.chech Files Virus (STOP Ransomware) - How to Remove It
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.chech Files Virus (STOP Ransomware) – How to Remove It

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This is an article, created to explain what are .chech files and how to remove STOP ransomware virus and try to restore the .chech files, encrypted by it on your computer.

Another variant of STOP ransomware has been recently detected. The virus is from the cryptovirus type, meaning it infects your computer and then encrypts your files, creating the .chech file extension in the process. The encrypted files cannot be opened and this ransomware drops a _readme.txt ransom note file, which aims to extort you into transferring a ransom payment in the form of BitCoin cryptocurrency to the cyber-criminals who are behind it. If your computer was recently infected by the .chech ransomware, we strongly recommend that you read this article.

Threat Summary

Name.chech Ransomware
TypeRansomware, Cryptovirus
Short DescriptionCreated to encrypt valuable user files and then ask victims to pay ransom for a decryption tool.
SymptomsImportant files are locked and renamed with .chech extension. A ransom note file demands victims to pay hefty ransom to restore their files.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by .chech Ransomware

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Malware Removal Tool

User ExperienceJoin Our Forum to Discuss .chech Ransomware.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

.chech Files Virus – Distribution

The .chech file ransomware may perform different types f activities, the outcome of which may lead to infection. One of them may be to aggressively target your computer by sending you an e-mail, that is made in a very convincing way. The subjects of such e-mails are often similar to the following:

  • “Your payment has been declined.”
  • “Your purchase receipt.”
  • “Your invoice.”
  • “Your order is complete.”
  • “Suspicious activity on your Card.”

The file that is embedded in the e-mails themselves often turns out to be a malicious .js, .exe or .docx and .pdf type of file, whose primary purpose is to get the victim to download and run it, thinking it is a legit file. Once this is done, the infection with the .chech ransomware may commence.

In addition to this, another method of infection with .chech ransomware is to have the virus files uploaded online where they may pretend to be legitimate programs you are looking to download. Such programs can be:

  • License activators for software.
  • Cracks for software or games.
  • Patches.
  • Updates.
  • Key generators.

.chech Files Virus – More Information

When an infection with .chech ransomware takes place on the victimised computers, the virus may immediately begin dropping its payload files. The payload files could be dropped in the following Windows directories under different names:

In addition to this, the _readme.txt ransom note could also be dropped on victimised computer. The ransom note _readme.txt’s contents:

———————————————- ALL YOUR FILES ARE ENCRYPTED ———————————————–

Don’t worry, you can return all your files!
All your files documents, photos, databases 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 do we give to you?
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
Don’t try to use third-party decrypt tools because it will destroy your files.
Discount 50% available if you contact us first 72 hours.
—————————————————————————————————————————
To get this software you need write on our e-mail:
blower@firemail.cc
Reserve e-mail address to contact us:
blower@firemail.cc
Your personal ID:
[redacted 43 alphanumeric chars]

Besides the ransom note, the .chech variant of STOP ransomware could also do the following actions on the computers infected by it:

  • Create mutexes.
  • Perform privilege escalation.
  • Obtain files.
  • Obtain the IP address and MAC address from the infected computer.
  • Obtain saved passwords.
  • Install other malware.
  • Check victim PC’s region and language used.
  • Check if the ransomware is ran on this computer before and if so it may self-delete.

The .chech variant of STOP ransomware may also perform other activities on the victim PC, such as to modify multiple different registry entries on the computers of victims, like the Run and RunOnce sub-keys, where values could be added in order to create multiple different data objects in them that make files run automatically when you start Windows:

→ HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

The ransomware virus may begin to erase the shadow volume copies on the computers that have been infected by it. This may be done by executing a .bat (BATCH) file with a script of commands similar to the following:

→ sc stop VVS
sc stop wscsvc
sc stop WinDefend
sc stop wuauserv
sc stop BITS
sc stop ERSvc
sc stop WerSvc
cmd.exe /C bcdedit /set {default} recoveryenabled No
cmd.exe /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
C:\Windows\System32\cmd.exe” /C vssadmin.exe Delete Shadows /All /Quiet

.chech File Ransomware – Encryption Process

The .chech ransomware is no different than any other variant of STOP ransomware – the virus still aims to encrypt the files on your computer using the same Advanced Encryption Standard (AES) encryption algorithm and then sets the .chech file extension to the encrypted files:

Remove .luceq Virus (STOP Ransomware) and Attempt to Restore Files

The STOP ransomware version associated with .chech extension is a threat with highly complex code that plagues not only your files but your whole system. So you should properly clean and secure your infected system before you could regularly use it again. Below you could find a step-by-step removal guide that may be helpful in attempting to remove this ransomware. Choose the manual removal approach if you have previous experience with malware files. If you don’t feel comfortable with the manual steps select the automatic section from the guide. Steps there enable you to check the infected system for ransomware files and remove them with a few mouse clicks.

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Ventsislav Krastev

Ventsislav has been covering the latest malware, software and newest tech developments at SensorsTechForum for 3 years now. He started out as a network administrator. Having graduated Marketing as well, Ventsislav also has passion for discovery of new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management and then Network Administration, he found his passion within cybersecrurity and is a strong believer in basic education of every user towards online safety.

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