


4. The tool will display Welcome screen, click Next. Please note the message “This tool is not a replacement for an antivirus product.” You must understand that this program is made specifically to find and remove malware, viruses, Trojans, and other harmful elements on the computer. It was not designed to protect the computer.


5. Next, you will see Scan Type. Please choose Full Scan to ensure that all Ooss ransom virus entities and other harmful files left on the computer will be found and removed. For advanced computer user, you can opt for Customized Scan, if there are other drives or folders you wanted to include in this scan.


6. Full scan may take a while, please wait for Malicious Software Removal Tool to complete the tasks. However, you may cancel the scan anytime by clicking on the Cancel button.


7. After scanning, the tool will reveal all identified threats. There may be other threats that our first scan fails to detect. Please remove/delete all detected items.

8. When removal procedure is complete, you may now close Malicious Software Removal Tool. We hope that Ooss ransomware have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.

Stage 3 : Unlocking files with Ooss Decryption Tool

Tools that may decrypt files infected by Ooss is not yet available at this time. We will update this section once the tool is on hand. In the meantime, please try the options below.

Option 1: Windows Previous Version Tool

Windows Vista and Windows 7 have a feature called Previous Versions. However, this tool is only usable if restore point was made prior to Ooss ransomware infection. To use this tool and recover files affected by the virus, please follow these steps:

1. Open My Computer or Windows Explorer.

2. Right-click on the affected files or folders. From the drop-down list, please click on Restore previous versions.

3. New window will open display all backup copy of files and folders you wanted to recover. Choose the appropriate file and click on Open, Copy, or Restore. Restoring selected files overwrites the current encrypted files on the computer.

Option 2: Use ShadowExplorer to restore files encrypted by Ooss Ransomware

Just like Previous Version tool, ShadowExplorer is taking advantage of shadow copy created by Windows. This tool allows you to retrieve older version of files before it was encrypted by Ooss ransomware.

1. Download ShadowExplorer from the official web site.

2. Install the program with the default settings.

3. The program should run automatically after installation. If not, double-click on ShadowExplorer icon.

4. You can see the drop-down list on top of the console. Please select proper drive and the most recent point-in-time shadow copies of files you wish to restore prior to Ooss ransomware infection.


5. Right-click on the Drive, Folder, or File you wish to restore and click Export…

6. Lastly, ShadowExplorer will prompt for location where you want to save the copy of recovered files.

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