Preview - TI map Domain entity to Cloud App Events

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Id	b97e118c-b7fa-42a6-84de-2e13443fbb8f
Rulename	Preview - 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
Tactics	CommandAndControl
Techniques	T1071
Required data connectors	MicrosoftDefenderThreatIntelligence MicrosoftThreatProtection
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_CloudAppEvents.yaml
Version	1.0.3
Arm template	b97e118c-b7fa-42a6-84de-2e13443fbb8f.json

KQL

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

YAML

queryFrequency: 1h
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - CloudAppEvents
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_CloudAppEvents.yaml
entityMappings:
- entityType: DNS
  fieldMappings:
  - identifier: DomainName
    columnName: DomainName
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPAddress
relevantTechniques:
- T1071
name: Preview - TI map Domain entity to Cloud App Events
description: |
    'Identifies compromises and attacks and detect malicious activities in one's domain entity from TI.'
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  
queryPeriod: 14d
triggerOperator: gt
severity: Medium
tactics:
- CommandAndControl
id: b97e118c-b7fa-42a6-84de-2e13443fbb8f
version: 1.0.3
kind: Scheduled
triggerThreshold: 0

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/b97e118c-b7fa-42a6-84de-2e13443fbb8f')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b97e118c-b7fa-42a6-84de-2e13443fbb8f')]",
      "properties": {
        "alertRuleTemplateName": "b97e118c-b7fa-42a6-84de-2e13443fbb8f",
        "customDetails": null,
        "description": "'Identifies compromises and attacks and detect malicious activities in one's domain entity from TI.'\n",
        "displayName": "Preview - TI map Domain entity to Cloud App Events",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "DNS",
            "fieldMappings": [
              {
                "columnName": "DomainName",
                "identifier": "DomainName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_CloudAppEvents.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d; \nlet list_tlds =\n  ThreatIntelligenceIndicator\n    | where TimeGenerated >= ago(ioc_lookBack)\n    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n    | where Active == true and ExpirationDateTime > now()\n    | where isnotempty(DomainName)\n    | extend DomainName = tolower(DomainName)\n    | extend parts = split(DomainName, '.')\n    | extend tld = parts[(array_length(parts) - 1)]\n    | summarize count() by tostring(tld)\n    | summarize make_set(tld);\nlet Domain_Indicators =\n  ThreatIntelligenceIndicator\n    | where TimeGenerated >= ago(ioc_lookBack)\n    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n    | where Active == true and ExpirationDateTime > now()\n    | extend TI_DomainEntity = DomainName\n    | where isnotempty(TI_DomainEntity);\n  Domain_Indicators\n    | join kind=innerunique (\n  CloudAppEvents\n    | extend IngestionTime = ingestion_time()\n    | where IngestionTime > ago(dt_lookBack)\n    | extend PAUrl = columnifexists(\"RequestURL\", \"None\")\n    | extend Domain = trim('\"', tostring(parseurl(PAUrl).Host))\n    | extend Domain = tolower(Domain)\n    | extend parts = split(Domain, '.')\n    | extend tld = parts[(array_length(parts) - 1)]\n    | extend CloudAppEvents_TimeGenerated = TimeGenerated) on $left.TI_DomainEntity == $right.Domain\n    | where CloudAppEvents_TimeGenerated < ExpirationDateTime\n    | summarize CloudAppEvents_TimeGenerated = argmax(CloudAppEvents_TimeGenerated, *) by IndicatorId\n    | 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\n    | project CloudAppEvents_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DomainName, ProviderName, AlertSeverity, IPAddress\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}