Solutions/Threat Intelligence (NEW)/Analytic Rules/URLEntity_UrlClickEvents_Updated.yaml

id: ad4fa1f2-2189-459c-9458-f77d2039d2f5
name: TI Map URL Entity to UrlClickEvents
description: |
  'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in UrlClickEvents.'
severity: Medium
requiredDataConnectors:
  - connectorId: MicrosoftThreatProtection
    dataTypes:
      - UrlClickEvents
  - connectorId: ThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: ThreatIntelligenceTaxii
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: MicrosoftDefenderThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
queryFrequency: 1h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CommandAndControl
relevantTechniques:
  - T1071
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let UrlClickEvents_ = materialize(UrlClickEvents
      | where TimeGenerated >= ago(dt_lookBack)
      | extend UrlClickEvents_TimeGenerated = TimeGenerated);
  let ChainReportID = UrlClickEvents_
      | mv-expand todynamic(UrlChain)
      | extend UrlChain = tolower(UrlChain)
      | project ReportId, Url, UrlChain;
  // Url is not always in UrlChain, so we need to check both
  let ClickedUrls = 
    (union isfuzzy=false (ChainReportID), (ChainReportID | project Url = UrlChain))
    | distinct Url
    | summarize make_list(Url);
  let TI = materialize(ThreatIntelIndicators
  //extract key part of kv pair
  | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
  | where IndicatorType == "url"
  | extend Url = ObservableValue
  | where isnotempty(Url)
    | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
    | where TimeGenerated >= ago(ioc_lookBack)
    | where isnotempty(Url) and tolower(Url) in (ClickedUrls)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
    | where IsActive == true and ValidUntil > now()
    | project-rename TI_Url = Url, TI_Type = Type
    );
  (union isfuzzy=false (TI | join kind=innerunique (ChainReportID) on $left.TI_Url == $right.UrlChain),
    (TI | join kind=innerunique (ChainReportID) on $left.TI_Url == $right.Url))
  | project-away UrlChain
  | join kind=innerunique (UrlClickEvents_) on ReportId
  | where UrlClickEvents_TimeGenerated < ValidUntil
  | summarize UrlClickEvents_TimeGenerated = arg_max(UrlClickEvents_TimeGenerated, *) by Id
  | extend Description = tostring(parse_json(Data).description)
  | extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
  | project UrlClickEvents_TimeGenerated, AccountUpn, Description, ActivityGroupNames, Id, Type, ValidUntil, Confidence, Url, NetworkMessageId
  | extend timestamp = UrlClickEvents_TimeGenerated
  | extend timestamp = UrlClickEvents_TimeGenerated, Name = tostring(split(AccountUpn, '@', 0)), UPNSuffix = tostring(split(AccountUpn, '@', 1))
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: AccountUpn
      - identifier: Name
        columnName: Name
      - identifier: UPNSuffix
        columnName: UPNSuffix
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: Url
version: 1.0.3
kind: Scheduled