Suspicious M365 Sign-In from Programmatic Password Spraying User Agent

ATT&CK techniques

Cred Access

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1110.003Password Spraying
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects Microsoft 365 sign-in activity presenting user agents associated with programmatic HTTP libraries and password spraying frameworks such as Axios, python-requests, CredMaster, and TREVORspray. These clients drive automated credential attacks against cloud identities from non-interactive infrastructure. Programmatic sign-in agents against user accounts indicate credential stuffing or spraying rather than legitimate browser access.

Reporting behind it

Related detections6 linkedT1110.003 — drag to rearrange

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Suspicious M365 Sign-In from Programmatic Password Spraying User Agent

Pivot detection · T1110.003 · 6 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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