TI Map IP Entity to AzureActivity

let dt_lookBack = 1h; // Look back 1 hour for AzureActivity logs
let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
// Fetch threat intelligence indicators related to IP addresses
let IP_Indicators = ThreatIntelligenceIndicator
  // Filter out indicators without relevant IP address fields
  | where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
  | where TimeGenerated >= ago(ioc_lookBack)
  // Select the IP entity based on availability of different IP fields
  | extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)
  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)
  // Exclude local addresses using the ipv4_is_private operator and filtering out specific address prefixes
  | where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now();
// Perform a join between IP indicators and AzureActivity logs to identify potential malicious activity
IP_Indicators
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
    AzureActivity | where TimeGenerated >= ago(dt_lookBack)
    // renaming time column so it is clear the log this came from
    | extend AzureActivity_TimeGenerated = TimeGenerated
)
on $left.TI_ipEntity == $right.CallerIpAddress
| where AzureActivity_TimeGenerated < ExpirationDateTime
| summarize AzureActivity_TimeGenerated = arg_max(AzureActivity_TimeGenerated, *) by IndicatorId, CallerIpAddress
| project AzureActivity_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, TI_ipEntity, CallerIpAddress, 
Caller, OperationNameValue, ActivityStatusValue, CategoryValue, ResourceId, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
| extend timestamp = AzureActivity_TimeGenerated
| extend Name = iif(Caller has '@', tostring(split(Caller,'@',0)[0]), "")
| extend UPNSuffix = iif(Caller has '@', tostring(split(Caller,'@',1)[0]), "")
| extend AadUserId = iif(Caller !has '@', tostring(Caller), "")

relevantTechniques:
- T1071
name: TI Map IP Entity to AzureActivity
requiredDataConnectors:
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - AzureActivity
  connectorId: AzureActivity
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: Caller
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: AadUserId
    columnName: AadUserId
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: CallerIpAddress
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: Url
  entityType: URL
- fieldMappings:
  - identifier: ResourceId
    columnName: ResourceId
  entityType: AzureResource
triggerThreshold: 0
id: 2441bce9-02e4-407b-8cc7-7d597f38b8b0
tactics:
- CommandAndControl
version: 1.4.3
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AzureActivity.yaml
queryPeriod: 14d
kind: Scheduled
queryFrequency: 1h
severity: Medium
description: |
    This query maps any IP indicators of compromise (IOCs) from threat intelligence (TI), by searching for matches in AzureActivity.
query: |
  let dt_lookBack = 1h; // Look back 1 hour for AzureActivity logs
  let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
  // Fetch threat intelligence indicators related to IP addresses
  let IP_Indicators = ThreatIntelligenceIndicator
    // Filter out indicators without relevant IP address fields
    | where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
    | where TimeGenerated >= ago(ioc_lookBack)
    // Select the IP entity based on availability of different IP fields
    | extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)
    | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
    | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)
    // Exclude local addresses using the ipv4_is_private operator and filtering out specific address prefixes
    | where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now();
  // Perform a join between IP indicators and AzureActivity logs to identify potential malicious activity
  IP_Indicators
  // using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
  | join kind=innerunique (
      AzureActivity | where TimeGenerated >= ago(dt_lookBack)
      // renaming time column so it is clear the log this came from
      | extend AzureActivity_TimeGenerated = TimeGenerated
  )
  on $left.TI_ipEntity == $right.CallerIpAddress
  | where AzureActivity_TimeGenerated < ExpirationDateTime
  | summarize AzureActivity_TimeGenerated = arg_max(AzureActivity_TimeGenerated, *) by IndicatorId, CallerIpAddress
  | project AzureActivity_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, TI_ipEntity, CallerIpAddress, 
  Caller, OperationNameValue, ActivityStatusValue, CategoryValue, ResourceId, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
  | extend timestamp = AzureActivity_TimeGenerated
  | extend Name = iif(Caller has '@', tostring(split(Caller,'@',0)[0]), "")
  | extend UPNSuffix = iif(Caller has '@', tostring(split(Caller,'@',1)[0]), "")
  | extend AadUserId = iif(Caller !has '@', tostring(Caller), "")  
triggerOperator: gt

{
  "$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/2441bce9-02e4-407b-8cc7-7d597f38b8b0')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2441bce9-02e4-407b-8cc7-7d597f38b8b0')]",
      "properties": {
        "alertRuleTemplateName": "2441bce9-02e4-407b-8cc7-7d597f38b8b0",
        "customDetails": null,
        "description": "This query maps any IP indicators of compromise (IOCs) from threat intelligence (TI), by searching for matches in AzureActivity.\n",
        "displayName": "TI Map IP Entity to AzureActivity",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Caller",
                "identifier": "FullName"
              },
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AadUserId",
                "identifier": "AadUserId"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "CallerIpAddress",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "AzureResource",
            "fieldMappings": [
              {
                "columnName": "ResourceId",
                "identifier": "ResourceId"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AzureActivity.yaml",
        "query": "let dt_lookBack = 1h; // Look back 1 hour for AzureActivity logs\nlet ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators\n// Fetch threat intelligence indicators related to IP addresses\nlet IP_Indicators = ThreatIntelligenceIndicator\n  // Filter out indicators without relevant IP address fields\n  | where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)\n  | where TimeGenerated >= ago(ioc_lookBack)\n  // Select the IP entity based on availability of different IP fields\n  | extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)\n  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)\n  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)\n  // Exclude local addresses using the ipv4_is_private operator and filtering out specific address prefixes\n  | where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith \"fe80\" and TI_ipEntity !startswith \"::\" and TI_ipEntity !startswith \"127.\"\n  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n  | where Active == true and ExpirationDateTime > now();\n// Perform a join between IP indicators and AzureActivity logs to identify potential malicious activity\nIP_Indicators\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique (\n    AzureActivity | where TimeGenerated >= ago(dt_lookBack)\n    // renaming time column so it is clear the log this came from\n    | extend AzureActivity_TimeGenerated = TimeGenerated\n)\non $left.TI_ipEntity == $right.CallerIpAddress\n| where AzureActivity_TimeGenerated < ExpirationDateTime\n| summarize AzureActivity_TimeGenerated = arg_max(AzureActivity_TimeGenerated, *) by IndicatorId, CallerIpAddress\n| project AzureActivity_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, TI_ipEntity, CallerIpAddress, \nCaller, OperationNameValue, ActivityStatusValue, CategoryValue, ResourceId, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type\n| extend timestamp = AzureActivity_TimeGenerated\n| extend Name = iif(Caller has '@', tostring(split(Caller,'@',0)[0]), \"\")\n| extend UPNSuffix = iif(Caller has '@', tostring(split(Caller,'@',1)[0]), \"\")\n| extend AadUserId = iif(Caller !has '@', tostring(Caller), \"\")\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.4.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}