TI Map IP Entity to W3CIISLog

let dt_lookBack = 1h; // Look back 1 hour for W3CIISLog events
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 isnotempty(IndicatorType) and IndicatorType == "ipv4-addr"
     | extend NetworkSourceIP = toupper(ObservableValue)
     | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
  | where isnotempty(NetworkSourceIP)
  | where TimeGenerated >= ago(ioc_lookBack)
  | 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)
  | 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 W3CIISLog events
IP_Indicators
  | project-reorder *, Tags, TrafficLightProtocolLevel, NetworkSourceIP, Type, TI_ipEntity
  // 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 (
      W3CIISLog
      | where TimeGenerated >= ago(dt_lookBack)
      | where isnotempty(cIP)
      | where ipv4_is_private(cIP) == false and cIP !startswith "fe80" and cIP !startswith "::" and cIP !startswith "127."
      | extend W3CIISLog_TimeGenerated = TimeGenerated
  )
  on $left.TI_ipEntity == $right.cIP
  // Filter out W3CIISLog events that occurred after the expiration of the corresponding indicator
  | where W3CIISLog_TimeGenerated < ValidUntil
  // Group the results by IndicatorId and keep the W3CIISLog event with the latest timestamp
  | summarize W3CIISLog_TimeGenerated = arg_max(W3CIISLog_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 timestamp = W3CIISLog_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence,
    TI_ipEntity, Computer, sSiteName, cIP, sIP, sPort, csMethod, csUserName, scStatus, scSubStatus, scWin32Status,
   NetworkSourceIP, Type, Url//, ThreatType, NetworkIP, NetworkDestinationIP, EmailSourceIpAddress,

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/IPEntity_W3CIISLog.yaml
query: |
  let dt_lookBack = 1h; // Look back 1 hour for W3CIISLog events
  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 isnotempty(IndicatorType) and IndicatorType == "ipv4-addr"
       | extend NetworkSourceIP = toupper(ObservableValue)
       | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
    | where isnotempty(NetworkSourceIP)
    | where TimeGenerated >= ago(ioc_lookBack)
    | 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)
    | 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 W3CIISLog events
  IP_Indicators
    | project-reorder *, Tags, TrafficLightProtocolLevel, NetworkSourceIP, Type, TI_ipEntity
    // 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 (
        W3CIISLog
        | where TimeGenerated >= ago(dt_lookBack)
        | where isnotempty(cIP)
        | where ipv4_is_private(cIP) == false and cIP !startswith "fe80" and cIP !startswith "::" and cIP !startswith "127."
        | extend W3CIISLog_TimeGenerated = TimeGenerated
    )
    on $left.TI_ipEntity == $right.cIP
    // Filter out W3CIISLog events that occurred after the expiration of the corresponding indicator
    | where W3CIISLog_TimeGenerated < ValidUntil
    // Group the results by IndicatorId and keep the W3CIISLog event with the latest timestamp
    | summarize W3CIISLog_TimeGenerated = arg_max(W3CIISLog_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 timestamp = W3CIISLog_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence,
      TI_ipEntity, Computer, sSiteName, cIP, sIP, sPort, csMethod, csUserName, scStatus, scSubStatus, scWin32Status,
     NetworkSourceIP, Type, Url//, ThreatType, NetworkIP, NetworkDestinationIP, EmailSourceIpAddress,  
description: |
    This query maps any IP indicators of compromise (IOCs) from threat intelligence (TI), by searching for matches in W3CIISLog.
severity: Medium
requiredDataConnectors:
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
- dataTypes:
  - W3CIISLog
  connectorId: AzureMonitor(IIS)
name: TI Map IP Entity to W3CIISLog
triggerThreshold: 0
tactics:
- CommandAndControl
version: 1.4.3
relevantTechniques:
- T1071
triggerOperator: gt
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: csUserName
    identifier: Name
- entityType: Host
  fieldMappings:
  - columnName: Computer
    identifier: HostName
- entityType: IP
  fieldMappings:
  - columnName: cIP
    identifier: Address
- entityType: URL
  fieldMappings:
  - columnName: Url
    identifier: Url
id: 888c4736-e604-48eb-b2c7-3462356d9510
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/888c4736-e604-48eb-b2c7-3462356d9510')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/888c4736-e604-48eb-b2c7-3462356d9510')]",
      "properties": {
        "alertRuleTemplateName": "888c4736-e604-48eb-b2c7-3462356d9510",
        "customDetails": null,
        "description": "This query maps any IP indicators of compromise (IOCs) from threat intelligence (TI), by searching for matches in W3CIISLog.\n",
        "displayName": "TI Map IP Entity to W3CIISLog",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "csUserName",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "cIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/IPEntity_W3CIISLog.yaml",
        "query": "let dt_lookBack = 1h; // Look back 1 hour for W3CIISLog events\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 isnotempty(IndicatorType) and IndicatorType == \"ipv4-addr\"\n     | extend NetworkSourceIP = toupper(ObservableValue)\n     | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)\n  | where isnotempty(NetworkSourceIP)\n  | where TimeGenerated >= ago(ioc_lookBack)\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  | 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 W3CIISLog events\nIP_Indicators\n  | project-reorder *, Tags, TrafficLightProtocolLevel, NetworkSourceIP, Type, TI_ipEntity\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      W3CIISLog\n      | where TimeGenerated >= ago(dt_lookBack)\n      | where isnotempty(cIP)\n      | where ipv4_is_private(cIP) == false and cIP !startswith \"fe80\" and cIP !startswith \"::\" and cIP !startswith \"127.\"\n      | extend W3CIISLog_TimeGenerated = TimeGenerated\n  )\n  on $left.TI_ipEntity == $right.cIP\n  // Filter out W3CIISLog events that occurred after the expiration of the corresponding indicator\n  | where W3CIISLog_TimeGenerated < ValidUntil\n  // Group the results by IndicatorId and keep the W3CIISLog event with the latest timestamp\n  | summarize W3CIISLog_TimeGenerated = arg_max(W3CIISLog_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 timestamp = W3CIISLog_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence,\n    TI_ipEntity, Computer, sSiteName, cIP, sIP, sPort, csMethod, csUserName, scStatus, scSubStatus, scWin32Status,\n   NetworkSourceIP, Type, Url//, ThreatType, NetworkIP, NetworkDestinationIP, EmailSourceIpAddress,\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"
    }
  ]
}