Nosu virus is the name given to a severe crypto infection that encrypts valuable files and requests a ransom for their recovery. As reported by security researchers this crypto virus is a strain of STOP ransomware. Once activated on a computer Nosu virus ransomware disrupts its system security and leaves it vulnerable to other malware attacks. In the unfortunate event that you are a victim of Nosu virus, you can find help in this removal guide.
Nosu Virus Files
The activation of Nosu ransomware virus on a computer system triggers an attack that passes through several phases. By triggering a long sequence of malicious operations the Nosu virus:
- Creates additional malicious files;
- Harvests certain details;
- Connects to a remote server;
- Transfers data;
- Encrypts personal files;
- Appends the extension .nosu to their names;
- Drops the ransom message _readme.txt;
- And extorts a ransom fee.
Since Nosu virus virus is designed to reach valuable personal files and encode them with the help of strong encryption algorithms such as AES and RSA, it prevents its victims from using encrypted files. At this point, a free decryption solution is not available. However, it may be possible to decrypt .Nosu files with the help of the free STOP ransomware decryption tool the moment security researchers update it to support this STOP variant.
Meanwhile, we advise all victims of Nosu ransomware virus to refrain from following the instructions they see in the ransom message _readme.txt
Continue reading this ransomware removal guide as it will show you how to remove malicious files from your infected system and how to possibly restore .Nosu files.
Threat Summary
| Name | Nosu |
| File Extension | .nosu |
| Type | Ransomware, Cryptovirus |
| Short Description | A malware that is designed to encrypt valuable files stored on infected computers so that it can extort a ransom fee from victims. |
| Symptoms | Important files are encrypted and renamed with the virus extension .nosu A ransom message forces victims to contact hackers in order to receive instructions on how to pay a ransom fee probably in cryptocurrency. |
| Ransom Demanding Note | _readme.txt |
| Distribution Method | Spam Emails; Email Attachments; Corrupted Websites; Software Installers |
| Detection Tool |
See If Your System Has Been Affected by malware
Download
Malware Removal Tool
|
User Experience | Join Our Forum to Discuss Nosu. |
| Data Recovery Tool | Windows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive. |
Nosu Ransomware – How does it infect PCs? What impacts does it cause?
Nosu virus is a data locker ransomware that has been reported to be a strain of one of the most prolific ransomware families called STOP/DJVU. Our team has the information that at the moment of writing this article, Nosu virus virus attack campaigns are active. The infection is aimed at the devices of online users worldwide.
Nosu virus still seems to have no progress as researchers are struggling to find a decryption for its online keys. For those who do not know, Nosu virus is a part of the ransomware virus family, called STOP/DJVU ransomware and it uses two types of keys to encrypt files – online and offline. If the key used on your files is online, it becomes significantly more difficult to decrypt files.
What are the techniques used for the spread of Nosu virus ransomware? They are likely to spam emails with malicious email attachments or links to corrupted websites, hacked web pages, and infected freeware installers. Like some of its recent predecessors Redl virus, Piny virus, and Mkos virus, Nosu virus is mainly spread via malware email spam campaigns. For the realization of malspam campaigns, cyber criminals usually embed malicious code in commonly used file types like documents and archives. Afterward, they attach modified files to emails accompanied by a message and a spoofed email address. So, when a user receives such an email it seems to be sent by a representative of legitimate service, business or institution.
The attack begins when the infection file of Nosu virus virus is executed on your system. As one of the most vicious malware infections Nosu virus performs lots of complex malicious activities that seriously disrupt system security.
All malicious operations aim one – to enable the ransomware to encrypt personal files without being interrupted. For the encryption phase, the virus launches a built-in cipher module with the help of which it scans folders for certain file types that are most likely to store personal data. Every time the module detects a target file, it applies changes that transform the original code of the file and locks it with the extension .Nosu virus.
As the main goal of this ransomware is to blackmail its victims to pay a ransom to hackers, it drops a ransom message with instructions on how to complete the payment process. The ransom message _readme.txt has the following contents:
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-7YSRbcuaMa
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:
Reserve e-mail address to contact us:
Your personal ID:
Of utmost importance is that victims keep calm and refrain from negotiating with cybercriminals. This action does not guarantee the recovery of your encrypted files.
At this point, Nosu virus virus is not decryptable with Emsisoft’s STOP Djvu Decryption tool. However, as soon as we notice security researchers’ announcement about an update that supports the decryption of this STOP ransomware variant we will update this article with information on how to decrypt files for free.
How to Remove Nosu Virus
The so-called Nosu virus is a threat with a highly complex code that disrupts system security in order to encrypt personal files. Hence the infected system could be used in a secure manner again only after the complete removal of all malicious files and objects created by the ransomware. That’s why it is recommendable that all steps presented in the ransomware removal guide below should be completed. Beware that the manual ransomware removal is suitable for more experienced computer users. If you don’t feel comfortable with the manual steps navigate to the automatic part of the guide.
How to Recover .nosu Files
There are several alternative methods that may be efficient for the recovery of .Nosu virus files, but note that there is no guarantee they would work. You could find them listed under Step 5 from our Nosu virus ransomware removal guide. Beware that you should make copies of all encrypted files and save them on a flash drive for example. This additional step will prevent the permanent loss of encrypted files.
Gergana Ivanova
Highly motivated writer with 5+ years of experience writing for ransomware, malware, adware, PUPs, and other cybersecurity-related issues. As a writer, I strive to create content that is based on thorough technical research. I find joy in the process of creating articles that are easy to understand, informative, and useful. Follow me on Twitter (@IRGergana) for the latest in the field of computer, mobile, and online security.
Follow Me:
- Step 1
- Step 2
- Step 3
- Step 4
- Step 5
Step 1: Scan for Nosu with SpyHunter Anti-Malware Tool
Ransomware Automatic Removal - Video Guide
Step 2: Uninstall Nosu and related malware from Windows
Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:
Follow the instructions above and you will successfully delete most unwanted and malicious programs.
Step 3: Clean any registries, created by Nosu on your computer.
The usually targeted registries of Windows machines are the following:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
You can access them by opening the Windows registry editor and deleting any values, created by Nosu there. This can happen by following the steps underneath:
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.
Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.
Step 4: Boot Your PC In Safe Mode to isolate and remove Nosu
Step 5: Try to Restore Files Encrypted by Nosu.
Method 1: Use STOP Decrypter by Emsisoft.
Not all variants of this ransomware can be decrypted for free, but we have added the decryptor used by researchers that is often updated with the variants which become eventually decrypted. You can try and decrypt your files using the instructions below, but if they do not work, then unfortunately your variant of the ransomware virus is not decryptable.
Follow the instructions below to use the Emsisoft decrypter and decrypt your files for free. You can download the Emsisoft decryption tool linked here and then follow the steps provided below:
1 Right-click on the decrypter and click on Run as Administrator as shown below:
2. Agree with the license terms:
3. Click on "Add Folder" and then add the folders where you want files decrypted as shown underneath:
4. Click on "Decrypt" and wait for your files to be decoded.
Note: Credit for the decryptor goes to Emsisoft researchers who have made the breakthrough with this virus.
Method 2: Use data recovery software
Ransomware infections and Nosu aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.
Simply click on the link and on the website menus on the top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.
Nosu-FAQ
What is Nosu Ransomware?
Nosu is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.
Many ransomware viruses use sophisticated encryption algorithms to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.
What Does Nosu Ransomware Do?
Ransomware in general is a malicious software that is designed to block access to your computer or files until a ransom is paid.
Ransomware viruses can also damage your system, corrupt data and delete files, resulting in the permanent loss of important files.
How Does Nosu Infect?
Via several ways.Nosu Ransomware infects computers by being sent via phishing emails, containing virus attachment. This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.
Another way you may become a victim of Nosu is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.
How to Open .Nosu files?
You can't without a decryptor. At this point, the .Nosu files are encrypted. You can only open them once they are decrypted using a specific decryption key for the particular algorithm.
What to Do If a Decryptor Does Not Work?
Do not panic, and backup the files. If a decryptor did not decrypt your .Nosu files successfully, then do not despair, because this virus is still new.
Can I Restore ".Nosu" Files?
Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Nosu files.
These methods are in no way 100% guaranteed that you will be able to get your files back. But if you have a backup, your chances of success are much greater.
How To Get Rid of Nosu Virus?
The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti-malware program.
It will scan for and locate Nosu ransomware and then remove it without causing any additional harm to your important .Nosu files.
Can I Report Ransomware to Authorities?
In case your computer got infected with a ransomware infection, you can report it to the local Police departments. It can help authorities worldwide track and determine the perpetrators behind the virus that has infected your computer.
Below, we have prepared a list with government websites, where you can file a report in case you are a victim of a cybercrime:
Cyber-security authorities, responsible for handling ransomware attack reports in different regions all over the world:
Germany - Offizielles Portal der deutschen Polizei
United States - IC3 Internet Crime Complaint Centre
United Kingdom - Action Fraud Police
France - Ministère de l'Intérieur
Italy - Polizia Di Stato
Spain - Policía Nacional
Netherlands - Politie
Poland - Policja
Portugal - Polícia Judiciária
Greece - Cyber Crime Unit (Hellenic Police)
India - Mumbai Police - CyberCrime Investigation Cell
Australia - Australian High Tech Crime Center
Reports may be responded to in different timeframes, depending on your local authorities.
Can You Stop Ransomware from Encrypting Your Files?
Yes, you can prevent ransomware. The best way to do this is to ensure your computer system is updated with the latest security patches, use a reputable anti-malware program and firewall, backup your important files frequently, and avoid clicking on malicious links or downloading unknown files.
Can Nosu Ransomware Steal Your Data?
Yes, in most cases ransomware will steal your information. It is a form of malware that steals data from a user's computer, encrypts it, and then demands a ransom in order to decrypt it.
In many cases, the malware authors or attackers will threaten to delete the data or publish it online unless the ransom is paid.
Can Ransomware Infect WiFi?
Yes, ransomware can infect WiFi networks, as malicious actors can use it to gain control of the network, steal confidential data, and lock out users. If a ransomware attack is successful, it could lead to a loss of service and/or data, and in some cases, financial losses.
Should I Pay Ransomware?
No, you should not pay ransomware extortionists. Paying them only encourages criminals and does not guarantee that the files or data will be restored. The better approach is to have a secure backup of important data and be vigilant about security in the first place.
What Happens If I Don't Pay Ransom?
If you don't pay the ransom, the hackers may still have access to your computer, data, or files and may continue to threaten to expose or delete them, or even use them to commit cybercrimes. In some cases, they may even continue to demand additional ransom payments.
Can a Ransomware Attack Be Detected?
Yes, ransomware can be detected. Anti-malware software and other advanced security tools can detect ransomware and alert the user when it is present on a machine.
It is important to stay up-to-date on the latest security measures and to keep security software updated to ensure ransomware can be detected and prevented.
Do Ransomware Criminals Get Caught?
Yes, ransomware criminals do get caught. Law enforcement agencies, such as the FBI, Interpol and others have been successful in tracking down and prosecuting ransomware criminals in the US and other countries. As ransomware threats continue to increase, so does the enforcement activity.
About the Nosu Research
The content we publish on SensorsTechForum.com, this Nosu how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific malware and restore your encrypted files.
How did we conduct the research on this ransomware?
Our research is based on an independent investigation. We are in contact with independent security researchers, and as such, we receive daily updates on the latest malware and ransomware definitions.
Furthermore, the research behind the Nosu ransomware threat is backed with VirusTotal and the NoMoreRansom project.
To better understand the ransomware threat, please refer to the following articles which provide knowledgeable details.
As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.
How to recognize trustworthy sources:
- Always check "About Us" web page.
- Profile of the content creator.
- Make sure that real people are behind the site and not fake names and profiles.
- Verify Facebook, LinkedIn and Twitter personal profiles.
olá, já tem uma ferramenta para descriptografar arquivos .nosu