Remove Nasoh Ransomware

By | Posted on August 14, 2019 |

Nasoh ransomware is a deadly form of computer virus that was tasked primarily to lock important files. It keeps the files on this inaccessible condition until the owner pays the costly ransomware price demanded by malware authors. It is clear that ultimate goal of Nasoh ransomware is to extort money from victims and like its predecessors from STOP malware family, the ransom note stipulated that $980 is required in exchange for the private key and decryption software.

Because Nasoh is just a remake of ransomware from the said clan, its slight difference from previous versions concerns only the appended file name, which is .nasoh extension. In this case, file photo.jpg will turn into photo.jpg.nasoh after it was fully encrypted by the virus.

Keep in mind that infiltration by Nasoh ransomware is not only concentrated on the complex decryption process applied to majority of computer files. Prior to this major task, Nasoh virus have already infected Windows system and planted several malicious executable files on various system folders and registries. While these harmful objects exist, it will continue to harass newly added files on the computer.

Nasoh Ransomware

Loosing vital data is a disaster and with this type of infection, the legitimate and free recovery tool may not come sooner. Though, victims who are fortunate to have an offline key on their .nasoh files may have great chances of recovery using the StopDecrypter tool. But if files were encrypted with the keys obtained from a command-and-control server (online), restoring it may be impossible due to highly complex cipher that requires a combination of private key and decryption tool, which attacker currently holds.

Paying the ransom money does not guaranteed that people behind Nasoh ransomware will provide the necessary tools. Much more, even if they did send it, no assurance is given that it can fully restore all encrypted files especially large files that are far more difficult to restore.

How to Remove Nasoh Ransomware

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Nasoh 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 Nasoh ransomware.

7. Finally, click on Start Scan begin checking the computer for malware and similar threats.

MBAM-threatscan

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 Nasoh’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)

download-msrt

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 Nasoh ransomware. Another option is to browse the location folder and double click on the file to run.

msrt-icon

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.

msrt1

5. Next, you will see Scan Type. Please choose Full Scan to ensure that all Nasoh 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.

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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.

msrt3

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 Nasoh ransomware have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.

Stage 3 : Unlocking files with Nasoh Decryption Tool

So far, this Nasoh 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.

For additional information (download link, supported versions, instructions) about StopDecrypter, please proceed to ransomware decryption tool archive page.

If you received a message stating that “No keys were found for the following IDs (.nasoh)”, please copy and submit the information to the official download page to include your information (log file) and have it archive in case decryption software becomes available.

StopDecrypter Information

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 Nasoh 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 Nasoh 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 Nasoh 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 Nasoh ransomware infection.

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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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