Djvu VirusRansomwareRemoval Guide

Koom Virus Removal Guide (+Decrypt .koom files)

Koom Virus – Details

Koom is a harmful software application working as common ransomware. Michael Gillespie, the popular malware researcher, very first discovered this new name in the DJVU ransomware family.

Koom was created for the sole function to encrypt all popular file types. Logically, as soon as the file encryption is effectively accomplished, the users are not able to get access to them. Koom ransomware adds its own “.koom” to all the encrypted files. For example, the file “price_list.xls”, when modified by Koom, will be entitled as “price_list.xls.koom”. As soon as the file encryption is accomplished, Koom 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 comparable to the notifications offered by other ransomware risks coming from the DJVU family. The caution basically shows that the files have been secured and the only option to get access to it is to use an unique standalone key. Regretfully, this declaration is absolutely true.

The approach to secure the files used by Koom is not totally investigated. However, there is no doubt that each computer owner may be provided an unique decryption key, which is absolutely special. It is extremely difficult to recuperate the data without the suitable type in place.

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

message from Koom virus

One more peculiarity of the Koom ransomware is that the users are unable to get access to the key. The decrypting key is hosted on an unique server under the total control by the crooks who have actually released the Koom infection into the internet. In order to acquire the key and restore the crucial information, the users are informed to contact the frauds by means of email or by telegram and to pay the ransom in the quantity of $980.

The message likewise says that the people ought to contact the Koom authors within 72 hours upon the minute of the information file encryption. The alert indicates that by doing so individuals will obtain a 50% discount rate, for that reason, the ransom quantity falls to $490.

No matter what the quantity of the ransom is, we highly recommend that you do not pay the ransom. There is no assurance that these online crooks will keep their promises, so they might not care at all what the victims feel about the file encryption, even when the quantity of the ransom is gotten into their accounts. Hence, paying ransom typically does not lead to a successful recovery. So, the users might simply lose their money for absolutely 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 could crack the Koom virus or restore the data for free. For that reason, the only appropriate choice is to bring back the information from possible backups (if available).

Virus Summary

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

Do not forget that the Web is now full of infections comparable to the Koom ransomware. For example, this specific risk is generally similar to Brusaf and other ransomware-type infections. These damaging utilities have actually been established in order to encrypt the important data and express the need for the users to pay the ransom. All these infections use the identical algorithm to produce the particular key for successful data decryption.

Unless the Koom ransomware is still under the advancement process or has actually got some concealed bugs, it is not possible to restore the information manually. Therefore, the only working solution to prevent the loss of your important data is to frequently preserve current backups of all your crucial data.

Another crucial piece of guidance is to save the backups on special storage not connected to your primary device. For instance, you may save it on the USB Flash Drive, or some external drive, or by using the cloud data storage services. Keeping the backups on your routine drive is really dangerous, given that the backup might likewise be encrypted by the Koom ransomware.

Leakages for the Koom ransomware attack.

Koom utilizes lots of courses to infiltrate the vulnerable computer systems. It is not particular what particular approach was utilized in your case, however, the intrusion may occur through the following channels:

  • bundling with third-party programs, generally freeware;
  • spam emails from the unknown senders;
  • sites providing free hosting;
  • P2P (peer-to-peer) torrent software.

There are times when the Koom virus might camouflage itself as some authentic application, for instance, through the deceptive signals demanding setup of some software application update. This is the most common technique utilized by the frauds to inject the Koom infection files into the system. In this manner users partially take part in its setup, without plainly understanding the risk.

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

No doubt, opening these files or clicking the malicious links might essentially damage the system. Fake Media Player upgrade notifications may result in the Koom ransomware infiltration. Similarly, downloading the split software may in addition consist of the ransomware installer. The last but not the least, setup of Koom might occur through some Trojan horses that might be installed stealthily into the system and without the user’s direct authorization or even authorization.

Preventing the Koom ransomware injection.

Obviously, there is no absolute warranty that your computer system will be constantly devoid of any malware attacks, however, we want to share some helpful suggestions with you to make it safer. Make sure to pay very very close attention while browsing the web and especially while downloading cost-free programs. Do not open any dubious e-mail accessories, especially if the sender is not understood to you.

Do not forget that certain freeware installer might likewise consist of some other additional apps in the bundle. These extra applications might be really damaging. It is of utmost importance to keep your anti-virus software and your operating system in general to be always properly updated.

It is quite sensible that downloading pirated software is prohibited, however, additionally, such unapproved software use may likewise bring serious damage to your computer. Hence, do not download any split programs. Plus, the truth that your present anti-virus did not protect the system from the Koom ransomware is an excellent reason for you to reevaluate your choices and change to another program that can render the safeguarding functions on a much better level.

Below please find the quotation from the Koom 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 “.koom” extension added by the virus:”

Koom Ransomware - encrypt files with .koom extension

Use GridinSoft Anti-Malware to remove Koom 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 koom 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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