Exposing the Enemy Within Webinar

DNS data exposes compromised hosts and insider threats by showing the resolution requests and query patterns originating from devices on the network. Abnormal DNS queries—such as requests to newly registered or known malicious domains, high-volume lookups, unusual subdomain structures, or queries at odd times—indicate potential compromise or covert communication channels. Because nearly all network activity relies on DNS, collecting and analyzing DNS telemetry provides visibility into command-and-control callbacks, data exfiltration via DNS tunneling, and unauthorized lateral movement, enabling security teams to identify the ‘enemy within’ based on observable DNS behaviors.

Integrating DNS telemetry into security workflows improves detection and response capabilities by supplying a continuous, network-wide signal that supplements logs from endpoints and firewalls. DNS data helps prioritize alerts by correlating suspicious domain resolutions with host context, accelerates incident investigations through historical query records, and reduces dwell time by revealing covert channels and command-and-control activity early. Operationally, this leads to more effective threat hunting, better-informed containment decisions, and streamlined forensic workflows because teams can quickly trace malicious communications back to specific hosts and user sessions.

The article identifies several malicious activities detectable through DNS analysis, including command-and-control communications, DNS tunneling used for data exfiltration, and indicators of lateral movement within the network. It notes that patterns such as frequent lookups to suspicious domains, queries to rapidly changing or newly registered domains, and anomalous subdomain structures can signal active compromise. By monitoring these DNS indicators, security teams can uncover both external threats and insider-enabled attacks that might otherwise evade detection by traditional security controls.