Djvu VirusRansomwareRemoval Guide

Nobu Virus Removal Guide (+Decrypt .nobu files)

Nobu Virus Ransomware

Nobu is a malicious software functioning as common ransomware. Michael Gillespie, the well-known malware researcher, first found this new name in the DJVU ransomware family.

Nobu was developed for the sole purpose to encrypt all popular file types. Logically, as soon as the encryption is successfully achieved, the users are unable to get access to them. Nobu virus includes its own “.nobu” to all the encrypted data. For example, the file “price_list.xls”, once modified by Nobu, will be titled as “price_list.xls.nobu”. Once the file encryption is achieved, Nobu puts its own distinct text document (_readme.txt) into all the folders that save the encrypted files.

The message stated by document requesting the random os extremely similar to the notices provided by other ransomware threats belonging to the DJVU family. The warning essentially shows that the data has been secured and the only service to get access to it is to use a special standalone key. Regretfully, this statement is definitely true.

The method to encrypt the files utilized by Nobu is not totally looked into. Nevertheless, there is no doubt that each computer system owner might be issued an unique decryption key, which is definitely special. It is exceptionally difficult to recuperate the data without the appropriate key in location.

“Don’t worry, you can return all your files!”, from _readme.txt message:

message from Nobu virus

One more peculiarity of the Nobu virus is that the users are unable to get access to the key. The decrypting key is hosted on a special server under the total control by the scoundrels who have introduced the Nobu ransomware into the world wide web. In order to obtain the key and restore the important data, the users are informed to connect with the scams by means of e-mail or by telegram and to pay the ransom in the quantity of $980.

The message also states that the people must call the Nobu authors within 72 hours upon the minute of the information file encryption. The alert shows that by doing so the people will obtain a 50% discount rate, therefore, the ransom amount falls to $490.

No matter what the quantity of the ransom is, we highly advise that you do not pay the ransom. There is no warranty that these online crooks will keep their guarantees, so they may not care at all what the victims feel about the encryption, even when the amount of the ransom is gotten into their accounts. Thus, paying ransom often does not lead to an effective recovery. So, the users may just lose their money for nothing.

Likewise, we advise you not to get in touch with the scams as they instruct. Do not transfer money into their wallets. There are no applications that might crack the Nobu ransomware or bring back the data at no cost. Therefore, the only right choice is to restore the information from possible backups (if available).

Virus Summary

NameNobu Ransomware
File Extensionnobu
TypeRansomware
FamilyDJVU
Short DescriptionThe ransomware encrypts all the data stored on your system and requires a ransom to be paid on your part supposedly to recover your important files.
SymptomsFile encryption by the ransomware is performed by means of the AES-256 algorithm (CFB mode) encryption algorithm. Once the encryption is completed, the ransomware adds its special .nobu extension to all the files modified by it.
Distribution MethodAdware bundles and software cracks
Similar InfectionsWeui, Lisp, Sglh
Nobu Removal Tool   GridinSoft Anti-Malware
Nobu Decryption Tool   Emsisoft Djvu Decryptor

Do not forget that the Internet is now filled with infections comparable to the Nobu ransomware. For instance, this particular danger is generally similar to Brusaf and other ransomware-type infections. These damaging utilities have actually been established in order to secure the essential data and reveal the need for the users to pay the ransom. All these infections utilize the identical algorithm to generate the specific key for effective information decryption.

Unless the Nobu ransomware is still under the advancement procedure or has got some concealed bugs, it is not possible to bring back the information manually. Thus, the only working service to prevent the loss of your crucial information is to regularly keep updated backups of all your crucial files.

Another essential piece of guidance is to keep the backups on special storage not connected to your main computer. For example, you might keep it on the USB Flash Drive, or some external hard disk, or by using the cloud data storage services. Keeping the backups on your routine drive is extremely dangerous, considering that the backup might likewise be secured by the Nobu virus.

Leakages for the Nobu ransomware attack.

Nobu uses many courses to penetrate the susceptible computer systems. It is not certain what specific approach was used in your case, nevertheless, the invasion might happen via the following channels:

  • bundling with third-party programs, primarily freeware;
  • spam emails from the unidentified senders;
  • websites supplying free hosting;
  • P2P (peer-to-peer) torrent software.

There are times when the Nobu virus may disguise itself as some authentic application, for example, through the deceptive informs demanding installation of some software upgrade. This is the most common trick utilized by the scams to inject the Nobu virus files into the system. In this manner users partly take part in its installation, without plainly understanding the threat.

In addition, the scams might send out unsolicited spam e-mail with difficult signals encouraging individuals to open suspicious accessories or click some download links, for example, those encouraging the people to open specific photos, text files, tax files and other info.

No doubt, opening these files or clicking on the malicious links might essentially damage the system. Fake Media Player update notices may lead to the Nobu ransomware seepage. Likewise, downloading the cracked software application might in addition contain the ransomware installer. The last however not the least, setup of Nobu might happen through some Trojan horses that might be installed stealthily into the system and without the user’s direct permission or even permission.

Preventing the Nobu virus injection.

Of course, there is no absolute guarantee that your computer system will be always free of any malware attacks, however, we want to share some helpful pointers with you to make it safer. Make certain to pay really attention while searching the web and specifically while getting cost-free programs. Do not open any dubious email accessories, particularly if the sender is not understood to you.

Do not forget that specific freeware installer may likewise contain some other extra apps in the bundle. These additional applications might be really destructive. It is of utmost value to keep your anti-virus software and your operating system in basic to be always correctly upgraded.

It is quite rational that downloading cracked programs is prohibited, nevertheless, furthermore, such unauthorized programs usage might likewise bring serious damage to your system. Thus, do not download any split programs. Plus, the fact that your existing anti-virus did not secure the system from the Nobu ransomware is a good reason for you to reassess your options and switch to another program that can render the safeguarding functions on a far better level.

Below please find the quotation from the Nobu text file:

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-2P5WrE5b9f
 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:
 restorealldata@firemail.cc
  
 Reserve e-mail address to contact us:
 gorentos@bitmessage.ch 

 Our Telegram account:
 @datarestore

Screenshot of files with “.nobu” extension added by the ransomware:”

Nobu Ransomware - encrypt files with .nobu extension

Use GridinSoft Anti-Malware to remove Nobu ransomware from your computer

1.Download GridinSoft Anti-Malware.

You can get GridinSoft Anti-Malware by clicking the button below:

  GridinSoft Anti-Malware

2. Double-click on the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-ag.exe file to install GridinSoft Anti-Malware on your computer.
GridinSoft Anti-Malware
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
GridinSoft Anti-Malware Setup

3. Press Install button for run GridinSoft Anti-Malware.

GridinSoft Anti-Malware Install

3.Once installed, GridinSoft Anti-Malware will automatically run.

GridinSoft Anti-Malware  Start

4. Wait for the GridinSoft Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your computer for Win Speedup 2018 and other malicious programs. This process can take a 20-30 minutes, so we suggest you periodically check on the status of the scan process.
GridinSoft Anti-Malware Scan

5. Click on “Clean Now”.

When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
GridinSoft Anti-Malware Scan Result

Use Emsisoft Decryptor for restore nobu files

You can get Emsisoft Decryptor by clicking the button below:

  Emsisoft Decryptor

  1. Run the decryptor as an administrator. The license terms will show up, which you have to agree to by clicking the “Yes” button.
  2. Once the license terms are accepted, the primary decryptor user interface opens.
  3. By default, the decryptor will pre-populate the locations to decrypt with the currently connected drives and network drives. Additional locations can be added using the Add” button.
  4. Decryptors typically offer various options depending on the particular malware family. The available options are located in the Options tab and can be enabled or disabled there. You can find a detailed list of the available Options below.
  5. After you have added all the locations you want to decrypt to the list, click the “Decrypt” button to start the decryption process. The screen will switch to a status view, informing you about the current process and decryption status of your files
  6. The decryptor will inform you once the decryption process is finished. If you require the report for your personal records, you can save it by clicking the “Save log” button. You can also copy it straight to your clipboard to paste it into emails or forum posts if you are asked to.
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Daniel Zimmermann

Daniel Zimmermann has been writing on security and malware subjects for many years and has been working in the security industry for over 10 years. Daniel was educated at the Saarland University in Saarbrücken, Germany and currently lives in New York.

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