Detect threat information in web requests (ASIM Web Session)

Requête originale, sans modification.

let lookback= 5m;
_Im_WebSession(starttime=ago(lookback))
| project
    EventSeverity,
    ThreatName,
    ThreatCategory,
    ThreatRiskLevel,
    ThreatOriginalConfidence,
    ThreatField,
    TimeGenerated,
    SrcIpAddr,
    SrcUsername,
    SrcHostname,
    Url,
    DstIpAddr
| where ThreatRiskLevel >= 90
    or toint(ThreatOriginalConfidence) >= 90
    or EventSeverity =~ "High"
| summarize
    EventCount = count(),
    EventStartTime=min(TimeGenerated),
    EvenEndTime=max(TimeGenerated)
    by
    SrcIpAddr,
    SrcUsername,
    SrcHostname,
    Url,
    DstIpAddr,
    ThreatName,
    ThreatCategory,
    ThreatRiskLevel,
    ThreatOriginalConfidence,
    ThreatField
| extend
    Name = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),
    UPNSuffix = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 1)[0]), "")