How to remove Cezar virus and restore encrypted files

Cezar ransomware virus

Cezar ransomware had penetrated many computers in different parts of the world via basic method: scam messages with viral attachments. Sometimes web-criminals use zero-day vulnerabilities to get into the system, but well-known software developers quickly fix them. When infection takes place, ransomware examines the computer memory to find the folders for encryption and their rough cost. Nowadays, any modern virus knows how to cypher video, image, audio and text information in all popular formats. Cezar corrupts all files, but those that could be business records go first. All programs on hard drive will be untouched since fraudsters want only information. Encryption is performed through famous RSA and AES algorithms, and it is so sophisticated that that decryption of data with no key is impossible. Such complexity is the root for impressive success of ransomware in last years: an ordinary user, even if he has a pretty high knowledge of the computer, won't ever get back the data, and will have to pay the price. The sole method to decrypt the information is to crack the scam webpage and get the encryption keys. Also there's a way to withdraw encryption keys due to defects in the code of the virus itself.

This article is about Cezar virus that gets into computers in diverse countries of the world, and cyphers the files. In this article you can find important info about what is Cezar, and how to remove Cezar from the machine. Except that, we'll explain how to get back the cyphered files and is it possible.

The knowledge of computers is quite significant in progressive world, since it assists you to guard the system from computer viruses. For encrypting viruses it's very important, as, unlike most undesired software, when you uninstall ransomware from the PC, the consequences of its actions will stay. You easily can minimize the chances to get encrypting virus by following these rules:

    • Monitor the status of your computer. Data encryption is a sophisticated operation that needs a large amount of PC resources. When the malware starts to work, the CPU speed decreases, and the encryption process appears in Process Manager. You may catch this moment and shut down the workstation before files will be fully damaged. This, in case of infection, will protect a lot of your data.
    • Be cautious with the messages which contain files. If this message was sent from an unknown address and it tells about obtaining any prize, a lost parcel or anything like that, this is most likely ransomware. The other common kind of fraud messages is a "business letters". claims, lawsuits, summaries, Invoices for goods or services and suchlike sensitive files don't be sent accidentally, and the addressee should know the person who sent it. Otherwise, it is a scam.
    • Heed to the pop-up windows. If the PC is infected by ransomware, it will endeavour to eliminate all copies of the files, to make the decryption impossible. Anyway, deleting of copies needs admin rights and verification from the operator. If you'll stop for few seconds before confirming the checkbox, it may save your data and your efforts.

Virus elimination is not the happy end - it's just a first move on the long road before the total file recovery. If you delete Cezar, you will not return the files instantly, it will demand multiple actions described in the "How to restore encrypted files" section. In case of ransomware we don't provide the hand deletion guide, because its complication and the probability of faults appears to be very high for regular customer. We don't suggest trying to remove Cezar by hand, since it has numerous protection mechanisms which could interfere you. Modern encrypting viruses can completely delete cyphered information, or part of it, when trying to uninstall the virus. To avoid this, follow the instructions below.

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

After removing Cezar from the PC, you just need to decrypt the polluted data. Actually, this is not literally decryption, as the encryption algorithms used by web-criminals are too complex. Usually, to restore the information, the customer has to ask for assistance on targeted communities or from renowned malware researchers and antiviral program manufacturers. If you don't want to wait and are willing to recover the data by hand - here's the complete article on data recovery.

To restore information, follow the article about files decryption.

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