What is Kook Ransomware

If your files became unavailable, got weird icons and got .kook extension, that means your computer got hit by Kook Ransomware (also known as STOP Ransomware or Djvu Ransomware). This is an extremely dangerous and harmful encryption virus, that encodes data on victim’s computers and extorts ransom equivalent of $490/$960 in cryptocurrency to be paid on an anonymous electronic wallet. If you didn’t have backups before the infection, there are only a few ways to return your files with a low probability of success. However, they are worth trying and we describe them all in the following article. In the text box below, you can get acquainted with the contents of _readme.txt file, which is called “ransom note” among security specialists and serves as one of the symptoms of the infection. From this file, users get information about the technology behind the decryption, price of the decryption, and contact details of the authors of this piece of malware.

STOP Ransomware (.kook extension)
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:
hxxps://we.tl/t-s4NpK2lgQA
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:
helpmanager@mail.ch
Reserve e-mail address to contact us:
restoremanager@firemail.cc
Your personal ID:
{alphanumeric sequence}

Although the ransom amount may seem not that big for someone, you should mention, that there is absolutely NO guarantee, that developers will respond to you or send any decryption tool. There is a tool called STOPDecrypter from Emsisoft, that was able to brute-force the key or find an offline master key for some versions of STOP Ransomware. But according to reports from the BleepingComputer forum and the authors of the decryption tool, it is currently useless against .kook files. However, things may change and we still place links and instructions for it, in case STOPDecrypter will be updated. So, for today there are a few options to restore encrypted information and they all are listed below. There are standard Windows system functions, such as restore points, the shadow copies, previous versions of files, can be useful, although, malicious algorithms often prevent such opportunities. Stellar Data Recovery Professional is one of the best file-recovery tools and, if used properly, may recover copies and duplicates of encrypted files, that were removed prior to infection. Try recommendations on the page to remove STOP Ransomware and decrypt .kook files with help of the tools recommended.

  1. Download Kook Ransomware Removal Tool
  2. Get decryption tool for .kook files
  3. Recover encrypted files with Stellar Data Recovery Professional
  4. Restore encrypted files with Windows Previous Versions
  5. Restore files with Shadow Explorer
  6. How to protect from threats like Kook Ransomware

How Kook Ransomware infected your PC

Malicious software created using the STOP virus gets four files when it enters a computer. One of them provokes the appearance of a fake message about Windows system updates. In this way, it lulls the user’s alertness. Cybercriminals do not name the cost of decryption but promise to make a discount if the user in the near future turns to them for help.

fake windows update from Kook Ransomware

It uses rdpclip.exe to replace a legal Windows file and to launch an attack on a computer network. After encrypting the files, the encrypter is deleted using the delself.bat command file. Kook Ransomware virus is propagated via spam attack with malicious e-mail attachments and using manual PC hacking. It can be distributed by hacking through an unprotected RDP configuration, fraudulent downloads, exploits, web injections, fake updates, repackaged, and infected installers. Virus assigns certain ID with the victims, that is used to name those files and supposedly to send decryption key. Great tools to protect against Kook Ransomware are: Emsisoft Anti-Malware and Malwarebytes Anti-Malware.

Download Kook Ransomware Removal Tool

Download Removal Tool

To remove Kook Ransomware completely, we recommend you to use WiperSoft AntiSpyware from WiperSoft. It detects and removes all files, folders and registry keys of Kook Ransomware and prevents future infections by similar viruses.

Alternative Removal Tool

Download SpyHunter 5

To remove Kook Ransomware completely, we recommend you to use SpyHunter 5 from EnigmaSoft Limited. It detects and removes all files, folders, and registry keys of Kook Ransomware. The trial version of SpyHunter 5 offers virus scan and 1-time removal for FREE.

How to remove Kook Ransomware manually

It is not recommended to remove Kook Ransomware manually, for safer solution use Removal Tools instead.

Kook Ransomware files:

_readme.txt
rdpclip.exe
delself.bat
{randomname}.exe

Kook Ransomware registry keys:

no information

How to decrypt and restore .kook files

Use automated decryptors

Download STOP Djvu Decryptor from EmsiSoft (.kook variations)

IMPORTANT: Read this detailed guide on using STOP Djvu Decryptor to avoid file corruption and time wasting.

STOP djvu ransomware decryptor from emsisoft

STOP Djvu Decryptor is able to decrypt .kook files, encrypted by Kook Ransomware. This tool was developed by EmsiSoft. It works in automatic mode, but in most cases works only for files encrypted with offline keys. Download it here:

Download STOP Djvu Decryptor

Dr.Web Rescue Pack

Famous antivirus vendor Dr. Web provides free decryption service for the owners of its products: Dr.Web Security Space or Dr.Web Enterprise Security Suite. Other users can ask for help in the decryption of .kook files by uploading samples to Dr. Web Ransomware Decryption Service. Analyzing of files will be performed free of charge and if files are decryptable, all you need to do is purchase 2-year license of Dr.Web Security Space worth $120 or less. Otherwise, you don’t have to pay.

If you are infected with Kook Ransomware and removed it from your computer, you can try decrypting your files. Antivirus vendors and individuals create free decryptors for some crypto-lockers. To attempt to decrypt them manually you can do the following:

Use Stellar Data Recovery Professional to restore .kook files

stellar data recovery professional

  1. Download Stellar Data Recovery Professional.
  2. Click Recover Data button.
  3. Select type of files you want to restore and click Next button.
  4. Choose location where you would like to restore files from and click Scan button.
  5. Preview found files, choose ones you will restore and click Recover.
Download Stellar Data Recovery Professional

Using Windows Previous Versions option:

  1. Right-click on infected file and choose Properties.
  2. Select Previous Versions tab.
  3. Choose particular version of the file and click Copy.
  4. To restore the selected file and replace the existing one, click on the Restore button.
  5. In case there is no items in the list choose alternative method.

Using Shadow Explorer:

  1. Download Shadow Explorer program.
  2. Run it and you will see screen listing of all the drives and the dates that shadow copy was created.
  3. Select the drive and date that you want to restore from.
  4. Right-click on a folder name and select Export.
  5. In case there are no other dates in the list, choose alternative method.

If you are using Dropbox:

  1. Login to the DropBox website and go to the folder that contains encrypted files.
  2. Right-click on the encrypted file and select Previous Versions.
  3. Select the version of the file you wish to restore and click on the Restore button.

How to protect computer from viruses like Kook Ransomware in future

1. Get special anti-ransomware software

Use BitDefender Anti-Ransomware

bitdefender anti-ransomware

Famous antivirus vendor BitDefender released a free tool, that will help you with active anti-ransomware protection, as an additional shield to your current protection. It will not conflict with bigger security applications. If you are searching complete internet security solution consider upgrading to full version of BitDefender Internet Security 2018.

Download BitDefender Anti-Ransomware

2. Back up your files

idrive backup

As an additional way to save your files, we recommend online backup. Local storages, such as hard drives, SSDs, flash drives or remote network storages can be instantly infected by the virus once plugged in or connected to. Kook Ransomware uses some techniques to exploit this. One of the best services and programs for easy automatic online backup is iDrive. It has the most profitable terms and simple interface. You can read more about iDrive cloud backup and storage here.

3. Do not open spam e-mails and protect your mailbox

mailwasher pro

Malicious attachments to spam or phishing e-mails are the most popular method of ransomware distribution. Using spam filters and creating anti-spam rules is good practice. One of the world leaders in anti-spam protection is MailWasher Pro. It works with various desktop applications and provides a very high level of anti-spam protection.

Download MailWasher Pro

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