TI map URL entity to Cloud App Events

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelIndicators
//extract key part of kv pair
| extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
| where IndicatorType == "url"
| extend Url = ObservableValue
| extend IndicatorId = tostring(split(Id, "--")[2])
| where TimeGenerated >= ago(ioc_lookBack)
| where isnotempty(Url)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where IsActive == true and ValidUntil > now()
| join kind=innerunique (CloudAppEvents
| where TimeGenerated >= ago(dt_lookBack)
| extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)", 1, tostring(ActivityObjects))
| extend userPrincipalName = tostring(RawEventData.UserId)
| extend TargetResourceDisplayName = tostring(ActivityObjects[0].displayName)
| extend CloudApps_TimeGenerated = TimeGenerated) on Url
| where CloudApps_TimeGenerated < ValidUntil
| summarize CloudApps_TimeGenerated = argmax(CloudApps_TimeGenerated, *) by IndicatorId, Url
| extend 
  Description = column_ifexists("max_CloudApps_TimeGenerated_Description", ""),
  ActivityGroupNames = column_ifexists("max_CloudApps_TimeGenerated_ActivityGroupNames", ""),
  ThreatType = column_ifexists("max_CloudApps_TimeGenerated_ThreatType", ""),
  ExpirationDateTime = column_ifexists("max_CloudApps_TimeGenerated_ExpirationDateTime", ""),
  ConfidenceScore = column_ifexists("max_CloudApps_TimeGenerated_ConfidenceScore", ""),
  IPAddress = column_ifexists("max_CloudApps_TimeGenerated_IPAddress", ""),
  AccountObjectId = column_ifexists("max_CloudApps_TimeGenerated_AccountObjectId", ""),
  AccountDisplayName = column_ifexists("max_CloudApps_TimeGenerated_AccountDisplayName", ""),
  ObjectName = column_ifexists("max_CloudApps_TimeGenerated_ObjectName", ""),
  Application = column_ifexists("max_CloudApps_TimeGenerated_Application", ""),
  ApplicationID = column_ifexists("max_CloudApps_TimeGenerated_ApplicationId", ""),
  userPrincipalName = column_ifexists("max_CloudApps_TimeGenerated_userPrincipalName", "")
| project CloudApps_TimeGenerated, Description, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, IPAddress, userPrincipalName, AccountObjectId, AccountDisplayName, ObjectName, Application, ApplicationID

queryFrequency: 1h
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - CloudAppEvents
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/URLEntity_CloudAppEvents_Updated.yaml
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: ObjectGuid
    columnName: AccountObjectId
  - identifier: FullName
    columnName: userPrincipalName
  - identifier: DisplayName
    columnName: AccountDisplayName
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: Url
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPAddress
- entityType: CloudApplication
  fieldMappings:
  - identifier: Name
    columnName: Application
  - identifier: AppId
    columnName: ApplicationID
relevantTechniques:
- T1071
name: TI map URL entity to Cloud App Events
description: |
    'Identifies compromises and attacks and detect malicious activities in one's URL entity from TI'
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  ThreatIntelIndicators
  //extract key part of kv pair
  | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
  | where IndicatorType == "url"
  | extend Url = ObservableValue
  | extend IndicatorId = tostring(split(Id, "--")[2])
  | where TimeGenerated >= ago(ioc_lookBack)
  | where isnotempty(Url)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where IsActive == true and ValidUntil > now()
  | join kind=innerunique (CloudAppEvents
  | where TimeGenerated >= ago(dt_lookBack)
  | extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)", 1, tostring(ActivityObjects))
  | extend userPrincipalName = tostring(RawEventData.UserId)
  | extend TargetResourceDisplayName = tostring(ActivityObjects[0].displayName)
  | extend CloudApps_TimeGenerated = TimeGenerated) on Url
  | where CloudApps_TimeGenerated < ValidUntil
  | summarize CloudApps_TimeGenerated = argmax(CloudApps_TimeGenerated, *) by IndicatorId, Url
  | extend 
    Description = column_ifexists("max_CloudApps_TimeGenerated_Description", ""),
    ActivityGroupNames = column_ifexists("max_CloudApps_TimeGenerated_ActivityGroupNames", ""),
    ThreatType = column_ifexists("max_CloudApps_TimeGenerated_ThreatType", ""),
    ExpirationDateTime = column_ifexists("max_CloudApps_TimeGenerated_ExpirationDateTime", ""),
    ConfidenceScore = column_ifexists("max_CloudApps_TimeGenerated_ConfidenceScore", ""),
    IPAddress = column_ifexists("max_CloudApps_TimeGenerated_IPAddress", ""),
    AccountObjectId = column_ifexists("max_CloudApps_TimeGenerated_AccountObjectId", ""),
    AccountDisplayName = column_ifexists("max_CloudApps_TimeGenerated_AccountDisplayName", ""),
    ObjectName = column_ifexists("max_CloudApps_TimeGenerated_ObjectName", ""),
    Application = column_ifexists("max_CloudApps_TimeGenerated_Application", ""),
    ApplicationID = column_ifexists("max_CloudApps_TimeGenerated_ApplicationId", ""),
    userPrincipalName = column_ifexists("max_CloudApps_TimeGenerated_userPrincipalName", "")
  | project CloudApps_TimeGenerated, Description, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, IPAddress, userPrincipalName, AccountObjectId, AccountDisplayName, ObjectName, Application, ApplicationID  
queryPeriod: 14d
triggerOperator: gt
severity: Medium
tactics:
- CommandAndControl
id: 526df43b-f514-477c-af7a-c8d3586457fb
version: 1.0.4
kind: Scheduled
triggerThreshold: 0

{
  "$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/526df43b-f514-477c-af7a-c8d3586457fb')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/526df43b-f514-477c-af7a-c8d3586457fb')]",
      "properties": {
        "alertRuleTemplateName": "526df43b-f514-477c-af7a-c8d3586457fb",
        "customDetails": null,
        "description": "'Identifies compromises and attacks and detect malicious activities in one's URL entity from TI'\n",
        "displayName": "TI map URL entity to Cloud App Events",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountObjectId",
                "identifier": "ObjectGuid"
              },
              {
                "columnName": "userPrincipalName",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountDisplayName",
                "identifier": "DisplayName"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPAddress",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "Application",
                "identifier": "Name"
              },
              {
                "columnName": "ApplicationID",
                "identifier": "AppId"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/URLEntity_CloudAppEvents_Updated.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nThreatIntelIndicators\n//extract key part of kv pair\n| extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n| where IndicatorType == \"url\"\n| extend Url = ObservableValue\n| extend IndicatorId = tostring(split(Id, \"--\")[2])\n| where TimeGenerated >= ago(ioc_lookBack)\n| where isnotempty(Url)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where IsActive == true and ValidUntil > now()\n| join kind=innerunique (CloudAppEvents\n| where TimeGenerated >= ago(dt_lookBack)\n| extend Url = extract(\"(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\\\(\\\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)\", 1, tostring(ActivityObjects))\n| extend userPrincipalName = tostring(RawEventData.UserId)\n| extend TargetResourceDisplayName = tostring(ActivityObjects[0].displayName)\n| extend CloudApps_TimeGenerated = TimeGenerated) on Url\n| where CloudApps_TimeGenerated < ValidUntil\n| summarize CloudApps_TimeGenerated = argmax(CloudApps_TimeGenerated, *) by IndicatorId, Url\n| extend \n  Description = column_ifexists(\"max_CloudApps_TimeGenerated_Description\", \"\"),\n  ActivityGroupNames = column_ifexists(\"max_CloudApps_TimeGenerated_ActivityGroupNames\", \"\"),\n  ThreatType = column_ifexists(\"max_CloudApps_TimeGenerated_ThreatType\", \"\"),\n  ExpirationDateTime = column_ifexists(\"max_CloudApps_TimeGenerated_ExpirationDateTime\", \"\"),\n  ConfidenceScore = column_ifexists(\"max_CloudApps_TimeGenerated_ConfidenceScore\", \"\"),\n  IPAddress = column_ifexists(\"max_CloudApps_TimeGenerated_IPAddress\", \"\"),\n  AccountObjectId = column_ifexists(\"max_CloudApps_TimeGenerated_AccountObjectId\", \"\"),\n  AccountDisplayName = column_ifexists(\"max_CloudApps_TimeGenerated_AccountDisplayName\", \"\"),\n  ObjectName = column_ifexists(\"max_CloudApps_TimeGenerated_ObjectName\", \"\"),\n  Application = column_ifexists(\"max_CloudApps_TimeGenerated_Application\", \"\"),\n  ApplicationID = column_ifexists(\"max_CloudApps_TimeGenerated_ApplicationId\", \"\"),\n  userPrincipalName = column_ifexists(\"max_CloudApps_TimeGenerated_userPrincipalName\", \"\")\n| project CloudApps_TimeGenerated, Description, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, IPAddress, userPrincipalName, AccountObjectId, AccountDisplayName, ObjectName, Application, ApplicationID\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.0.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}