How to remove Nuis ransomware

Nuis ransomware is the threat coming after almost 600 other variants

Nuis ransomware virus is the encryption threat that locates the most used files on the machine and relies on methods allowing it to improve persistence. The infection can demand money in exchange for the decryption tool, so the victim thinks that this payment is the only solution for the infection.

Nuis file virus changes the original code of the file, which can be valuable for the victim. Documents, images, audio, and video files can all get encrypted by this threat.^[1] These infections can even damage archives and backups, but system files that control processes or programs get damaged differently, not during the encryption. 

Ransomware infections can damage the system further while the encryption algorithms run to lock data (later, files are marked with .nuis appendix). Once these processes are done, the infection can demand payments via the ransom note placed in various folders as the _readme.txt file.

These threats that infiltrate machines silently can run various processes and do that immediately after the infection. The ransomware might cause all the changes and still show no symptoms to the victim, so the file-locking and marking appear out of nowhere when the Nuis ransomware demands nearly a thousand dollars for the possible decryption.

However, this is the infection coming from the STOP virus/Djvu ransomware family that is not decryptable at this time. The infection is advanced and improved, so researchers have no time or resources to come up with decryption tools for each weekly release of variants. This is the piece that comes after other versions but is not changed as other variants released after 2019.

Since Nuis file virus is not decryptable and official tools do not exist, there are limited options for this threat removal and file recovery solutions. However, it might be possible to restore those affected files when you remove the infection properly first. There are alternate methods for paying the ransom, for sure.

Encryption possibilities

Nuis file virus comes after Towz and Powz, Tohj, Pohj versions were released a few weeks back. These releases are weekly, and the only thing that is changed with new versions is the file appendix. The ransom note, the demanded sums from victims, and even contact emails are not altered for years already.

All these versions released after the major improvements in 2019 cannot be decrypted easily. The advanced coding methods allow the Nuis ransomware virus and other versions to use online IDs and make decryption keys unique for each of the devices.

It means that any threat victims cannot easily recover those encoded files when the decryption key is not obtained. That could be possible with the decryption tools provided by the criminals, but there is no need to contact criminals that do not care bout your files.

Nuis ransomware decryption is very limited and might not be possible, but you can try to achieve a full recovery with the tool developed for the earlier versions. It is important to mention that this tool will not work for everyone – it only works if data is locked with an offline ID due to malware failing to communicate with its remote servers.

Even if your case meets this condition, somebody from the victims has to pay criminals, retrieve an offline key, and then share it with security researchers at Emsisoft. As a result, you might not be able to restore the encrypted files immediately. Thus, if the decryptor says your data was locked with an offline ID but cannot be recovered currently, you should try later. You also need to upload a set of files – one encrypted and a healthy one to the company's servers before you proceed.

• Download the app from the official Emsisoft website.
• After pressing Download button, a small pop-up at the bottom, titled decrypt_STOPDjvu.exe should show up – click it.
  
• If User Account Control (UAC) message shows up, press Yes.
• Agree to License Terms by pressing Yes.
  
  
• After Disclaimer shows up, press OK.
• The tool should automatically populate the affected folders, although you can also do it by pressing Add folder at the bottom.
  
• Press Decrypt.
  
  

From here, there are three available outcomes:

1. “Decrypted!” will be shown under files that were decrypted successfully – they are now usable again.
2. “Error: Unable to decrypt file with ID:” means that the keys for this version of the virus have not yet been retrieved, so you should try later.
3. “This ID appears to be an online ID, decryption is impossible” – you are unable to decrypt files with this tool.

Removal of the ransomware

Nuis ransomware removal is a process that requires particular tools and help because the threat is helped by other infections running on the machine. These tools, like anti-malware programs and applications running on proper AV detection^[3] engines, can properly terminate the virus.

These applications that can check the machine fully can indicate potentially malicious files and damaging pieces running on the machine. The infection can be removed quickly once those files are located and indicated as dangerous. Remove this dangerous Nuis ransomware by running the full system scan on your device.

Applications like SpyHunterCombo Cleaner or MalwarebytesMalwarebytes can help to check the machine and remove all pieces related to the infection and even trojans or malware pieces added to the system to improve the persistence of this ransomware. You can terminate the infection properly and make sure that the Nuis file virus is no longer running on the system.

If the threat is active when you put copies of encrypted files on the system, the threat can easily run a second round of file-locking and permanently damage your files, so there are no backups that could be used to restore files affected by the program. This is one of the most dangerous threats, so remove the infection and then worry about the consequences caused by ransomware.

However, do not forget to note that infection removal is not the same as decryption of the virus or can help recover files damaged by the virus. This is the most important step because the infection cannot be active when you deal with damage to your system or lost files. Remove all infections and then deal with Nuis ransomware leftovers.

Recovery of the system data

The threat is capable of damaging more parts of the machine than the common data. Once a system file is damaged by malware, antivirus software is not capable of doing anything about it, leaving it just the way it is. Consequently, users might experience performance, stability, and usability issues, to the point where a full Windows reinstall is required.

Therefore, we highly recommend using a one-of-a-kind, patented technology of FortectIntego repair. Not only can it fix virus damage after the infection, but it is also capable of removing malware that has already broken into the system thanks to several engines used by the program. Besides, the application is also capable of fixing various Windows-related issues that are not caused by malware infections, for example, Blue Screen errors, freezes, registry errors, damaged DLLs, etc.

• Download the application by clicking on the link above
• Click on the ReimageRepair.exe
  
  
• If User Account Control (UAC) shows up, select Yes
• Press Install and wait till the program finishes the installation process
• The analysis of your machine will begin immediately
• Once complete, check the results – they will be listed in the Summary
• You can now click on each of the issues and fix them manually
• If you see many problems that you find difficult to fix, we recommend you purchase the license and fix them automatically.