Kyrie is a security analyst that belongs to the LinkedIn group Secure your Business. He gets to know some of the others in the group and shares information about his corporate network. Within 2 weeks, his organization is hit with ransomware. Which attack did the hacker use?

Domain 5: Identity and Access Management Practice Questions
Questions from the following topics are included in this domain: 
Controlling physical and logical access to assets 
Managing authentication of people and devices
Implementing and managing federation, and other authorization mechanisms
Managing the provisioning and deprovisioning life cycle
Implementing and managing authentication systems