Preview - TI map Domain entity to Cloud App Events

let dt_lookBack = 1h;
let ioc_lookBack = 14d; 
let list_tlds =
  ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now()
    | where isnotempty(DomainName)
    | extend DomainName = tolower(DomainName)
    | extend parts = split(DomainName, '.')
    | extend tld = parts[(array_length(parts) - 1)]
    | summarize count() by tostring(tld)
    | summarize make_set(tld);
let Domain_Indicators =
  ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now()
    | extend TI_DomainEntity = DomainName
    | where isnotempty(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 < ExpirationDateTime
    | summarize CloudAppEvents_TimeGenerated = argmax(CloudAppEvents_TimeGenerated, *) by IndicatorId
    | extend Description = max_CloudAppEvents_TimeGenerated_Description, ActivityGroupNames = max_CloudAppEvents_TimeGenerated_ActivityGroupNames, ThreatType = max_CloudAppEvents_TimeGenerated_ThreatType, ExpirationDateTime = max_CloudAppEvents_TimeGenerated_ExpirationDateTime, ConfidenceScore = max_CloudAppEvents_TimeGenerated_ConfidenceScore, DomainName = max_CloudAppEvents_TimeGenerated_DomainName, ProviderName = max_CloudAppEvents_TimeGenerated_IndicatorProvider, AlertSeverity = max_CloudAppEvents_TimeGenerated_ThreatSeverity, IPAddress = max_CloudAppEvents_TimeGenerated_IPAddress
    | project CloudAppEvents_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DomainName, ProviderName, AlertSeverity, IPAddress

tactics:
- CommandAndControl
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d; 
  let list_tlds =
    ThreatIntelligenceIndicator
      | where TimeGenerated >= ago(ioc_lookBack)
      | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
      | where Active == true and ExpirationDateTime > now()
      | where isnotempty(DomainName)
      | extend DomainName = tolower(DomainName)
      | extend parts = split(DomainName, '.')
      | extend tld = parts[(array_length(parts) - 1)]
      | summarize count() by tostring(tld)
      | summarize make_set(tld);
  let Domain_Indicators =
    ThreatIntelligenceIndicator
      | where TimeGenerated >= ago(ioc_lookBack)
      | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
      | where Active == true and ExpirationDateTime > now()
      | extend TI_DomainEntity = DomainName
      | where isnotempty(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 < ExpirationDateTime
      | summarize CloudAppEvents_TimeGenerated = argmax(CloudAppEvents_TimeGenerated, *) by IndicatorId
      | extend Description = max_CloudAppEvents_TimeGenerated_Description, ActivityGroupNames = max_CloudAppEvents_TimeGenerated_ActivityGroupNames, ThreatType = max_CloudAppEvents_TimeGenerated_ThreatType, ExpirationDateTime = max_CloudAppEvents_TimeGenerated_ExpirationDateTime, ConfidenceScore = max_CloudAppEvents_TimeGenerated_ConfidenceScore, DomainName = max_CloudAppEvents_TimeGenerated_DomainName, ProviderName = max_CloudAppEvents_TimeGenerated_IndicatorProvider, AlertSeverity = max_CloudAppEvents_TimeGenerated_ThreatSeverity, IPAddress = max_CloudAppEvents_TimeGenerated_IPAddress
      | project CloudAppEvents_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DomainName, ProviderName, AlertSeverity, IPAddress  
requiredDataConnectors:
- dataTypes:
  - CloudAppEvents
  connectorId: MicrosoftThreatProtection
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
name: Preview - TI map Domain entity to Cloud App Events
queryPeriod: 14d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_CloudAppEvents.yaml
triggerThreshold: 0
description: |
    'Identifies compromises and attacks and detect malicious activities in one's domain entity from TI.'
version: 1.0.3
kind: Scheduled
queryFrequency: 1h
severity: Medium
entityMappings:
- entityType: DNS
  fieldMappings:
  - identifier: DomainName
    columnName: DomainName
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPAddress
triggerOperator: gt
id: b97e118c-b7fa-42a6-84de-2e13443fbb8f
relevantTechniques:
- T1071