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

id: a7d2b1e4-dd9c-40fd-9651-1a136eb8f0df
name: TI map Domain entity to Cloud App Events
description: |
    'Identifies compromises and attacks and detect malicious activities in one's domain entity from TI.'
severity: Medium
requiredDataConnectors:
  - connectorId: MicrosoftThreatProtection
    dataTypes:
      - CloudAppEvents
  - 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 list_tlds =
    ThreatIntelIndicators
      | where TimeGenerated >= ago(ioc_lookBack)
      | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
      | where IsActive == true and ValidUntil > now()
      //extract key part of kv pair
      | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
      | where isnotempty(IndicatorType) and 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
      | where IsActive == true and ValidUntil > now()
      | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
      | where isnotempty(IndicatorType) and IndicatorType == "domain-name"
      | extend TI_DomainEntity = tolower(ObservableValue)
      | extend DomainName = TI_DomainEntity
      | extend IndicatorId = tostring(split(Id, "--")[2])
      | where isnotempty(TI_DomainEntity)
      | project-reorder *, IndicatorType, DomainName, Type, TI_DomainEntity;
    Domain_Indicators
      | join kind=innerunique (
    CloudAppEvents
      | extend IngestionTime = ingestion_time()
      | where IngestionTime > ago(dt_lookBack)
      | extend PAUrl = columnifexists("RequestURL", "None")
      | extend Domain = trim('"', tostring(parseurl(PAUrl).Host))
      | extend Domain = tolower(Domain)
      | extend parts = split(Domain, '.')
      | extend tld = parts[(array_length(parts) - 1)]
      | extend CloudAppEvents_TimeGenerated = TimeGenerated) on $left.TI_DomainEntity == $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
entityMappings:
  - entityType: DNS
    fieldMappings:
      - identifier: DomainName
        columnName: DomainName
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPAddress
version: 1.0.4
kind: Scheduled