DNS spoofing alerts: are your detection controls actually catching them?

TL;DR: DNS spoofing remains a practical redirection technique because forged responses, low TTL values, and conflicting resolutions can still slip past weak monitoring, according to Wazuh's analysis. For identity and access teams, the risk is not just traffic diversion but credential interception and trust failure at the point of authentication.

NHIMG editorial — based on content published by Wazuh: detecting DNS spoofing attacks with Zeek and Wazuh

By the numbers:

• When AWS credentials are exposed publicly, attackers attempt access within an average of 17 minutes.
• Only 38% have automated certificate lifecycle management in place.

Questions worth separating out

Q: How should security teams prevent DNS spoofing in production environments?

A: Security teams should sign public zones with DNSSEC, validate delegation paths, and monitor resolver behaviour so forged answers cannot be trusted or cached silently.

Q: Why does DNS spoofing create identity risk even when login controls are strong?

A: DNS spoofing can send users to a convincing fake site before any MFA prompt, certificate check, or session control is reached.

Q: What do security teams get wrong about DNS spoofing detection?

A: They often watch only for obvious poisoning indicators and ignore endpoint-level overrides, inconsistent resolution, and resolver trust boundaries.

Practitioner guidance

• Baseline DNS resolution for critical domains Track normal resolver outputs, TTL ranges, and authoritative sources for business-critical hostnames so that mismatched or rapidly changing answers stand out immediately.
• Correlate DNS logs with endpoint integrity alerts Combine Zeek-derived DNS telemetry with file-integrity monitoring on /etc/hosts and similar local resolution files to catch both network and host-level spoofing paths.
• Alert on low TTL and untrusted authoritative responses Create rules that flag DNS responses with unusually short TTL values, especially when they come from resolvers outside the approved trust set or claim authoritative status unexpectedly.

What's in the full article

Wazuh's full blog post covers the operational detail this post intentionally leaves for the source:

• Custom Zeek decoder and rule examples for identifying forged DNS responses in Wazuh
• Step-by-step agent and dashboard configuration for monitoring DNS logs and /etc/hosts changes
• A lab-style attack simulation using Scapy and dig to validate the detection rules
• Rule logic for low TTL, untrusted authoritative answers, and local host-file tampering

👉 Read Wazuh's analysis of DNS spoofing detection with Zeek and Wazuh →

DNS spoofing alerts: are your detection controls actually catching them?

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