While ransomware is not new, major attacks like WannaCry, Petya/NotPetya and, more recently, TrickBot have shown that existing prevention methods have become ineffective at preventing advanced ransomware attacks. Attackers have evolved their approach and use of malware to become more sophisticated, automated, targeted and highly evasive.

https://researchcenter.paloaltonetworks.com/2019/01/preventing-malware-ransomware-traps/