Protect systems from Kokoklock ransomware attacks

Also Known As: Kokoklock virus
Distribution: Moderate
Damage level: Severe

Kokoklock ransomware removal instructions

What is Kokoklock?

Kokoklock is a software which is categorized as ransomware, this malicious program was discovered by GrujaRS. Ransomware-type programs encrypt files with strong encryption algorithms. To be able to access their files victims are forced to buy a decryption tool or/and key from cyber criminals who designed ransomware. Kokoklock renames all files by adding an email address and a random extension to their filenames. For example, it renames a file named "sample.jpg" to "sample.jpg.mailto[].1a9296" and so on. The name of a ransom note is same as the extension added to all encrypted files. In this case a ransom note would be named "1A9296-Readme.txt".

According to cyber criminals (their ransom note), Kokoklock encrypts all files. To get instructions on how to decrypt them and/or pay a ransom, victims have to write Kokoklock developers an email to or The email must include a personal ID/personal code which is appointed to every victim individually. This code can be found at the bottom of the ransom note. Additionally, victims can attach one file that cyber criminals will decrypt for free. Typically, cyber criminals who designed a particular ransomware are the only ones who can decrypt files that were encrypted with their ransomware. Unfortunately, that is the case with the Kokoklock ransomware. Programs of this type lock files using strong encryptions that usually are impossible to 'crack. However, cyber criminals should not be trusted, there is always a high possibility that they will not send decryption tools or/and keys even if they are paid. In other words, there is a high chance that people who will trust them may get scammed. As a rule, the only free way to recover lost files is to restore them from a backup.

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

Kokoklock decrypt instructions

Kokoklock is similar to other programs of this type such as .cmd, Peta, Shariz and many others. Most of the times programs of this type are designed to prevent victims from accessing their data and so that cyber criminals could force them to pay a ransom (buy decryption software and/or keys from them). Two main variables usually are price of a decryption (ransom size) and cryptographic algorithm (symmetric or asymmetric) that is used to encrypt data. Typically, decryptions without a help of cyber criminals is impossible, unless ransomware is not finished, has bugs, flaws, and so on. To avoid data and possible monetary loss in the future we recommend to have data backed up and keep it on a remote server like Cloud or some unplugged storage device.

How did ransomware infect my computer?

There are various ways to spread ransomware and other malware. Typically, cyber criminals do it using spam campaigns, software 'cracking' tools, Trojans, unofficial software updaters and untrustworthy software download channels. When cyber criminals use spam campaigns, they send emails that include attachments (or web links that lead to infected files). These files usually are PDF or Microsoft Office documents, JavaScript or executable files, archives like RAR, ZIP and so on. Typically, they disguise their emails and attachments as important, official and so on, and hope that recipients will open them. When opened, these files install one or another high-risk malware. Furthermore, software 'cracking' tools usually are expected to activate paid software or operating system for free. Nevertheless, quite often it is not what these tools do. Very often they simply install some malicious program. Another way to spread malware is through Trojans: these programs (if installed on a system), cause chain infections. In other words, they download and install other malicious software. People who use untrustworthy software download sources such as Peer-to-Peer networks (torrent clients, eMule), freeware download or free file hosting websites, third party downloaders and other similar tools, often infect systems by themselves. Quite often they download malicious files that are disguised as harmless. When they open them, they install malware. Fake software updaters usually infect computers when they download and install malicious programs instead of updates or exploit bugs, flaws of some outdated software that is installed on the operating system.

Threat Summary:
Name Kokoklock virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension Kokoklock adds a random extension
Ransom Demanding Message Email address and a string of random characters
Cyber Criminal Contact,
Detection Names Avira (TR/Crypt.XPACK.Gen), BitDefender (Gen:Trojan.Heur.FU.euW@aqmXl0f), ESET-NOD32 (A Variant Of Win32/Filecoder.NXP), Kaspersky (Trojan.Win32.DelShad.aqi), Full List Of Detections (VirusTotal)
Symptoms Can't open files stored on your computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demanding message is displayed on your desktop. Cyber criminals are asking to pay a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads, unofficial software activation or updating tools.
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.

To eliminate Kokoklock virus 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?

It is important not to open attachments that are included in emails received from unknown/untrustworthy addresses. As a rule these emails are presented as official, however, they are not relevant to their recipients. To safely update installed software, it is important to use implemented functions or tools that are provided by official developers. Files or programs should not be downloaded from untrustworthy and unofficial websites, third party downloaders and other channels as sources. The Safest way to download it to use official websites and direct download links. Software 'cracking' often infect systems with various malware and are illegal. It is not recommended to activate any programs with them. One more important thing is to scan the operating system for viruses regularly and do it with a reputable anti-virus or anti-spyware software. If your computer is already infected with Kokoklock, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Kokoklock ransomware's text file:

What happen ?

Your files are encrypted, and currently unavailable.
You can check it: all files on your computer has expansion 1a9296.
By the way, everything is possible to recover, but you need to follow our instructions.
Otherwise, you cant return your data.

What guarantees?

Its just a business. We absolutely do not care about you and your deals, except getting
benefits. If we do not do our work and liabilities - nobody will not cooperate with us.
Its not in our interests.
To check the ability of returning files, you should write to us by email.
There you can decrypt one file for free. That is our guarantee.

How to contact with us ?

Email us:

Be sure to include your personal code in the letter:

Screenshot of files encrypted by Kokoklock (random extension):

Files encrypted by Kokoklock

Kokoklock ransomware removal:

Instant automatic removal of Kokoklock virus: 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 Kokoklock virus. 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 Kokoklock 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 Kokoklock 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 Kokoklock 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 Kokoklock 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 Kokoklock, 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 Kokoklock ransomware.

Note that Windows 10 Fall Creators Update includes "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default this feature automatically protects files stored in 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's more information on how to get this update and add 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 Kokoklock 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.

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

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

QR Code
Kokoklock virus 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 Kokoklock virus on your mobile device.
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Platform: Windows

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