randsomeware .lockbit
@Kalam
Since bitdefender detects all variants of lockbit ransomware till date, it seems either you were not using bitdefender or your real time protection was not enabled.
That being said, currently there is no decryptors available to decrypt files encrypted by lockbit ransomware. You can copy the encrypted files to an external drive or usb and wait until decryptor for lockbit ransomware is available.
Maybe below link might help you to restores your files through shadow copies.
https://www.myantispyware.com/2020/04/27/how-to-remove-lockbit-ransomware-recover-encrypted-files/#decrypt
Regards
Flex
(Bitdefender beta tester 2019/ 2020)