How to remove Kolz virus and restore encrypted files

The entry is about Kolz virus that infects customers' PC in diverse countries of the world, and encrypts their files. In this page we've gathered important information on what is Kolz, and the uninstalling of Kolz from your workstation. In addition, we'll teach you how to restore the cyphered data, if possible.

Kolz ransomware virus

Kolz ransomware had infected many computers in different parts of the world with help of most effective way: scam messages with dangerous attachments. Also, fraudsters use zero-day vulnerabilities to penetrate the computer, but they are promptly corrected. After penetration, ransomware checks the PC memory, defines the number of files for encryption and their general worth. Nowadays, any new ransomware knows how to cypher audio, image, video and text info in all known formats. Ransomware corrupts all folders, but the ones that look like business records go first. Kolz corrupts only information, and doesn't spoil the programs, so that the man can pay the ransom via an infected PC. The operation is performed via world-known RSA and AES algorithms, and it is so sophisticated that that it can't be bruteforced. Such complexity creates base for impressive efficiency of ransomware in last years: an ordinary PC operator, even if he has a pretty good knowledge of the computer, won't ever be able to get back the data, and will need to pay the price. The only way to recover files is to hack the scam website and get the encryption keys. Also there's a way to withdraw encryption keys due to defects in viruse's program code.

The computer knowledge is highly substantial in our century, since it assists you to guard the laptop from computer viruses. For ransomware this is most relevant, as, in contradistinction to common undesired programs, when you delete ransomware from the computer, the fruits of its doings won't vanish anywhere. To defend yourself, you need to remember these three simple regulations:

    • Do not admit any alterations to the PC, originating from strange programs. One of the basic manners of file restoration is the recovery from Shadow Copies, and fraudsters have included the elimination of SC in the default functionality of viruses. Anyway, deleting of shadow copies needs admin rights and your confirmation. If you'll think for few seconds before confirming the dialogue box, it may save your files and your money.
    • Don't neglect the red flags that your machine displays. It needs much of CPU power to encrypt the files. If you observe a noticeable fall in computer power or notice a unknown process in the Process Manager, you should switch off the computer, start it in safe mode, and search for threats. Naturally, the certain amount of files will be damaged, but you will secure the other part.
    • Carefully inspect your mailbox, specifically those messages that have files attached to them. The #1 model of fraud messages is the notification about prize gaining or parcel receiving. The second most effective kind of scam letters is a "business letters". Invoices for products or services, summaries, lawsuits, complaints and similar specific files do not be sent accidentally, and the addressee should know the person who sent it. In most of the cases it is a fraud.

Kolz deletion isn't the happy end - it's only a one turn from many until the complete file restoration. To recover the data you should follow the tips in the below section of this article. In case of encrypting virus we do not publish the hand deletion instruction, since its complication and the probability of faults will be very high for regular customer. We don't advise trying to delete ransomware in manual mode, because it has numerous protection features that will counteract you. The very common ransomware defensive manner is the uninstalling of files in event of file decryption or Kolz removal attempt. To avoid this, follow the advices under this paragraph.

Removal instruction

Step 1. Boot into Safe mode

Safe mode

Start -> Msconfig.exe

Safe mode. Step 1

On the tab Boot select Safe boot

Safe mode. Step 2

Step 2. Check Startup folder

Start -> Msconfig.exe ->Disable unknown programs in the Startup tab


Step 3. Check hosts file

Modify hosts file, that located in C:\Windows\System32\drivers\etc\ .

Hosts file.Step 1

Open the file with Notepad and delete suspicious strings.

Hosts file.Step 2

It has to look like this:

Hosts file.Step 3

Step 4. Scan the system with antiviral scanner

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Step 5. Disable Safe mode

Start -> Msconfig.exe ->Disable Safe boot in the Boot tab

Deactivate Safe mode

If you made all conditions, mentioned in above paragraph - it's time to restore the files. Actually, this is not about decipherment, since the encryption algorithms used by scammers are too complex. There are the lucky exceptions, but usually file restoration requires lots of time and efforts. If you are more interested in the by-hand information restore - read our item, which describes all the easiest ways.

To restore information, follow the article about files decryption.

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