Kolz ransomware. How to recover .kolz files?

Written by Valdis Koks
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.kolz modified your files, yet that may not be the only injury done to you. The infection might still be hiding on your device. To find out whether this is actually true, we recommend scanning with LOARIS TROJAN REMOVER.

This article intends to help you delete Kolz Ransomware at no cost. Our manual also explain how any .kolz files can be restored.

About Kolz

Kolz Ransomware means a cryptovirology PC hazard made use of to blackmail its targets. Kolz Virus may not point to any obvious signs and symptoms, yet its presence is only found as quickly as its job is done.

Kolz Virus - crypted .kolz files

The absence of signs and symptoms is one of the main difficulties with this type of COMPUTER infections. They can permeate right into the attacked system undetected, as well as apply their job without showing their task in the workstation. This is why most customers are unable to do anything to terminate the infection before it has actually completed its mission, as well as the objective of this one, in particular, is to make its sufferers' documents unusable using information ciphering and after that suggesting a ransom demand.

The customer is reported by means of a message that this infection places on their display that their only solution of bringing their information back is via the payment of a specific amount of funds. This blackmailing element of this fraud is very popular amongst the scams, as well as there's a whole group of PC malware that's made use of in this fashion. This malware classification is called Ransomware, and the malware we are presently concentrating on certainly falls under it.

The Kolz malware is only disclosed once it has completed encrypting the files. The .kolz Ransomware will certainly then express its demands through an intimidating pop-up alert.

It is via this alert that the users find out exactly how they are anticipated to transfer their funds to the cyber fraudulences in charge of the Ransomware infection. In a lot of instances, the ransom would certainly be asked in a cryptocurrency - BitCoin. These cryptocurrencies are actually tough to trace, and also a typical individual would have no chance of recognizing that they are really moving their funds to. This, in fact, makes it really unlikely that the cyberpunk's real identity would ever before get divulged. It is fairly uncommon for a Ransomware cyberpunk to stand on trial, and also the application of cryptocurrency as the recommended repayment solution is the primary factor for that.

Listed below you can discover the quote from the Kolz 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:

How to Kolz virus encrypt your files?

The .kolz Virus file file encryption is not going to be removed after the ransomware is deleted. The .kolz Virus document encryption access key is promised to be given to you when you pay the ransom amount.

Nonetheless, it is not uncommon for the criminals who support such threats to assure their targets a decryption secret for their encrypted records just to decline to supply that vital as soon as the payment gets refined. Needless to point out, if you end up in a problem like this, you would not can doing anything about it-- your funds would be gone, and your information would certainly still be unattainable. This is why it isn't actually smart idea to move the payment, additionally, if you have not opted for any type of alternate choices that may work.

Even though we stated that the security would certainly continue to be on your files even after the Ransomware is no longer in the system, erasing the virus is still incredibly crucial. After you get rid of the Ransomware, you may additionally try the alternate file recovery solutions we have established for you, and likewise your brand-new data will not be at danger of being secured. To erase this cryptoviral risk, you are suggested to finish the actions you will come across listed below.


Name .kolz Virus
Type Ransomware
Threat Level High (Ransomware is thus far the most awful malware you can experience)
Symptoms A Ransomware threat like this one would typically not disclose its existence until the documents obtain locked up
Promotion Channel Channels like spam e-mail promotion, and malvertising are normally the ones used to spread Ransomware.
Data Recovery Solution Emsisoft Decrypter
Detection Utility
.kolz may recover itself plenty of times if you don't get rid of its core files. We suggest downloading LOARIS TROJAN REMOVER to scan for malicious utilities. This may save you a lot of time and efforts to effectively get rid of all possible malware within your device.
Read more about Loaris Trojan Remover (License Agreement, Privacy Policy ).
If Loaris identifies a threat, you will need to buy a license to get rid of it.

Delete Kolz Virus Ransomware

Step 1:

Some of the steps will likely demand you to exit the page. Bookmark it to easily get back to it later.

Reboot in Safe Mode (use this tutorial if you don’t know how to do it).

Step 2:
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We get asked this often, so we are clearly mentioning it here: Deleting .kolz manually may take hours and hurt your system in the process. We suggest downloading LOARIS TROJAN REMOVER to check if it can identify Kolz's documents for you. 

Click CTRL + SHIFT + ESC simultaneously and go to the Processes Tab. Try to identify which processes are malicious.

Task manager - Kolz Open File Location

Right click on each of them and choose Open File Location. Then inspect the documents with online file checker:

Once you open their folder, end the processes that are contaminated, then get rid of their folders. 

Note:If you are particular something becomes part of the danger - eliminate it, even if the scanner does not mark it. No anti-virus application can determine all infections.

Step 3:

Keep holding the Win + R. And then copy & paste the following:

  • notepad %windir%/system32/Drivers/etc/hosts

A new document will certainly open. In case you are hacked, there will be a lots of other IPs connected to your device near the bottom. See the image below:

notepad - suspicious IPs Kolz

In case there are suspicious IPs below “localhost” – get in touch with us in the comments.

Use CTRL + SHIFT + ESC simultaneously and access the Startup Tab:

Task manager - Startup Tab Program Disable

Proceed to Program Name and select “Disable”.

Keep in mind that ransomware may even include a fake developer name to its process. You must check out every process and be persuaded that it is legitimate.

Step 4:
To get rid of Kolz Virus, you may have to deal with system files and registries. Making a mistake and getting rid of the wrong thing may hurt your device.


You can prevent the system damage by selecting LOARIS TROJAN REMOVER - a high-quality Kolz removal software.

Read review about LOARIS TROJAN REMOVER (License Agreement, Privacy Policy ).

Look for the ransomware  in your registries and get rid of the entries. Be very careful –  you can destroy your system if you remove entries not associated with the ransomware.

Type each of the following in the Windows Search Field:

  • %AppData%
  • %LocalAppData%
  • %ProgramData%
  • %WinDir%
  • %Temp%

Get rid of everything in Temp. Finally, simply check out for anything lately added. Don't forget to drop us a comment if you run into any issue!

How to Decrypt .kolz files?

Djvu Ransomware essentially has two versions.

  1. Old Version: Most older extensions (from “.djvu” up to “.carote”) decryption for most of these versions was previously supported by STOPDecrypter tool in case if infected files with an offline key. That same support has been incorporated into the new Emsisoft Decryptor for these old Djvu variants. The decrypter will only decode your files without submitting file pairs if you have an OFFLINE KEY.
  2. New Version: The newest extensions released around the end of August 2019 after the ransomware was changed. This includes .coharos, .shariz, .gero, .hese, .xoza, .seto, peta, .moka, .meds, .kvag, .domm, .karl, .nesa, .boot and etc….These new versions were supported only with Emsisoft Decryptor.

"The decrypter can't decrypt my files?"

Most of the times this indicates you have an online ID. It could also mean your documents were encrypted by a newer version of STOP/Djvu.

  • Offline ID. When the ransomware can not attach to its command and control servers while encrypting your files, it uses a built-in encryption key and a built-in ID. Offline ID's generally end in t1 and also are normally very easy to identify. Considering that the offline key and ID just change with each variant/extension, everybody who has had their documents encrypted by the same variation will have the very same ID and also the files will be decryptable by the exact same key (or "personal key when it comes to RSA encryption).
  • Online ID. In many cases the ransomware has the ability to link to its command and control servers when it secures data, and when this happens the servers respond by producing arbitrary keys for each and every infected computer. Considering that each computer has its very own key, you can't make use of a key from another computer system to decrypt your data. The decrypter is capable of working around this with older variations as long as it has some help, nonetheless for newer versions there is nothing that can be done to recover data.

In case when the tutorial doesn’t help, download the anti-malware tool we suggest or try free online virus checker. Furthermore, you may always ask us in the comments for assistance!

About the author

Valdis Koks

Security engineer, reverse engineering and memory forensics

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