Chech Ransomware

Also Known As: Chech ransomware
Distribution: Low
Damage level: Severe

Chech ransomware removal instructions

What is Chech?

Cyber criminals use Chech to encrypt data stored on computers and blackmail people by making ransom demands. This malicious program is categorized as ransomware and belongs to the Djvu ransomware family. Discovered by Michael Gillespie, Chech generates a ransom message ("_readme.txt" file) and places it in each folder that contains encrypted files. Additionally, it renames each encrypted file by adding the ".chech" extension. For example, "1.jpg" becomes "1.jpg.chech".

Chech's developers state that they used this ransomware to encrypt all files (photos, databases, documents, and other data) and the only way to recover them is to purchase a decryption tool. As 'proof' that they have this tool, they offer free decryption of one file, which can be sent to them via the blower@india.com or blower@firemail.cc email address. These should also be used to contact them for instructions about how to pay for a decryption tool. The ransom message states that this tool costs $980, however, if contacted within 72 hours after encryption, Chech's developers will make a discount and drop the cost to $490. Note that most people who trust cyber criminals/ransomware developers are scammed. They receive no decryption tools even if they have paid the ransom. Typically, people who develop ransomware-type programs ignore victims after ransoms are met. These programs encrypt data using cryptography algorithms (symmetric or asymmetric) that make decryption without using a specific tool impossible. To obtain a decryption tool, users are encouraged to contact ransomware developers who demand payment. Typically, the only free option in such cases is to use a backup and restore files from there.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Chech decrypt instructions

Chech is just one of many ransomware-type programs available online. Most are very similar and are used for two main purposes: to encrypt data and make ransom demands. Cryptography algorithm used to encrypt files and cost of tool capable of decrypting them are usually the main differences. In all cases, there is no way to decrypt files without the involvement of cyber criminals who developed the ransomware. Decryption without using their tools is possible only if the ransomware is not fully developed or has bugs/flaws. Therefore, we recommend that you create regular backups and keep them on unplugged storage devices and remote servers. Some examples of other ransomware-type programs are P3rf0rm4, Luces, and Metan.

How did ransomware infect my computer?

There are a number of common ways by which computers become infected with ransomware-type program such as Chech. Cyber criminals proliferate them through spam campaigns, fake software updaters tools, untrustworthy software download sources, Trojans and software 'cracking' tools. They proliferate ransomware-type programs via spam campaigns by sending emails that contain malicious attachments. These attachments are usually Microsoft Office documents, PDFs, RAR, ZIP, and other archives, JavaScript files, executables (.exe) and other files. People are tricked into opening these attachments, since cyber criminals present the emails as legitimate an official. Opening attached files (or web links that lead to them) results in downloading and installing ransomware-type and other malicious programs. Computers are also infected through fake software updaters. These tools exploit bugs/flaws of installed and outdated software, or simply download malware rather than the expected updates or fixes. P2P (peer-to-peer) networks such as eMule, torrent clients, third party downloaders, unofficial pages, freeware download and free file hosting websites, and other sources can be used to present malicious executable files (.exe) as legitimate, regular files. When people download and open them, they cause computer infections. Trojans are malicious programs that, when installed, download and install other malicious programs. In summary, these programs cause chain infections. Software 'cracking' tools can be the reason behind various computer infections. Rather than activating software free of charge, they download and install ransomware or other malicious programs.

Threat Summary:
Name Chech ransomware
Threat Type Ransomware, Crypto Virus, Files locker.
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand a ransom payment (usually in Bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.
Removal

To eliminate Chech ransomware our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

Handle received emails with care, especially if they are sent from unknown addresses and contain attachments (or web links). Rogue emails are usually irrelevant and should be ignored. Furthermore, download software using official websites and direct links. Do not use other third party tools mentioned above. Software updates should be downloaded and installed using tools and implemented functions provided by official software developers. Use of software 'cracking' tools is a cyber crime and they often cause computer infections - do not trust or use these tools. Have a reputable anti-virus or anti-spyware suite installed and ensure that it is enabled. These tools can detect and remove computer infections early. If your computer is already infected with Chech, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Chech ransomware text file ("_readme.txt"):

ATTENTION!

Don't worry my friend, 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:
https://we.tl/t-W8DuFk4wwu
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" folder if you don't get answer more than 6 hours.


To get this software you need write on our e-mail:
blower@india.com

Reserve e-mail address to contact us:
blower@firemail.cc

Your personal ID:
-

Screenshot of files encrypted by Chech (".chech" extension):

Files encrypted by Chech

As with most of ransomware from the Djvu family, Chech also displays a fake Windows update pop-up during the encryption:

Djvu ransomware family fake update

IMPORTANT NOTE! - As well as encrypting data, ransomware-type infections from the Djvu malware family also install a trojan-type virus called AZORult, which is designed to steal various account credentials. Furthermore, this malware family is designed to add a number of entries to the Windows hosts file. The entries contain URLs of various websites, most of which are related to malware removal. This is done to prevent users accessing malware security websites and seeking help. Our website (PCrisk.com) is also on the list. Removing these entries, however, is simple - you can find detailed instructions in this article (note that, although the steps are shown in the Windows 10 environment, the process is virtually identical on all versions of the Microsoft Windows operating system).

Screenshot of websites added to Windows hosts file:

Tro Ransomware adding websites to Windows Hosts file

Chech ransomware removal:

Instant automatic removal of Chech ransomware: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of Chech ransomware. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the Chech virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Chech ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Chech ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Chech are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by Chech, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Chech ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the Documents, Pictures, Videos, Music, Favorites as well as Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove Chech ransomware:

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global virus and spyware activity level today:

Medium threat activity
Medium

Increased attack rate of infections detected within the last 24 hours.

QR Code
Chech ransomware QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Chech ransomware on your mobile device.
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Platform: Windows

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