Hello Manpreet.
Thank you for contacting AVG Support Community.
We're sorry to hear that you're facing this trouble.
We will certainly check and help you.
Please confirm us whether you have added infected files under Ransomware protection shield.
Also please provide us the screenshot which shows .kook extension, we will check and help you further.
In case you need help with creating the screenshot, please refer to the below article.
https://support.avg.com/SupportArticleView?l=en&urlname=Create-screenshot
Thank you and keep us updated.
hi even ihad installed avg internet security but still got ransomware name .kook extension which corrupted my files with encryption .and need decryption tool to remove virus and restore file
Hello Manpreet.
Thank you for contacting AVG Support Community.
We're sorry to hear that you're facing this trouble.
We will certainly check and help you.
Please confirm us whether you have added infected files under Ransomware protection shield.
Also please provide us the screenshot which shows .kook extension, we will check and help you further.
In case you need help with creating the screenshot, please refer to the below article.
https://support.avg.com/SupportArticleView?l=en&urlname=Create-screenshot
Thank you and keep us updated.