TI Map Domain entity to Cloud App Events

Original query, unchanged.

let dt_lookBack = 1h;
let ioc_lookBack = 14d; 
let list_tlds =
  ThreatIntelIndicators
    | where TimeGenerated >= ago(ioc_lookBack)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
    | where IsActive and (ValidUntil > now() or isempty(ValidUntil))
    //extract key part of kv pair
    | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
    | where IndicatorType == "domain-name"
    | extend DomainName = tolower(IndicatorType)
    | extend parts = split(DomainName, '.')
    | extend tld = parts[(array_length(parts) - 1)]
    | extend IndicatorId = tostring(split(Id, "--")[2])
    | summarize count() by tostring(tld)
    | summarize make_set(tld);
let Domain_Indicators =
  ThreatIntelIndicators
    | where TimeGenerated >= ago(ioc_lookBack)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
    | where IsActive and (ValidUntil > now() or isempty(ValidUntil))
    | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
    | where IndicatorType == "domain-name"
    | extend DomainName = tolower(ObservableValue)
    | extend IndicatorId = tostring(split(Id, "--")[2])
    | project-reorder *, IndicatorType, DomainName, Type;
  Domain_Indicators
    | join kind=innerunique (
  CloudAppEvents
    | extend IngestionTime = ingestion_time()
    | where IngestionTime > ago(dt_lookBack)
    | extend PAUrl = columnifexists("RequestURL", "None")
    | extend Domain = tolower(trim('"', tostring(parseurl(PAUrl).Host)))
    | extend parts = split(Domain, '.')
    | extend tld = parts[(array_length(parts) - 1)]
    | extend CloudAppEvents_TimeGenerated = TimeGenerated) on $left.DomainName == $right.Domain
    | where CloudAppEvents_TimeGenerated < ValidUntil
    | summarize CloudAppEvents_TimeGenerated = argmax(CloudAppEvents_TimeGenerated, *) by IndicatorId
    | extend 
          Description = tostring(parse_json(max_CloudAppEvents_TimeGenerated_Data).description),
          ActivityGroupNames = column_ifexists("max_CloudAppEvents_TimeGenerated_ActivityGroupNames", ""),
          ThreatType = column_ifexists("max_CloudAppEvents_TimeGenerated_ThreatType", ""),
          ExpirationDateTime = column_ifexists("max_CloudAppEvents_TimeGenerated_ExpirationDateTime", ""),
          ConfidenceScore = column_ifexists("max_CloudAppEvents_TimeGenerated_ConfidenceScore", ""),
          DomainName = column_ifexists("max_CloudAppEvents_TimeGenerated_DomainName", ""),
          ProviderName = column_ifexists("max_CloudAppEvents_TimeGenerated_IndicatorProvider", ""),
          AlertSeverity = column_ifexists("max_CloudAppEvents_TimeGenerated_ThreatSeverity", ""),
          IPAddress = column_ifexists("max_CloudAppEvents_TimeGenerated_IPAddress", "")
    | project CloudAppEvents_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DomainName, ProviderName, AlertSeverity, IPAddress