TI map IP entity to AzureFirewall

let dt_lookBack = 1h; // Look back 1 hour for AzureDiagnostics 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 AzureDiagnostics logs to identify potential malicious activity
IP_Indicators
  // Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation
  | join kind=innerunique (
      AzureDiagnostics
      | where TimeGenerated >= ago(dt_lookBack)
      | where OperationName in ("AzureFirewallApplicationRuleLog", "AzureFirewallNetworkRuleLog")
      | parse kind=regex flags=U msg_s with Protocol 'request from ' SourceHost 'to ' DestinationHost @'\.? Action: ' Firewall_Action @'\.' Rest_msg
      | extend SourceAddress = extract(@'([\.0-9]+)(:[\.0-9]+)?', 1, SourceHost)
      | extend DestinationAddress = extract(@'([\.0-9]+)(:[\.0-9]+)?', 1, DestinationHost)
      | extend RemoteIP = case(not(ipv4_is_private(DestinationAddress)), DestinationAddress, not(ipv4_is_private(SourceAddress)), SourceAddress, "")
      | where isnotempty(RemoteIP) // Filter out traffic involving public addresses only
      | project-rename AzureFirewall_TimeGenerated = TimeGenerated
  )
  on $left.TI_ipEntity == $right.RemoteIP
  // Filter out logs that occurred after the expiration of the corresponding indicator
  | where AzureFirewall_TimeGenerated < ExpirationDateTime
  // Group the results by IndicatorId and RemoteIP, and keep the log entry with the latest timestamp
  | summarize AzureFirewall_TimeGenerated = arg_max(AzureFirewall_TimeGenerated, *) by IndicatorId, RemoteIP
  // Select the desired output fields
  | project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, DomainName, ExpirationDateTime, ConfidenceScore,
    AzureFirewall_TimeGenerated, TI_ipEntity, Resource, Category, msg_s, SourceAddress, DestinationAddress, Firewall_Action, Protocol,
    NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
  // Rename the timestamp field
  | extend timestamp = AzureFirewall_TimeGenerated

query: |
  let dt_lookBack = 1h; // Look back 1 hour for AzureDiagnostics 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 AzureDiagnostics logs to identify potential malicious activity
  IP_Indicators
    // Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation
    | join kind=innerunique (
        AzureDiagnostics
        | where TimeGenerated >= ago(dt_lookBack)
        | where OperationName in ("AzureFirewallApplicationRuleLog", "AzureFirewallNetworkRuleLog")
        | parse kind=regex flags=U msg_s with Protocol 'request from ' SourceHost 'to ' DestinationHost @'\.? Action: ' Firewall_Action @'\.' Rest_msg
        | extend SourceAddress = extract(@'([\.0-9]+)(:[\.0-9]+)?', 1, SourceHost)
        | extend DestinationAddress = extract(@'([\.0-9]+)(:[\.0-9]+)?', 1, DestinationHost)
        | extend RemoteIP = case(not(ipv4_is_private(DestinationAddress)), DestinationAddress, not(ipv4_is_private(SourceAddress)), SourceAddress, "")
        | where isnotempty(RemoteIP) // Filter out traffic involving public addresses only
        | project-rename AzureFirewall_TimeGenerated = TimeGenerated
    )
    on $left.TI_ipEntity == $right.RemoteIP
    // Filter out logs that occurred after the expiration of the corresponding indicator
    | where AzureFirewall_TimeGenerated < ExpirationDateTime
    // Group the results by IndicatorId and RemoteIP, and keep the log entry with the latest timestamp
    | summarize AzureFirewall_TimeGenerated = arg_max(AzureFirewall_TimeGenerated, *) by IndicatorId, RemoteIP
    // Select the desired output fields
    | project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, DomainName, ExpirationDateTime, ConfidenceScore,
      AzureFirewall_TimeGenerated, TI_ipEntity, Resource, Category, msg_s, SourceAddress, DestinationAddress, Firewall_Action, Protocol,
      NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
    // Rename the timestamp field
    | extend timestamp = AzureFirewall_TimeGenerated  
queryPeriod: 14d
name: TI map IP entity to AzureFirewall
id: 0b904747-1336-4363-8d84-df2710bfe5e7
relevantTechniques:
- T1071
requiredDataConnectors:
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: AzureFirewall
  dataTypes:
  - AzureDiagnostics
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
severity: Medium
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AzureFirewall.yaml
version: 1.3.2
tactics:
- CommandAndControl
kind: Scheduled
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: TI_ipEntity
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: Url
triggerThreshold: 0
description: |
    Identifies a match in AzureFirewall (NetworkRule & ApplicationRule Logs) from any IP IOC from TI
queryFrequency: 1h

{
  "$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/0b904747-1336-4363-8d84-df2710bfe5e7')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/0b904747-1336-4363-8d84-df2710bfe5e7')]",
      "properties": {
        "alertRuleTemplateName": "0b904747-1336-4363-8d84-df2710bfe5e7",
        "customDetails": null,
        "description": "Identifies a match in AzureFirewall (NetworkRule & ApplicationRule Logs) from any IP IOC from TI\n",
        "displayName": "TI map IP entity to AzureFirewall",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "TI_ipEntity",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AzureFirewall.yaml",
        "query": "let dt_lookBack = 1h; // Look back 1 hour for AzureDiagnostics 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 AzureDiagnostics logs to identify potential malicious activity\nIP_Indicators\n  // Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation\n  | join kind=innerunique (\n      AzureDiagnostics\n      | where TimeGenerated >= ago(dt_lookBack)\n      | where OperationName in (\"AzureFirewallApplicationRuleLog\", \"AzureFirewallNetworkRuleLog\")\n      | parse kind=regex flags=U msg_s with Protocol 'request from ' SourceHost 'to ' DestinationHost @'\\.? Action: ' Firewall_Action @'\\.' Rest_msg\n      | extend SourceAddress = extract(@'([\\.0-9]+)(:[\\.0-9]+)?', 1, SourceHost)\n      | extend DestinationAddress = extract(@'([\\.0-9]+)(:[\\.0-9]+)?', 1, DestinationHost)\n      | extend RemoteIP = case(not(ipv4_is_private(DestinationAddress)), DestinationAddress, not(ipv4_is_private(SourceAddress)), SourceAddress, \"\")\n      | where isnotempty(RemoteIP) // Filter out traffic involving public addresses only\n      | project-rename AzureFirewall_TimeGenerated = TimeGenerated\n  )\n  on $left.TI_ipEntity == $right.RemoteIP\n  // Filter out logs that occurred after the expiration of the corresponding indicator\n  | where AzureFirewall_TimeGenerated < ExpirationDateTime\n  // Group the results by IndicatorId and RemoteIP, and keep the log entry with the latest timestamp\n  | summarize AzureFirewall_TimeGenerated = arg_max(AzureFirewall_TimeGenerated, *) by IndicatorId, RemoteIP\n  // Select the desired output fields\n  | project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, DomainName, ExpirationDateTime, ConfidenceScore,\n    AzureFirewall_TimeGenerated, TI_ipEntity, Resource, Category, msg_s, SourceAddress, DestinationAddress, Firewall_Action, Protocol,\n    NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type\n  // Rename the timestamp field\n  | extend timestamp = AzureFirewall_TimeGenerated\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.3.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}