Security Event log cleared

Requête originale, sans modification.

(union isfuzzy=true
(
SecurityEvent
| where EventID == 1102 and EventSourceName =~ "Microsoft-Windows-Eventlog"
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), EventCount = count() by Computer, Account, EventID, Activity
),
(
WindowsEvent
| where EventID == 1102 and Provider =~ "Microsoft-Windows-Eventlog"
| extend Account =  strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend Activity= "1102 - The audit log was cleared."
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), EventCount = count() by Computer, Account, EventID, Activity
)
)
| extend Name=tostring(split(Account, "@")[0]), UPNSuffix=tostring(split(Account, "@")[1])
| extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')