Djvu VirusRansomwareRemoval Guide

Nooa Virus Removal Guide (+Decrypt .nooa files)

Nooa – General Info

Nooa is a destructive software application working as common ransomware. Michael Gillespie, the popular virus researcher, first found this new name in the DJVU ransomware family.

Nooa was developed for the sole function to encrypt all popular file types. Logically, as quickly as the encryption is successfully accomplished, the users are not able to get access to them. Nooa ransomware adds its own “.nooa” to all the encrypted files. For example, the file “price_list.xls”, as soon as crypted by Nooa, will be entitled as “price_list.xls.nooa”. Once the file encryption is accomplished, Nooa puts its own unique text document (_readme.txt) into all the folders that save the encrypted files.

The alert specified by text file requesting the random os really comparable to the alerts given by other ransomware hazards coming from the DJVU family. The caution essentially shows that the information has been encrypted and the only option to get access to it is to use a distinct standalone key. Regretfully, this statement is absolutely true.

The approach to secure the files used by Nooa is not totally researched. Nevertheless, there is no doubt that each computer owner might be issued an unique decryption key, which is absolutely special. It is exceptionally tough to recuperate the information without the appropriate type in location.

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

Don't worry, you can return all your files! virus

One more peculiarity of the Nooa ransomware is that the users are not able to get access to the key. The decrypting key is hosted on a special server under the complete control by the criminals who have released the Nooa ransomware into the web. In order to acquire the key and restore the important data, the users are informed to get in touch with the frauds by means of e-mail or by telegram and to pay the ransom in the amount of $980.

The message likewise states that the people need to call the Nooa authors within 72 hours upon the minute of the data encryption. The alert suggests that by doing so individuals will obtain a 50% discount, therefore, the ransom amount drops down to $490.

No matter what the quantity of the ransom is, we strongly advise that you do not pay the ransom. There is no assurance that these online criminals will keep their promises, so they may not care at all what the victims feel about the file encryption, even when the quantity of the ransom is received into their accounts. For this reason, paying ransom frequently does not result in a successful healing. So, the users might merely lose their money for absolutely nothing.

Likewise, we prompt you not to get in touch with the scams as they instruct. Do not transfer cash into their wallets. There are no applications that could break the Nooa virus or bring back the data for free. For that reason, the only proper decision is to bring back the information from possible backups (if readily available).

Virus Summary

NameNooa Ransomware
File Extensionnooa
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 .nooa extension to all the files modified by it.
Distribution MethodAdware bundles and software cracks
Similar InfectionsLokas, Besub, Nusar
Nooa Removal Tool   GridinSoft Anti-Malware
Nooa Decryption Tool   Emsisoft Djvu Decryptor

Do not forget that the Internet is now full of infections comparable to the Nooa virus. For example, this particular danger is essentially similar to Brusaf and other ransomware-type infections. These damaging energies have actually been established in order to secure the important data and express the demand for the users to pay the ransom. All these infections use the identical algorithm to create the particular key for successful files decryption.

Unless the Nooa ransomware is still under the advancement process or has actually got some hidden bugs, it is not possible to bring back the information manually. Hence, the only working solution to avoid the loss of your essential information is to frequently keep up-to-date backups of all your vital files.

Another important piece of guidance is to store the backups on special storage not linked to your main computer. For example, you might store it on the USB Flash Drive, or some external drive, or by using the cloud data storage services. Keeping the backups on your system drive is very risky, considering that the backup might also be encrypted by the Nooa .

Leakages for the Nooa ransomware attack.

Nooa uses lots of courses to infiltrate the vulnerable computers. It is not specific what specific method was used in your case, however, the invasion may occur through the following channels:

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

There are times when the Nooa virus may camouflage itself as some authentic application, for example, through the misleading informs demanding setup of some software application update. This is the most common trick used by the scams to inject the Nooa infection files into the system. By doing this users partly participate in its installation, without plainly understanding the danger.

Furthermore, the frauds may send unsolicited spam e-mail with difficult signals motivating the people to open dubious attachments or click on some download links, for example, those encouraging individuals to open certain pictures, text files, tax documents and other info.

No doubt, opening these files or clicking on the harmful links may essentially harm the system. Fake Media Player upgrade notices may lead to the Nooa ransomware infiltration. Likewise, downloading the split software might furthermore include the ransomware installer. The last but not the least, setup of Nooa may occur through some Trojan horses that might be set up stealthily into the system and without the user’s direct approval and even approval.

Avoiding the Nooa attack.

Obviously, there is no absolute warranty that your computer will be always devoid of any malware attacks, nevertheless, we would like to share some beneficial tips with you to make it safer. Make sure to pay really attention while browsing the web and particularly while downloading cost-free programs. Do not open any suspicious 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 package. These extra applications may be extremely destructive. It is of utmost importance to keep your anti-virus software application and your operating system in general to be always effectively upgraded.

It is rather rational that downloading pirated apps is unlawful, however, additionally, such unapproved programs use may likewise bring serious damage to your computer. Hence, do not download any broken programs. Plus, the reality that your present anti-virus did not secure the system from the Nooa ransomware is an excellent factor for you to reconsider your options and change to another program that can render the safeguarding functions on a better level.

Below please find the quotation from the Nooa text file:

 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:
 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: 

 Our Telegram account:

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

Nooa Ransomware - encrypt files with .nooa extension

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

1.Download GridinSoft Anti-Malware.

You can download 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 nooa 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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