Petya and WannaCry are not unique: 91 percent of all cyberattacks start with phish emails. Analysis of cyberattacks suggest that 91 percent start with email phish. The majority of enterprises remain vulnerable to inbound phishing emails that often are the originators of ransomware attacks. The most common mistake among companies responding to cyberattacks is that they dont lock down their domains to ensure that attackers can use the companys domain name in email messages. Even companies that know about email authentication can’t completely implement it.”]
Source: https://www.csoonline.com/article/3211413/how-cios-can-avoid-the-next-ransomware-attack.html