TI Map URL Entity to AuditLogs

Original query, unchanged.

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let AuditEvents = materialize(AuditLogs
  | where TimeGenerated >= ago(dt_lookBack)
  // Extract the URL that is contained within the JSON data
  | extend Url = tolower(extract("(http[s]?://[^\\s\\\"\\\\]+)", 1, tostring(TargetResources)))
  | extend userPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend TargetResourceDisplayName = tostring(TargetResources[0].displayName));
let AuditUrls = AuditEvents | distinct Url = tolower(Url) | summarize make_list(Url);
ThreatIntelIndicators
//extract key part of kv pair
     | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
     | where IndicatorType == "url"
     | extend Url = tolower(ObservableValue)
     | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
| where TimeGenerated >= ago(ioc_lookBack)
| where tolower(Url) in (AuditUrls)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
| where IsActive and (ValidUntil > now() or isempty(ValidUntil))
| extend Description = tostring(parse_json(Data).description)
| where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (AuditEvents) on Url
| where TimeGenerated < ValidUntil
| summarize TimeGenerated = arg_max(TimeGenerated, *) by Id, Url
| extend Description = tostring(parse_json(Data).description)
| extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
| project TimeGenerated, Description, ActivityGroupNames, Id, Type, ValidUntil, Confidence,
OperationName, Identity, userPrincipalName, TargetResourceDisplayName, Url
| extend AccountName = tostring(split(userPrincipalName, "@")[0]), AccountUPNSuffix = tostring(split(userPrincipalName, "@")[1])
| extend HostName = tostring(split(TargetResourceDisplayName, ".")[0]), DomainIndex = toint(indexof(TargetResourceDisplayName, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(TargetResourceDisplayName, DomainIndex + 1), TargetResourceDisplayName)