This document summarizes a webinar presented by Hortonworks and Sqrrl on using big data analytics for cybersecurity. It discusses how the growth of data sources and targeted attacks require new security approaches. A modern data architecture with Hadoop can provide a common platform to analyze all security-related data and gain new insights. Sqrrl's linked data model and analytics run on Hortonworks to help investigate security incidents like a network breach, mapping different data sources and identifying abnormal activity patterns.