Multiple Denied MFA Requests
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About the rule
Rule Type
Standard
Rule Description
Detects an unusually high number of denied Multi-Factor Authentication (MFA) requests for a single user
Severity
Critical
Rule Requirement
Criteria
Action1:
actionname = "DETECTION_ACTION_M365_MFA_EXPLICITLY_DENIED_BY_AN_USER"
| timewindow 10m
| groupby CALLER having COUNT >= 9
select Action1.timewindow.CALLER,Action1.timewindow.APPLICATIONNAME,Action1.timewindow.IPADDRESS,Action1.timewindow.COUNTRYCODE,Action1.timewindow.ERRORCODE,Action1.timewindow.RESULT
Detection
Execution Mode
realtime
Log Sources
Microsoft 365
