Remove Cetori Ransomware Virus

The Cetori file extension is actually caused by an undesirable data modification by the ransomware virus whose main goal is to lock the user’s files and the attackers themselves are ready to provide the tool for its recovery. Sadly, the solution from Cetori ransomware developers are not inexpensive. The cost of private key and tool software is costly $980. Otherwise, all .cetori files will remain useless without this decryption program.

The approach being applied by the cyber crooks to refuse users access to their own files is the application of a single encryption technique, which from that moment on, only the makers of Cetori ransomware knows the cipher to decrypt them. Since these attackers know that the files are very important to the victims, they are going to use the situation to extort money urgently. Moreover, the assailants are aware that the victims do not have any other resources to retrieve the encrypted files and some of them will resort to pay the ransom request, especially if the victim needs to access the files in no time.

Computer security experts denounce this easy but expensive way of dealing with ransomware infections. The point is, the attack will persists if these cyber crooks realizes the potential revenue stream they may generate from spreading crypto-virus like Cetori.

Image of Cetori infected files

Actually, there is an alternative way to recover files infected by Cetori ransomware including all variants from this family of STOP/DJVU. A tool called Emsisoft Decryptor is able to decrypt other versions from this group as Carote, Stare, Nuksus, and many more . However, the recovery is only limited to files that were encrypted using an offline key. Read more information about the free tool on the removal section below.

Technical Data of Cetori Ransomware

Technical Details
Threat NameCetori Ransomware, Stop, DJVU
Threat TypeCrypto-virus, File Locker, Encryption Virus
File Extension.cetori
Ransom Amount$490 – $980
Ransomware Note File_readme.txt
Discovered by@demonslay335
Virus AliasAegisLab : Trojan.Win32.Generic.4!c
Avast : Win32:Malware-gen
AVG : Win32:Malware-gen
Avira : TR/AD.InstaBot.bbb
BitDefender : Trojan.GenericKD.32294386
Comodo : Malware@#3v5hkp3xa9paz
DrWeb : Trojan.Encoder.26996
Emsisoft : Trojan.GenericKD.32294386 (B)
ESET-NOD32 : A Variant Of Win32/Kryptik.GVSY
F-Secure : Trojan.TR/AD.InstaBot.bbb
Fortinet : W32/Kryptik.GWIV!tr
Kaspersky : HEUR:Trojan.Win32.Generic
Malwarebytes : Ransom.Stop
McAfee : Trojan-FRJR!8A9B5893C782
Microsoft : Trojan:Win32/Gandcrab.AF
Panda : Trj/GdSda.A
Sophos : Mal/GandCrab-H
Symantec : Packed.Generic.525
TrendMicro : Ransom_Stop.R020C0PHM19
VIPRE : Trojan.Win32.Generic!BT
ViRobot : Trojan.Win32.Z.Genkryptik.490496.A
Webroot : W32.Malware.Gen
ZoneAlarm : HEUR:Trojan.Win32.Generic

For complete details including full detection list, hash file, file names, and technical behavior (registry actions, shell commands, and processes) of Cetori ransomware, please refer to this VirusTotal page.

Backup your files

One important step before proceeding with the procedures below is to backup your files. Ransomware are not the same. Each has its unique sets of payloads aside from encrypting the files with complex method. Others tend to delete the infected files after certain period, while others keep them concealed on hidden places. In addition, ransomware decryption tools are not guaranteed to be perfect, there are instances that files suffer from damages during the decryption process.

So, create a backup copy of your entire Cetori encrypted files right now.

Cetori Ransomware Removal Guide

First thing to do is remove the Cetori virus before attempting the decryption. Remember that as long as the ransomware is active, it will repeatedly encrypt the files on the compromised computer.

Infection of Cetori ransom virus is dangerous to the system because it can inject files that runs each time Windows starts. To prevent the malicious files from loading, Windows operating system must run with minimal process and it can be done through SafeMode With Networking.

Stage 1 : Temporarily Disable System Restore on Windows OS

Because Cetori and relevant virus is capable of reinstating itself by exploiting the System Restore of Windows, we suggests that you temporary disable System Restore while executing the steps. This option is also helpful to effectively run a full scan on the computer.

Do not forget to enable back System Restore after completing the removal of Cetori ransomware. This feature is vital in reinstating the operating system to previous normal working condition in case of problems or conflicts occurs.

Stage 2 : Start Windows in Safe Mode With Networking

Windows 10 Guide

1. Click on Windows logo and select Power icon when options pop-ups.
2. Select Restart from the options while pressing Shift key on the keyboard.
3. Choose an Option window will appear, select the Troubleshoot button.
4. On next window, please choose Advanced Option.
5. On Advanced Option window, click on Startup Settings and then, click Restart button to reboot the computer.
6. When Windows boot on Startup Settings, press function key F5 or number 5 on keyboard.

A simpler alternative for Windows 10 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Windows 8 Guide

1. Click Windows Start icon at the lower left section of the screen.
2. Open Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup and then, click on Restart Now button.
4. Once the computer starts in Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings and then, click Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Stage 3 : Scan the Computer with Sophos Antivirus

Ransomware files are placed deeply into the system and on various locations, thus, thorough scanning is vital to totally remove Cetori virus. Aside from our suggested tool, you may also run your own security program.

To remove Cetori automatically, scanning the computer with this efficient anti-malware tool is suggested. This scanner does not just uncover known threats like viruses or malware, it is also effective in discovering hazardous ransomware like Cetori.

1. Download Sophos Virus Removal Tool from the link below. Save the file on your computer where you can easily access it.

2. Once the download completes, browse the location of the file. Double-click to run the program and begin the install process.

Screnshot of Sophos Installer

3. On first windows of installation wizard, click Next to continue. Then, it will display the program’s License Agreement. You need to Accept the terms in order to proceed. If Windows prompts for User Account Control, please click Yes to proceed.

Screenshot of Sophos EULA Page

4. On succeeding windows, click Next or Continue to carry on with the installation. After completing the installation process, Launch Sophos Virus Removal Tool.

5. Internet connection is required when running this virus scanner in order to download important updates. Make sure that everything is up-to-date to effectively remove Cetori ransomware and other relevant viruses.

6. Click the Start Scanning button to inspect the computer. This will check the system for presence of malicious objects, malware, and viruses. The tool reveals items that were found linked to Cetori and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

The above procedures should have totally eliminated Cetori ransomware. However, if you found that there are still remnants of the virus, please proceed to succeeding procedures below.

Stage 4 : Double-check with Microsoft's Malicious Software Removal Tool

1. Download the free scanner called Malicious Software Removal Tool.

Download MSRT

2. The tool automatically checks the operating system and suggest appropriate download version. Click on Download button to begin. Save the file to a convenient location, preferably on Desktop.

3. After downloading the file, Windows will prompt that download has completed. Click Run to start scanning for Cetori ransomware. Another option is to browse the location folder and double click on the file to run.

MSRT Icon

4. The tool will display Welcome screen, click Next. Please note the message "This tool is not a replacement for an antivirus product." You must understand that this program is made specifically to find and remove malware, viruses, Trojans, and other harmful elements on the computer. It was not designed to protect the computer.

MSRT Welcome

5. Next, you will see Scan Type. Please choose Full Scan to ensure that all Cetori ransom virus entities and other harmful files left on the computer will be found and removed. For advanced computer user, you can opt for Customized Scan, if there are other drives or folders you wanted to include in this scan.

MSRT Scan

6. Full scan may take a while, please wait for Malicious Software Removal Tool to complete the tasks. However, you may cancel the scan anytime by clicking on the Cancel button.

MSRT Scan

7. After scanning, the tool will reveal all identified threats. There may be other threats that our first scan fails to detect. Please remove/delete all detected items.

8. When removal procedure is complete, you may now close Malicious Software Removal Tool. We hope that Cetori ransomware have been completely deleted from the computer. Please restart Windows to proceed with the normal operation.

Recover Files from Cetori Ransomware Infection

On this section, we will provide ways to decrypt files infected with Cetori ransomware. Aside from dedicated decryption software and common tools, other options for file recovery are provided. As much as we can, we will update this area whenever there is new and more suitable decryption tool was made available.

Decrypting Cetori infected files with Emsisoft Tools

This service from Emsisoft is helpful in unlocking encrypted files without paying the ransom. It gives three ways to detect the ransomware and provide suitable recovery method:

Upload ransom note – This is usually the .txt or .hta files that was generated by Cetori ransomware.

Upload the encrypted file – The actual encrypted file. Choose the one that is less than 8MB in size.

Contact information – Enter the email address or any links provided as it appears in the ransom note of Cetori virus.

Emsisoft Tools

After submitting any of the appropriate data, Emsisoft will attempt to identify the ransomware and provide keys if there are available.

Option 1: Windows Previous Version Tool

Windows Vista and Windows 7 have a feature called Previous Versions. However, this tool is only usable if restore point was made prior to ransomware infection. To use this tool as "recovery option" for files encypted by Cetori virus, please follow these steps:

1. Open My Computer or Windows Explorer.

2. Right-click on the affected files or folders. From the drop-down list, please click on Restore previous versions.

3. New window will open display all backup copy of files and folders you wanted to recover. Choose the appropriate file and click on Open, Copy, or Restore. Restoring selected files overwrites the current locked files on the computer. The tool is not actually recovering files encrypted by Cetori. Instead, it restores files from backup copy.

Option 2: Use ShadowExplorer to restore files encrypted by Cetori Ransomware

Just like Previous Version tool, ShadowExplorer is taking advantage of shadow copy created by Windows. This tool allows you to retrieve older version of files before it was encrypted by Cetori ransomware.

1. Download ShadowExplorer from the official web site.

2. Install the program with the default settings.

3. The program should run automatically after installation. If not, double-click on ShadowExplorer icon.

4. You can see the drop-down list on top of the console. Please select proper drive and the most recent point-in-time shadow copies of files you wish to restore prior to Cetori ransomware infection.

shadow3

5. Right-click on the Drive, Folder, or File you wish to restore and click Export...

6. Lastly, ShadowExplorer will prompt for location where you want to save the copy of recovered files.

How to protect the computer from Cetori ransomware?

After the removal of the ransomware, it is important to prevent similar incident from happening again. In order to protect the computer effectively, computer user must know how Cetori ransomware was able to infect the computer. To minimize the possible infection, staying away from the common sources of this virus is crucial.

How Cetori ransomware can infect your computer?

The method of infecting the computers was found to be similar as other common viruses. Though, ransomware like Cetori is seen to have efficient deployment via spam email messages, web injectors, malicious software installers, misleading online advertisements, and through another virus infection.

Once the virus is executed, it immediately infects the system. Then, Cetori ransomware communicates to remote server so that unique key can be generated for the specific computer. After acquiring the key, it starts to decrypt target files using a complex method that is almost unbreakable. On the last stage of the attack, Cetori ransomware demands for ransom money as payment for the decryption tool. To further understand the attack scheme, we have included an infographic below.

Infographic image of ransomware attack stages
You can print, download, or share the infographic by clicking the image.

Securing the computer against ransomware attack

Do a Regular File Back-up - Always backup your data on a separate storage devices such as external hard drives, optical discs, or online backup services.

Keep Your Software Updated - Make sure that you have the latest software updates especially on the operating system. Recent updates often contain vital security patches to help protect the computer against all forms of threats.

Install a Security Program - Protect the computer with effective anti-virus application using efficient real-time scanning. Regularly run a complete scan to check the computer for presence of malware.

Protect your files with Controlled Folder Access (Windows 10)

For Windows 10 users, aside from protecting the computer using anti-virus or anti-malware programs, one way to protect against ransomware attack is by using Controlled Folder Access. This feature of Windows Defender Security Center may not prevent the Cetori ransomware infection, but it can protect the folder and files in general. Follow the steps to enable Controlled Folder Access in Windows 10.

1. Go to Windows 10 Taskbar and search for Windows Defender Security Center.

2. Open Windows Defender Security Center and click on Virus & Threat Protection icon.

Virus and Threat Protection

3. On next window, please click on Ransomware Protection.

4. Under Controlled Folder Access section, switch the slider to On. That will enable the feature and protect the folder against Cetori or any type of ransomware.

Controlled Folder Access

5. Click on Protected Folderslink to include additional folders. Make sure that folders where important files are located should be included in the list.

Add Protected Folder

Troubleshooting Guide

Certain programs maybe blocked by Controlled Folder Access feature. To fix the issue, simply have the specific program to be white listed.

1. Under Protected Folders, click Allow an app through controlled folder access.

2. Next, click the Add an allowed app and include the target executable file.

This Controlled Folder Access feature is one way to protect files against Cetori. Other important things to do in keeping files safe against ransomware is through early prevention like keeping programs updated, install an efficient security program, an do regular file backup on a separate media drive.

About the author

2 thoughts on “Remove Cetori Ransomware Virus”

  1. Hello,

    Today my system was infected with ransomware (.hese extension) and all my word, excel, pdf and jpg files were encrypted. Please let me know whether you have a specific tool to recover all these type of files. If I simply follow the above mentioned steps, will that work in my case? I am looking forward to hear from you soon.

    Kind regards,

    Basil

  2. Sir,
    My files are corrupted by .cetori virus.
    I already reset my Windows. Can I still get my files back?

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