NOBU is a STOP/DJVU family of ransomware-type infections. This type locks your private files (videos, images, documentations). Then your files' name will end by this new extension “.nobu” . So, you can’t obtain access to them at all, this ransomware can create many extensions like" lisp , weui , sglh , ..... "  and  mango school  channel is interested to provide you with all information about this cyber attack.