How to remove Jack virus and restore encrypted files

Jack ransomware virus

This entry is about ransomware called Jack that gets into users' systems around the world, and encrypts their data. In this entry you will see complete information about what is Jack, and how to uninstall Jack from the system. Furthermore, we will explain how to restore the cyphered files, if possible.

Jack is the dangerous program getting into computers mostly with help of Trojans and phishing e-mails. Occasionally hackers use exploits to penetrate the PC, but well-known program vendors quickly fix them. After penetration, ransomware examines the hard disc, determines the quantity of files to be cyphered and their rough price. Nowadays, each new ransomware knows how to encrypt image, text, video and audio information in all most used formats. Ransomware corrupts all folders, but those that might be business records go first. Jack targets only information, and doesn't touch the programs, so that the victim can use his PC to pay the ransom. Encryption is carried out through world-known encryption algorithms, and it is so complex that that it can't be bruteforced. Such complexity gives root for impressive effectuality of ransomware in last years: usual customer, even if he has a fairly good knowledge of the PC, won't ever decrypt the files, and will have no choice except paying the ransom. The single method to decrypt files is to find the scam site and withdraw the master key. Some experienced hackers can obtain the keys through defects in viruse's program code. The encrypted files acquire .Jack extension without name changing, and requires around 490$ as a ransom.

The computer knowledge is very substantial in our century, as it helps you to defend the computer from hazardous software. Unfortunately, most people comprehend the importance of computer knowledge only when ransomware takes over their computers. To protect your information, you must understand these few elementary regulations:

    • Pay attention to the pop-ups. The simplest way of information restoration is the recovery from Shadow Copies, and fraudsters have added the elimination of shadow copies in the basic functionality of viruses. The deleting of shadow copies requires admin rights and user's verification. Thus, not accepting alterations from a weird program at the right time, you will reserve the chances to decrypt all lost files for free.
    • Monitor the performance of your machine. It consumes much of CPU power to encrypt the data. When the virus starts to work, the CPU speed decreases, and the encrypting process emerges in Process Manager. You may recognize this moment and switch off the PC before data will be fully spoiled. This, if the PC is really infected, will guard some of your data.
    • Closely inspect your emails, especially those messages that have attached files. The most efficient pattern of scam messages is the notification about prize gaining or package receiving. The second most efficient kind of fraud messages is a "business messages". It is natural to be interested and click on the letter even if it is obviously not for you, but don't forget that a single click on the attached file might cost you a lot of time, efforts and money.

Jack deletion is not answer to the whole issue - it's just a one move from many before the total file restoration. To decrypt the data you should read the instructions in the following paragraph of this entry. To deelete the malware, you have to load the machine at safe mode and run the scanning via antivirus program. Some viruses can't be uninstalled even with help of antivirus-tool, and have lots of effective mechanics of defense. Modern malware are able to fully remove encrypted information, or part of it, if somebody attempts to delete the program. This is extremely unwanted, and the following paragraph will assist you to cope with it.

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 performed all actions, described in above paragraph - it's time to recover the files. Actually, this is not literally decryption, as the encrypting methods used by web-criminals are extremely complex. Usually, to recover the data, you should seek support on targeted communities or from famous malware researchers and antivirus program manufacturers. If you are very interested in the manual information restore - read this article, which describes all the safest manners.

To restore information, follow the article about files decryption.

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