Sign-in Brute Force against M365 Accounts
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About the rule
Rule Type
Standard
Rule Description
Detects potential brute-force attempts against Microsoft 365 user accounts by detecting a high number of failed login attempts.
Severity
Critical
Rule Requirement
Criteria
Action1:
actionname = "Failed Logon events"
| timewindow 30m
| groupby CALLER having COUNT >= 10
select Action1.timewindow.CALLER,Action1.timewindow.ERRORCODE,Action1.timewindow.APPLICATIONNAME,Action1.timewindow.IPADDRESS,Action1.timewindow.COUNTRYCODE,Action1.timewindow.RISK_LEVEL,Action1.timewindow.RESULT
Detection
Execution Mode
realtime
Log Sources
Microsoft 365
