Djvu VirusRansomwareRemoval Guide

Cool Virus Removal Guide (+Decrypt .cool files)

Cool Virus Ransomware

Cool is a destructive software application working as typical ransomware. Michael Gillespie, the popular virus researcher, first discovered this new name in the DJVU ransomware family.

Cool was developed for the sole purpose to encrypt all popular file types. Rationally, as soon as the encryption is effectively achieved, the users are unable to get access to them. Cool ransomware adds its own “.cool” to all the encrypted data. For instance, the file “price_list.xls”, once crypted by Cool, will be entitled as “”. As soon as the file encryption is accomplished, Cool puts its own unique text document (_readme.txt) into all the folders that save the encrypted files.

The alert stated by _readme.txt requesting for the random os really similar to the notices offered by other ransomware dangers coming from the DJVU family. The warning essentially indicates that the files have been secured and the only solution to get access to it is to use a distinct standalone key. Regretfully, this declaration is definitely real.

The method to encrypt the files utilized by Cool is not totally investigated. Nevertheless, there is no doubt that each computer owner might be provided an unique decryption key, which is definitely unique. It is extremely tough to recover the data without the proper type in place.

“Don’t worry, you can return all your files!”, from text file message:

message from Cool virus

One more peculiarity of the Cool infection is that the users are not able to get access to the key. The decrypting key is hosted on an unique server under the complete control by the criminals who have introduced the Cool virus into the web. In order to get the key and bring back the essential information, the users are told to get in touch with the frauds via e-mail or by telegram and to pay the ransom in the amount of $980.

The message likewise states that individuals must call the Cool authors within 72 hours upon the minute of the information file encryption. The alert indicates that by doing so the people will get a 50% discount rate, therefore, the ransom quantity drops down 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 criminals will keep their promises, so they might not care at all what the victims feel about the file encryption, even when the amount of the ransom is gotten into their accounts. For this reason, paying ransom often does not result in an effective healing. So, the users might simply lose their money for nothing.

Likewise, we advise you not to contact the frauds as they instruct. Do not move money into their wallets. There are no applications that might split the Cool ransomware or bring back the information at no charge. For that reason, the only correct decision is to restore the data from possible backups (if readily available).

Virus Summary

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

Do not forget that the Web is now full of infections comparable to the Cool ransomware. For example, this specific danger is basically identical to Brusaf and other ransomware-type infections. These harmful energies 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 use the identical algorithm to produce the particular key for successful information decryption.

Unless the Cool ransomware is still under the advancement process or has got some concealed bugs, it is not possible to restore the information manually. Therefore, the only working service to avoid the loss of your important information is to routinely keep up-to-date backups of all your important files.

Another crucial piece of advice is to keep the backups on special storage not connected to your primary computer. For example, you may store it on the USB Flash Drive, or some external hard disk drive, or by using the cloud data storage services. Keeping the backups on your regular drive is very dangerous, considering that the backup may also be secured by the Cool ransomware.

Leakages for the Cool ransomware attack.

Cool utilizes lots of paths to penetrate the vulnerable computers. It is not particular what particular approach was utilized in your case, nevertheless, the invasion might happen through the following channels:

  • bundling with third-party programs, mainly freeware;
  • spam e-mails from the unknown senders;
  • websites providing free hosting;
  • P2P (peer-to-peer) torrent downloads.

There are times when the Cool virus may camouflage itself as some authentic application, for example, through the misleading notifies requiring setup of some software application update. This is the most typical technique utilized by the frauds to inject the Cool virus files into the system. By doing this users partly take part in its setup, without plainly understanding the risk.

In addition, the scams may send unsolicited spam e-mail with difficult alerts encouraging individuals to open dubious accessories or click some download links, for example, those encouraging the people to open particular images, text files, tax files and other info.

No doubt, opening these files or clicking on the destructive links might essentially damage the system. Fake Acrobat Reader update notices may cause the Cool ransomware seepage. Likewise, downloading the cracked software might in addition include the ransomware installer. The last but not the least, setup of Cool might take place through some Trojan horses that may be installed stealthily into the system and without the user’s direct approval and even permission.

Avoiding the Cool ransomware attack.

Of course, there is no absolute warranty that your computer system will be always without any malware attacks, however, we wish to share some useful tips with you to make it much safer. Ensure to pay really close attention while browsing the web and especially while getting cost-free programs. Do not open any dubious email attachments, especially if the sender is not known to you.

Do not forget that specific freeware installer may likewise include some other extra apps in the package. 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 constantly correctly updated.

It is quite sensible that downloading cracked software is prohibited, nevertheless, additionally, such unauthorized programs use may likewise bring severe damage to your computer. Thus, do not download any cracked programs. Plus, the fact that your current anti-virus did not safeguard the system from the Cool ransomware is an excellent reason for you to reevaluate 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 Cool 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 “.cool” extension added by the virus:”

Cool Ransomware - encrypt files with .cool extension

Use GridinSoft Anti-Malware to remove Cool 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 cool 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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  1. File: D:\From C\Downloads\Documents\IIFS Annual Report 2077-78
    Error: No key for New Variant online ID: VKAkM3vwKEQN40ZLOqFYoNDXkvk3GfcH5h2MD2d7
    Notice: this ID appears to be an online ID, decryption is impossible

  2. File: C:\Users\dell\OneDrive\Desktop\Choota
    Error: No key for New Variant offline ID: vkkerIMedP7WK1ZhHOAlJV10Wxn9fHEbEQbgait1
    Notice: this ID appears be an offline ID, decryption MAY be possible in the future

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