What is Kolz Ransomware

The epidemy of STOP Ransomware still goes on, with its another successor called Kolz Ransomware. This nasty virus hits thousands of computers all over the world, mostly targeting USA, Europe and Australia. The most recent version uses .kolz extension, that it adds to the end of encrypted files. As DjVu Ransomware uses AES encryption algorithm, probability of decryption is low, but exists. Kolz Ransomware damages user’s important data: photos, videos, documents, and other types of information, victims are ready to pay ransom for. At the same time, it doesn’t touch system files to keep Windows operable. Latest generation of this virus creates ransom note file called _readme.txt. In this file it provides general information about infection, ransom amount and contact details:

Kolz Ransomware (.kolz extensions)
ATTENTION!
Don't worry, you can return all your files!
All your files like pictures, 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-SY0GqQtRAT
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@airmail.cc
Your personal ID:
{random-44-character-alphanumeric-id}

The ransom note is typical. Malefactors let victims get acquainted with the conditions and price of the ransom, which is $980 and disclose e-mail addresses for contact helpmanager@mail.ch and restoremanager@airmail.cc. Although developers affirm, that there is not possible to recover files without paying the ransom, the objective situation is different. The virus code has bugs, that allow security specialists to retrieve the key in some cases. Particularly, if the PC is disconnected from the web during the encryption process, or hackers servers are unavailable – Kolz Ransomware generates an offline key. This key can be found with a special decryption tool called STOP Djvu Decryptor. Below we provide you with download links and instructions to use this utility. If you are in the list of the lucky ones, who experienced all the mentioned coincidences, your files can be decrypted. 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 some copies of encrypted files, that were removed earlier. The ultimate guide to remove Kolz Ransomware and decrypt .kolz files for free.

  1. Download Kolz Ransomware Removal Tool
  2. Get decryption tool for .kolz 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 Kolz Ransomware

How Kolz Ransomware infected your PC

Virus modifies “hosts” file to block Windows updates, downloading antivirus programs, and visiting sites related to security news or offering security solutions. Kolz Ransomware comes along with AZORult trojan, which was initially created to steal logins and passwords. The process of infection also looks like installing Windows updates, the malware shows a fake window, that mimics the update process.

fake windows update from Kolz 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. Kolz Ransomware virus is propagated via spam attack with malicious e-mail attachments and using manual PC hacking. Can be distributed by hacking through an unprotected RDP configuration, fraudulent downloads, exploits, web injections, fake updates, repackaged, and infected installers. Virus assigns a certain ID with the victims, that is used to name those files and supposedly to send decryption key. Great tools to protect against Kolz Ransomware are: Emsisoft Anti-Malware and Malwarebytes Anti-Malware.

Download Kolz Ransomware Removal Tool

Download Removal Tool

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

Alternative Removal Tool

Download SpyHunter 5

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

How to remove Kolz Ransomware manually

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

Kolz Ransomware files:

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

Kolz Ransomware registry keys:

no information

How to decrypt and restore .kolz files

Use automated decryptors

Download STOP Djvu Decryptor from EmsiSoft (.kolz 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 .kolz files, encrypted by Kolz 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 .kolz 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 Kolz 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 .kolz 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 Kolz 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. Kolz 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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