TI map IP entity to AppServiceHTTPLogs

let dt_lookBack = 1h; // Look back 1 hour for AppServiceHTTPLogs
let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
// Fetch threat intelligence indicators related to IP addresses
let IP_Indicators = ThreatIntelIndicators
  //extract key part of kv pair
  | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
  | where IndicatorType == "ipv4-addr"
  | extend NetworkSourceIP = ObservableValue
  | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
  // Filter out indicators without relevant IP address fields
  | where isnotempty(NetworkSourceIP) //or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
  | where TimeGenerated >= ago(ioc_lookBack)
  | where TimeGenerated >= ago(ioc_lookBack)
  // Filtering out rows where the Confidence Score is less than 50 as they would not have an Alert Priority label. 
  | where Confidence > 50
  // Select the IP entity based on availability of different IP fields
  | extend TI_ipEntity = iff(isnotempty(NetworkSourceIP), NetworkSourceIP, NetworkSourceIP)
  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
  | extend Url = iff(ObservableKey == "url:value", ObservableValue, "")
  //| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)
  // Determine AlertPriority based on ConfidenceScore
  | extend AlertPriority = case(Confidence > 82, "High",
                                Confidence > 74, "Medium",
                                "Low")
  // 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 Id
  | where IsActive == true and ValidUntil > now();
  // Perform a join between IP indicators and AppServiceHTTPLogs to identify potential malicious activity
IP_Indicators
| project-reorder *, IsActive, Tags, TrafficLightProtocolLevel, NetworkSourceIP, Type, TI_ipEntity, AlertPriority
  // 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 (
    AppServiceHTTPLogs | where TimeGenerated >= ago(dt_lookBack)
    | where isnotempty(CIp)
    | extend WebApp = split(_ResourceId, '/')[8]
    | extend AppService_TimeGenerated = TimeGenerated // Rename time column for clarity
  )
  on $left.TI_ipEntity == $right.CIp
  // Filter out logs that occurred after the expiration of the corresponding indicator
  | where AppService_TimeGenerated < ValidUntil
  // Group the results by IndicatorId and CIp, and keep the log entry with the latest timestamp
  | summarize AppService_TimeGenerated = arg_max(AppService_TimeGenerated, *) by Id, CIp
  // Select the desired output fields
  | extend Description = tostring(parse_json(Data).description)
  | extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
  | project AppService_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence, TI_ipEntity, CsUsername, WebApp = split(_ResourceId, '/')[8], CIp, CsHost, NetworkSourceIP, _ResourceId, Type, Url//, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress
  // Extract hostname and DNS domain from the CsHost field
  | extend HostName = tostring(split(CsHost, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(CsHost, '.'), 1, -1), '.'))
  // Rename the timestamp field
  | extend timestamp = AppService_TimeGenerated

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/IPEntity_AppServiceHTTPLogs.yaml
query: |
  let dt_lookBack = 1h; // Look back 1 hour for AppServiceHTTPLogs
  let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
  // Fetch threat intelligence indicators related to IP addresses
  let IP_Indicators = ThreatIntelIndicators
    //extract key part of kv pair
    | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
    | where IndicatorType == "ipv4-addr"
    | extend NetworkSourceIP = ObservableValue
    | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
    // Filter out indicators without relevant IP address fields
    | where isnotempty(NetworkSourceIP) //or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
    | where TimeGenerated >= ago(ioc_lookBack)
    | where TimeGenerated >= ago(ioc_lookBack)
    // Filtering out rows where the Confidence Score is less than 50 as they would not have an Alert Priority label. 
    | where Confidence > 50
    // Select the IP entity based on availability of different IP fields
    | extend TI_ipEntity = iff(isnotempty(NetworkSourceIP), NetworkSourceIP, NetworkSourceIP)
    | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
    | extend Url = iff(ObservableKey == "url:value", ObservableValue, "")
    //| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)
    // Determine AlertPriority based on ConfidenceScore
    | extend AlertPriority = case(Confidence > 82, "High",
                                  Confidence > 74, "Medium",
                                  "Low")
    // 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 Id
    | where IsActive == true and ValidUntil > now();
    // Perform a join between IP indicators and AppServiceHTTPLogs to identify potential malicious activity
  IP_Indicators
  | project-reorder *, IsActive, Tags, TrafficLightProtocolLevel, NetworkSourceIP, Type, TI_ipEntity, AlertPriority
    // 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 (
      AppServiceHTTPLogs | where TimeGenerated >= ago(dt_lookBack)
      | where isnotempty(CIp)
      | extend WebApp = split(_ResourceId, '/')[8]
      | extend AppService_TimeGenerated = TimeGenerated // Rename time column for clarity
    )
    on $left.TI_ipEntity == $right.CIp
    // Filter out logs that occurred after the expiration of the corresponding indicator
    | where AppService_TimeGenerated < ValidUntil
    // Group the results by IndicatorId and CIp, and keep the log entry with the latest timestamp
    | summarize AppService_TimeGenerated = arg_max(AppService_TimeGenerated, *) by Id, CIp
    // Select the desired output fields
    | extend Description = tostring(parse_json(Data).description)
    | extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
    | project AppService_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence, TI_ipEntity, CsUsername, WebApp = split(_ResourceId, '/')[8], CIp, CsHost, NetworkSourceIP, _ResourceId, Type, Url//, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress
    // Extract hostname and DNS domain from the CsHost field
    | extend HostName = tostring(split(CsHost, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(CsHost, '.'), 1, -1), '.'))
    // Rename the timestamp field
    | extend timestamp = AppService_TimeGenerated  
description: |
    Identifies a match in AppServiceHTTPLogs from any IP IOC from TI
severity: Medium
requiredDataConnectors:
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
name: TI map IP entity to AppServiceHTTPLogs
triggerThreshold: 0
version: 1.5.3
tactics:
- CommandAndControl
alertDetailsOverride:
  alertSeverityColumnName: AlertPriority
relevantTechniques:
- T1071
triggerOperator: gt
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
- entityType: Account
  fieldMappings:
  - columnName: CsUsername
    identifier: Name
- entityType: IP
  fieldMappings:
  - columnName: CIp
    identifier: Address
- entityType: URL
  fieldMappings:
  - columnName: Url
    identifier: Url
- entityType: AzureResource
  fieldMappings:
  - columnName: _ResourceId
    identifier: ResourceId
id: 206277b1-9a2c-4c62-9ee8-a4c888810d3c
kind: Scheduled
queryFrequency: 1h
queryPeriod: 14d

{
  "$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/206277b1-9a2c-4c62-9ee8-a4c888810d3c')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/206277b1-9a2c-4c62-9ee8-a4c888810d3c')]",
      "properties": {
        "alertDetailsOverride": {
          "alertSeverityColumnName": "AlertPriority"
        },
        "alertRuleTemplateName": "206277b1-9a2c-4c62-9ee8-a4c888810d3c",
        "customDetails": null,
        "description": "Identifies a match in AppServiceHTTPLogs from any IP IOC from TI\n",
        "displayName": "TI map IP entity to AppServiceHTTPLogs",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "DnsDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "CsUsername",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "CIp",
                "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 (NEW)/Analytic Rules/IPEntity_AppServiceHTTPLogs.yaml",
        "query": "let dt_lookBack = 1h; // Look back 1 hour for AppServiceHTTPLogs\nlet ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators\n// Fetch threat intelligence indicators related to IP addresses\nlet IP_Indicators = ThreatIntelIndicators\n  //extract key part of kv pair\n  | extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n  | where IndicatorType == \"ipv4-addr\"\n  | extend NetworkSourceIP = ObservableValue\n  | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)\n  // Filter out indicators without relevant IP address fields\n  | where isnotempty(NetworkSourceIP) //or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)\n  | where TimeGenerated >= ago(ioc_lookBack)\n  | where TimeGenerated >= ago(ioc_lookBack)\n  // Filtering out rows where the Confidence Score is less than 50 as they would not have an Alert Priority label. \n  | where Confidence > 50\n  // Select the IP entity based on availability of different IP fields\n  | extend TI_ipEntity = iff(isnotempty(NetworkSourceIP), NetworkSourceIP, NetworkSourceIP)\n  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)\n  | extend Url = iff(ObservableKey == \"url:value\", ObservableValue, \"\")\n  //| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)\n  // Determine AlertPriority based on ConfidenceScore\n  | extend AlertPriority = case(Confidence > 82, \"High\",\n                                Confidence > 74, \"Medium\",\n                                \"Low\")\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 Id\n  | where IsActive == true and ValidUntil > now();\n  // Perform a join between IP indicators and AppServiceHTTPLogs to identify potential malicious activity\nIP_Indicators\n| project-reorder *, IsActive, Tags, TrafficLightProtocolLevel, NetworkSourceIP, Type, TI_ipEntity, AlertPriority\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    AppServiceHTTPLogs | where TimeGenerated >= ago(dt_lookBack)\n    | where isnotempty(CIp)\n    | extend WebApp = split(_ResourceId, '/')[8]\n    | extend AppService_TimeGenerated = TimeGenerated // Rename time column for clarity\n  )\n  on $left.TI_ipEntity == $right.CIp\n  // Filter out logs that occurred after the expiration of the corresponding indicator\n  | where AppService_TimeGenerated < ValidUntil\n  // Group the results by IndicatorId and CIp, and keep the log entry with the latest timestamp\n  | summarize AppService_TimeGenerated = arg_max(AppService_TimeGenerated, *) by Id, CIp\n  // Select the desired output fields\n  | extend Description = tostring(parse_json(Data).description)\n  | extend ActivityGroupNames = extract(@\"ActivityGroup:(\\S+)\", 1, tostring(parse_json(Data).labels))\n  | project AppService_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence, TI_ipEntity, CsUsername, WebApp = split(_ResourceId, '/')[8], CIp, CsHost, NetworkSourceIP, _ResourceId, Type, Url//, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress\n  // Extract hostname and DNS domain from the CsHost field\n  | extend HostName = tostring(split(CsHost, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(CsHost, '.'), 1, -1), '.'))\n  // Rename the timestamp field\n  | extend timestamp = AppService_TimeGenerated\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.5.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}