Possible MFA Bypass Via Legacy Client Authentication (via signinlogs)
This rule detects successful authentication from potential clients using legacy authentication via user agent strings. This could be a sign of MFA bypass using a password spray attack.
SigmahighCloudv1
Full detection rule
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Sign in to unlockKnown false positives
- Unknown
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.