The document summarizes 7 major cyber attacks that shook the world: 1. In 2006, a data breach at the Veteran Administration exposed personal information of 26.5 million US military personnel. 2. The 2017 WannaCry ransomware attack spread to over 150 countries through unpatched Microsoft Windows systems, encrypting user data and causing $4 billion in damages. 3. Ransomware attacks are becoming more advanced and sophisticated over time. 4. A 2011 data breach at marketing firm Epsilon resulted in theft of email accounts and personal details from thousands of customers, causing $225 million in damages.