Moresa ransomware virus is another threat from STOP/DJVU malware family. It has been in the wild for a while and actively attacking thousands of computer systems globally. The threat is utilizing the same distribution tactics as other older variants and is taking advantage of connected network via internet.
The most effortless method for cyber criminals to spread Moresa is via spam email campaign. Via this scheme, the virus is attached to email messages and masquerades as important docs, spreadsheet, or any bogus data with attractive filename. The sender often disguise as prominent company or organization communicating to target as if there is an urgent matter and convincing them to open the attachment as soon as possible.
Unknown to user, the attached file is in executable format and opening it will permit Moresa malware to communicate to remote server to download additional files, each with distinctive role. It can download and execute file that disables local security application to avoid detection. There is also one associated executable file that was assigned to block user’s access to security website, prevent them from seeking technical support, and avert the downloading of decryption tool.
The focal point of Moresa ransomware attack is to encrypt selected files on the computer and append each with .moresa extension. This action does not only disassociate the file to installed application but also render it useless. Victims who require to restore .moresa infected files must follow the instruction on generated “readme.txt” ransom note that can be found on the same directory as the infected data. As stated in the content, victim must purchase the unique key and decryption tool as the only solution in recovering all Moresa infected files.
Tampering the encrypted files may permanently render it useless, and speculating for the right decryption key is practically impossible. Restoring everything from backup is the only cost-less sure way to regain access to encrypted files but this may not be probable to most victims who do not perform the routine. Alternatively, victims may utilize STOPDecrypter tool as stated below.
How to Remove Moresa Ransomware
Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Moresa 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 MB3-Setup-[version].exe.
3. Carry out the installation with default setup process.
4. At the last stage of installation process, click the Finish button. The program should launch momentarily.
5. On Malwarebytes Anti-Malware console, select Scan from the menu to see available Scan Method.
6. Next, click on Threat Scan. This is the most complete scan method that will surely find any hidden malicious objects associated to Moresa ransomware.
7. Finally, click on Start Scan begin checking the computer for malware and similar threats.
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 Moresa’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 Moresa. 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 Moresa 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 Moresa have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.
Stage 3 : Unlocking files with Moresa Decryption Tool
So far, this Moresa decryption tool works only for files that were encrypted using offline keys. This happens sometimes if the virus is unable to communicate to remote server to obtain unique keys; instead, it will use offline keys when encrypting files. However, there is a little chance of recovering files using this tool due to limited available offline keys that were integrated with this decryption tool. You may download StopDecrypter (by Demoslay335) from this website.
If you received a message stating that “No keys were found for the following IDs (.Moresa)“, please copy and submit the information to the same website to include your ID on the next update of the decryption tool.
We will update this section once the full decryption tool is on hand. In the meantime, please try other 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 Moresa virus 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 Moresa
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 Moresa.
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 Moresa 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.