.KK File Extension

SyncCrypt Ransomware Encrypted File

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What is a KK file?

A file with the .kk extension has been renamed and encrypted by SyncCrypt ransomware. It contains a document, image, archive, database, or other type of file the ransomware is holding hostage. The .kk extension is added to the file's normal extension, producing a compound extension like .docx.kk.

More Information

In 2017, some users began reporting that their computers had been infected by SyncCrypt ransomware. SyncCrypt encrypts many of a user's files and renames them to use the .kk extension. It then opens a ransom note named readme.html in the user's default web browser. It also creates a folder named README on the user's desktop, which contains the ransom note and a .TXT file named AMMOUNT.txt, which specifies the ransom amount.

How did my computer get infected by SyncCrypt ransomware?

SyncCrypt ransomware is spread using emails that contain .WSF (Windows Script File) attachments. Typically, these WSF files are disguised as court orders, using filenames such as CourtOrder_356798287.wsf. If a user opens one of these WSF files, it will execute a process that downloads a .JPEG image from the Internet. This image contains embedded files that the ransomware uses to install itself.

How to open a KK file

Because KK files are encrypted, you cannot open them. At this time, there is no way to decrypt KK files. The best way to restore files encrypted by KK ransomware is to retrieve them from a recent backup or perform a System Restore.


FileInfo.com recommends you never pay a ransom to decrypt files encrypted by ransomware. Paying a ransom encourages ransomware distributors to continue their efforts, and there is no guarantee that paying a ransom will give you access to your files. Instead, you should restore your data from a recent backup created before the ransomware infected your computer.

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Programs that open KK files

System Restore

Verified by FileInfo.com

The FileInfo.com team has independently researched the SyncCrypt Ransomware Encrypted file format and Windows apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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