Protect systems from Kokoklock ransomware attacks

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

Kokoklock ransomware removal instructions

What is Kokoklock?

Kokoklock is software categorized as ransomware. This malicious program was discovered by GrujaRS. Ransomware-type programs encrypt files with strong encryption algorithms. To regain access to their files, victims are encouraged to buy a decryption tool and/or key from the cyber criminals who designed the ransomware. Kokoklock renames all files by adding an email address and a random extension to the filenames. For example, "sample.jpg" might be renamed to a filename such as "sample.jpg.mailto[].1a9296". The filename of the text file containing the ransom message has the same format as the extension added to all encrypted files. In this case, the text file would be named "1A9296-Readme.txt".

According to the ransom message delivered by these cyber criminals, Kokoklock encrypts all files. To receive instructions about how to decrypt them and/or pay the ransom, victims must send an email to Kokoklock developers using or The email must include a personal ID/ code, which is appointed to each victim individually. This code can be found at the bottom of the ransom message. Additionally, victims are permitted to attach one file that cyber criminals will decrypt free of charge. Typically, only the cyber criminals who designed the ransomware can decode files encrypted with their ransomware. Unfortunately, this is the case with Kokoklock ransomware. These programs lock files using strong encryptions that are usually impossible to 'crack. Never trust cyber criminals, since there is a high probability that they will not send decryption tools or keys even if they are paid. People who trust them are often scammed. Generally, 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 many other programs of this type such as .cmd, Peta, and Shariz. These programs prevent victims from accessing their data so that cyber criminals can force them to pay ransoms (purchase decryption software and/or keys). Two main variables are cost of decryption (ransom size) and cryptographic algorithm (symmetric or asymmetric) used to encrypt data. Typically, decryption without a help of cyber criminals is impossible, unless ransomware is not complete, has bugs/flaws, and so on. To avoid data and possible monetary loss in future, we recommend have data backed up and store it on a remote server such as Cloud or an unplugged storage device.

How did ransomware infect my computer?

There are various ways that ransomware and other malware is spread. Typically, cyber criminals use spam campaigns, software 'cracking' tools, Trojans, unofficial software updaters and untrustworthy software download channels. Using spam campaigns, they send emails that include attachments (or web links that lead to infected files). These files are usually PDF or Microsoft Office documents, JavaScript or executable files, archives such as RAR, ZIP, and so on. Typically, they disguise their emails and attachments as important, official, and so on, and hope that recipients open them. When opened, these files install high-risk malware. Software 'cracking' tools are usually expected to activate paid software or operating systems free of charge, however, they often install malicious programs. Malware is also spread through Trojans. If installed, these programs, cause chain infections by downloading and installing 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 such tools, often end up infecting their systems (they download malicious files disguised as harmless that actually install malware). Fake software updaters infect computers when they download and install malicious programs rather than updates, or they exploit bugs/flaws of outdated software 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 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, 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 malware infections our security researchers recommend scanning your computer with Spyhunter.
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How to protect yourself from ransomware infections

Do not open attachments that are included in emails received from unknown/untrustworthy addresses. Generally these are presented as official, however, they are not relevant to the recipients. To safely update installed software, use implemented functions or tools provided by official developers. Files or programs should not be downloaded from untrustworthy/unofficial websites, third party downloaders, or other channels as sources. The safest way to download is using official websites and direct download links. Software 'cracking' often infect systems with malware and are illegal. Do not activate any programs with them. Scan the operating system for viruses regularly using 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 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 malware removal: 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 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 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 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 as well as 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 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 malware 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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