huntrule

Detect DNS Queries to OAST Callback and Interaction Service Domains

Detects DNS lookups to common OAST/callback domains that may indicate SSRF-style or blind vulnerability validation.

FreeReviewedSigma · High · v2
Category
dns
Author
Florian Roth (Nextron Systems), Matt Kelly (list of domains) (SigmaHQ), DRL 1.1
Published
2022-06-07
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Recon → Initial Access

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule identifies DNS queries whose queried name ends with known out-of-band application security testing (OAST) and callback service domains. Attackers and scanners use these domains to confirm blind exploitation paths where a payload triggers an external DNS lookup to a controlled unique subdomain. The detection relies on DNS telemetry, matching query suffixes and excluding queries related to a specific polling pattern to reduce noise. Investigate the requesting host and the full DNS query to determine whether activity aligns with probing/exploitation or internal security scanning.

Reporting behind it

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Detect DNS Queries to OAST Callback and Interaction Service Domains
Pivot detection · T1190 · 9 related

Changelog

v2
  1. v2
    Candidate ingested via manual entry.2026-07-31
  2. v1
    No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.