Yujang

Hello, i would like to ask does anyone know this version of STOP/Djvu YTBN, what year / month they first come and is it possible to Decrypt it? i tried almost all the methods i found from 8 hour browsing and still can't Decrypt my file. If it's not possible at the current STOP/Djvu Decrypt build, can anyone know when does the approximate new Decryptor come? and what do i do with my infected files? should i just delete them since there's nothing that can Decrypt it right now? Thank you.