.CK File Virus – Remove and Decrypt Files for Free - How to, Technology and PC Security Forum | SensorsTechForum.com

.CK File Virus – Remove and Decrypt Files for Free

This article has been created to help you remove the .CK CryptoMix ransomware variant and decrypt files that have been encrypted by it on your PC.

Yet another of the many CryptoMix ransomware versions has appeared in the wild following the .EXTE CryptoMix variant, using the .CK file extension and a ransom note with absolutely the same name – “_HELP_INSTRUCTION.TXT”. The ransomware aims to use multiple different types of important files on the computers infected by it. The files are then encoded by the encryption algorithm used by CryptoMix and become no longer openable until the victim makes a payment. If your computer has been infected by the .CK file virus, we advise you to read this article thoroughly.

Threat Summary

Name.CK Virus
TypeRansomware, Cryptovirus
Short DescriptionEncrypts the files on the computers infected by it in order to demand ransom from victims.
SymptomsAdds the .CKfile extension and changes the names of the encrypted files.
Distribution MethodSpam Emails, Email Attachments, Executable files
Detection Tool See If Your System Has Been Affected by .CK Virus


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss .CK Virus.

.CK File Ransomware – What Does It Do

The .CK file ransomware is an iteration of the CryptoMix ransomware variants. This means that the virus performs different malicious activities on a system it has infected, starting wit dropping it’s malicious payload files after an infection takes place. The files are dropped with the aid of a dropper or a loader. Such software may come on your computer via pretending to be a legitimate file, like:

  • Fake setup of any type of software uploaded online.
  • A document which may be an invoice, receipt or other seemingly important file and may contain malicious macros.
  • A fake game activator, license activation software or other type of setup.
  • A fake web link posted as a button on suspicious sites or linked as a commend on social media or other websites.

After this has occurred the, .CK ransomware may quickly connect to the C2 servers of the cyber-criminals and download the payload. It may consist of multiple files that have different, often random names and are located in the usual Windows folders:

  • %AppData%
  • %Roaming%
  • %Local%
  • %LocalLow%
  • %Temp%

After being dropped and activated the files belonging to the .CK CryptoMix ransomware may perform the following activities:

  • Obtain administrative permissions by Inserting various different functions in Windows processes.
  • Manage to interfere with the Windows Registry Editor and modify the Run and RunOnce registry sub-keys.
  • Insert administrative commands in Windows Command Prompt that may delete the shadow copies on your computer.

The primary activity of the virus is to perform the encryption of the important files on the computers infected by it. The .CK file virus attacks the following files to render them enciphered:

.sql, .mp4, .7z, .rar, .m4a, .wma, .avi, .wmv, .csv, .d3dbsp, .zip, .sie, .sum, .ibank, .t13, .t12, .qdf, .gdb, .tax, .pkpass, .bc6, .bc7, .bkp, .qic, .bkf, .sidn, .sidd, .mddata, .itl, .itdb, .icxs, .hvpl, .hplg, .hkdb, .mdbackup, .syncdb, .gho, .cas, .svg, .map, .wmo, .itm, .sb, .fos, .mov, .vdf, .ztmp, .sis, .sid, .ncf, .menu, .layout, .dmp, .blob, .esm, .vcf, .vtf, .dazip, .fpk, .mlx, .kf, .iwd, .vpk, .tor, .psk, .rim, .w3x, .fsh, .ntl, .arch00, .lvl, .snx, .cfr, .ff, .vpp_pc, .lrf, .m2, .mcmeta, .vfs0, .mpqge, .kdb, .db0, .dba, .rofl, .hkx, .bar, .upk, .das, .iwi, .litemod, .asset, .forge, .ltx, .bsa, .apk, .re4, .sav, .lbf, .slm, .bik, .epk, .rgss3a, .pak, .big, wallet, .wotreplay, .xxx, .desc, .py, .m3u, .flv, .js, .css, .rb, .png, .jpeg, .txt, .p7c, .p7b, .p12, .pfx, .pem, .crt, .cer, .der, .x3f, .srw, .pef, .ptx, .r3d, .rw2, .rwl, .raw, .raf, .orf, .nrw, .mrwref, .mef, .erf, .kdc, .dcr, .cr2, .crw, .bay, .sr2, .srf, .arw, .3fr, .dng, .jpe, .jpg, .cdr, .indd, .ai, .eps, .pdf, .pdd, .psd, .dbf, .mdf, .wb2, .rtf, .wpd, .dxg, .xf, .dwg, .pst, .accdb, .mdb, .pptm, .pptx, .ppt, .xlk, .xlsb, .xlsm, .xlsx, .xls, .wps, .docm, .docx, .doc, .odb, .odc, .odm, .odp, .ods, .odt.

After having done this, the files no longer appear the same. They are appended the .CK file extension and their names are completely changed to random ones, making them appear like the following:

Fortunately, this CryptoMix ransomware variant is likely decryptable, but first it is important to remove it completely. For more information how to remove the .CK file virus and then decrypt your files, we advise you to follow the instructions below. Experts strongly advise firstly removing this virus and then performing the decryption on an already safe PC.

Remove .CK CryptoMix from Your PC

Before actually beginning the removal process, we would advise to backup all your files, even though they are encrypted. Then, we recommend you to follow the instructions below. You can try to find and remove the malicious files of the .CK ransomware manually, but for maximum effectiveness, a ransomware-specific anti-malware programs should be used to scan for and remove all traces of the .CK file virus automatically.

Manually delete .CK Virus from your computer

Note! Substantial notification about the .CK Virus threat: Manual removal of .CK Virus requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.

1. Boot Your PC In Safe Mode to isolate and remove .CK Virus files and objects
2.Find malicious files created by .CK Virus on your PC

Automatically remove .CK Virus by downloading an advanced anti-malware program

1. Remove .CK Virus with SpyHunter Anti-Malware Tool and back up your data

.CK Ransomware – Decryption Process

Before any decryption process by this virus begins, recommendations are to use an advanced anti-malware tool to remove the infection and then to back-up the encrypted files by creating several copies of them on different removable drives or in the cloud.

Then, we advise you to follow these steps:

Step #1: Download “CryptoMix Fix” tool from Avast’s website. Link to the download page, you can locate below:


Make sure to save the file somewhere where you can easily find it:

Step #2: Run the program and click on the “Next” button.

Step #3: Choose the drive which you want to be scanned for encrypted files and click on “Next” once more. You can also add a folder that has important files, by clicking on the “Add Folder” button on the bottom-right:

Step #4: Find an original file and it’s encrypted analogue. If you struggle finding an original file, please check the default Windows folders of a non-infected PC with the same version of Windows as yours:

→ For newer Windows (8, 8.1, 10):
For Windows 7 and earlier:

Step #5: Upload the files in the blank fields of the next step of the Avast CryptoMix Fix decryptor:

Step #6: Paste the password from your version of CryptoMix in the next field in case you know it:

And now all that is left is to run the decryptor and it will begin to do it’s magic.

Vencislav Krustev

A network administrator and malware researcher at SensorsTechForum with passion for discovery of new shifts and innovations in cyber security. Strong believer in basic education of every user towards online safety.

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