How to uninstall Sdkkxbh ransomware from a computer?

Also Known As: Sdkkxbh virus
Distribution: Low
Damage level: Severe

Sdkkxbh ransomware removal instructions

What is Sdkkxbh?

Sdkkxbh is a part of Snatch ransomware family, it was discovered by Joakim Kennedy. Like most programs of this type, this ransomware encrypts files, modifies their filenames and provides victims with instructions on how to contact its developers (creates a ransom note). Sdkkxbh renames encrypted files by appending the ".sdkkxbh" extension to their filenames. For instance, it renames "1.jpg" to "1.jpg.sdkkxbh", "2.jpg" to "2.jpg.sdkkxbh", etc. It drops the "HOW TO RESTORE YOUR FILES.TXT" ransom note in every folder that contains encrypted files.

As explained in the "HOW TO RESTORE YOUR FILES.TXT" ransom notes, only cyber criminals behind Sdkkxbh ransomware can help victims to decrypt their files. To get instructions on how to do that it is required to send an email to with the extension that was appended to the encrypted files (in this case ".sdkkxbh") in it. Victims are encouraged to write that email in 48 hours after Sdkkxbh attack, otherwise data may be lost permanently. Also, it is stated that any attempts to modify encrypted files may damage them irreversibly. Sdkkxbh's victims are offered a free decryption of three files (except databases, Excel documents and backups), those files can be sent to cyber criminals via the aforementioned email address. It is common that cyber criminals behind a certain ransomware are the only ones who have tools that can decrypt files encrypted by that ransomware. Unfortunately, that is the case with Sdkkxbh ransomware too. However, it is recommended not to trust its developers (pay them a ransom/purchase a decryption tool from them). Quite often victims who pay a ransom get scammed - they do not receive any decryption software and/or key even after a transaction. As a rule, the only way to recover files for free in such cases it to restore them from a backup. It is worthwhile to mention that if some files were not encrypted by ransomware, they can be prevented from being encrypted by uninstalling it from a computer. Unluckily, encrypted files remain encrypted even when ransomware is no longer installed.

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

Sdkkxbh decrypt instructions (HOW TO RESTORE YOUR FILES.TXT)

More examples of malware like Sdkkxbh are VIVELAG, Space and !Shadow. What most of them have in common is that they encrypt files, changes their filenames and create and/or display a ransom note. Two most common and main differences are price of a decryption/size of a ransom and encryption algorithm (symmetric or asymmetric) that ransomware uses to encrypt files. In one way or another, most of the times victims cannot decrypt encrypted files without having to use tools that can be provided only by cyber criminals who designed ransomware. Free decryption is possible only when ransomware is not finished, has bugs, flaws, etc. Since it happens rarely, it is recommended to always have data backed up and store it on unplugged storage device or some remote server (e.g., Cloud).

How did ransomware infect my computer?

Usually computers get infected with ransomware and other malware spam campaigns, Trojans, untrustworthy software download channels, fake software updaters or unofficial activation ('cracking') tools. It is common that cyber criminals attempt to spread malware by sending emails that contain malicious attachments or website links. Usually they attach files such as malicious MS Office documents, executable files (like .exe), archive files like RAR, ZIP, PDF documents or JavaScript files. Their main goal is to deceive recipients into executing malicious files that are designed to install malware (e.g., ransomware). Another way to proliferate such software is through Trojans. Trojans are malicious programs that often are designed to install other software of this kind. However, they can cause chain infections only when they are installed on a computer. Various untrustworthy file and software download channels, sources can be used to deceive users into installing malware too. Some examples of such channels are Peer-to-Peer networks (e.g., torrent clients, eMule), freeware download, free file hosting websites, unofficial pages, third party downloaders. Malicious programs get installed when users open/execute malicious files that were downloaded through them. It is common that those files are disguised as regular, legitimate. Fake software updaters infect computers by exploiting bugs, flaws of some outdated software or by installing malware instead of fixes, updates. Unofficial activation ('cracking') tools are programs supposed to illegally activate licensed software (bypass its activation). Although, users who attempt to activate programs through them often cause installation of malicious programs instead.

Threat Summary:
Name Sdkkxbh virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .sdkkxbh
Ransom Demanding Message HOW TO RESTORE YOUR FILES.TXT
Cyber Criminal Contact
Detection Names Avast (Win64:Trojan-gen), BitDefender (Gen:Variant.Ransom.GoRansom.2), ESET-NOD32 (A Variant Of Win64/Filecoder.BL), Kaspersky (HEUR:Trojan-Ransom.Win32.Gen.vho), Full List Of Detections (VirusTotal)
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 payment of a ransom (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.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
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How to protect yourself from ransomware infections?

It is common that cyber criminals disguise their emails as official. Although, if there is any reason to suspect that an email cannot be trusted (could be used to distribute malware) then its contents should be left unopened. This applies mostly to attachments and website links in irrelevant emails that are received from unknown, suspicious addresses. Files and programs should be downloaded only via direct links and from trustworthy, official websites. Other channels, tools like third party downloaders (and installers), Peer-to-Peer networks, unofficial pages, etc., should not be trusted. Installed software must be updated and activated only with tools and/or implemented functions that are designed by official software developers. Third party updating, activation tools can be (and often are) designed to spread malicious programs. Also, it is not legal to activate any licensed software with 'cracking' (unofficial activation) tools. Operating system should be regularly scanned for threats with a reputable antivirus or anti-spyware suite. Any detected threats should be removed as soon as possible. If your computer is already infected with Sdkkxbh, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text presented in Sdkkxbh ransomware's text file ("HOW TO RESTORE YOUR FILES.TXT"):

Hello! All your files are encrypted and only I can decrypt them.

Contact me:


Write me if you want to return your files - I can do it very quickly!
The header of letter must contain extension of encrypted files.
I'm always reply within 24 hours. If not - check spam folder, resend your letter or try send letter from another email service (like



Do not rename or edit encrypted files: you may have permanent data loss.


To prove that I can recover your files, I am ready to decrypt any three files (less than 1Mb) for free (except databases, Excel and backups)


! ! ! If you do not email me in the next 48 hours then your data may be lost permanently ! ! !

Screenshot of files encrypted by Sdkkxbh (".sdkkxbh" extension):

Files encrypted by Sdkkxbh ransomware (.sdkkxbh extension)

Sdkkxbh ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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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 Sdkkxbh 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 Sdkkxbh 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 Sdkkxbh 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 Sdkkxbh 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 Sdkkxbh, 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 Sdkkxbh 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, and 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 Sdkkxbh 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 since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

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Malware activity

Global malware activity level today:

Medium threat activity

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

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