Suspicious Entra Sign-In Interrupt With High Aggregated Risk via AiTM DNS Hijacking (via azure)

ATT&CK techniques

Cred Access → C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1557Adversary-in-the-Middle
Discovery
Lateral Movement
Collection
- T1557Adversary-in-the-Middle
C2
- T1071.004DNS
Exfiltration
Impact

What it detects

This rule surfaces Microsoft Entra sign-ins carrying a high aggregated risk score alongside interrupt or success result codes, the pattern seen when SOHO router DNS hijacking redirects victims through an adversary-in-the-middle proxy that replays authentication. Adversaries use the hijacked DNS to intercept credentials and tokens, so high-risk sign-ins clustered with these result codes warrant investigation for token theft and mailbox access.

Reporting behind it

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Suspicious Entra Sign-In Interrupt With High Aggregated Risk via AiTM DNS Hijacking (via azure)

Pivot detection · T1071.004 · 9 related

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

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