Implementing Egress Controls to Prevent Data Exfiltration
π This post outlines an architecture and controls for preventing data exfiltration from AWS environments by combining centralized network inspection, DNS filtering, and data perimeter policies. It explains a hub-and-spoke pattern using Transit Gateway, AWS Network Firewall, and Route 53 Resolver DNS Firewall to inspect and block unauthorized outbound traffic, including scenarios involving compromised workloads and agentic AI. The article details layered preventive, detective, and corrective measures using AWS services such as GuardDuty, Security Hub, IAM Access Analyzer, EventBridge, and Firewall Manager to automate detection and response.