TI Map Domain entity to Dns Events ASIM DNS Schema

let HAS_ANY_MAX = 10000;
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let DomainTIs= ThreatIntelIndicators
  // Picking up only IOC's that contain the entities we want
  //extract key part of kv pair
  | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
  | extend IndicatorId = tostring(split(Id, "--")[2])
  | where IndicatorType == "domain-name"
  | extend DomainName = ObservableValue
  | extend Url = iff(ObservableKey == "url:value", ObservableValue, "")
  
  | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
  | extend ThreatList = tostring(parse_json(Data).indicator_types[0])
  | where TimeGenerated >= ago(ioc_lookBack)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId, ObservableValue
  | where IsActive and (ValidUntil > now() or isempty(ValidUntil));
let Domains = DomainTIs  |summarize NDomains=dcount(DomainName), DomainsList=make_set(DomainName) 
  | project DomainList = iff(NDomains > HAS_ANY_MAX, dynamic([]), DomainsList);
DomainTIs
| project-reorder *, ThreatList, IsActive, Tags, TrafficLightProtocolLevel, DomainName, Type
  | join (
      _Im_Dns(starttime=ago(dt_lookBack), domain_has_any=toscalar(Domains))
      | extend DNS_TimeGenerated = TimeGenerated
) on $left.DomainName==$right.DnsQuery
| where DNS_TimeGenerated < ValidUntil
| extend Description = tostring(parse_json(Data).description)
| extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
| project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ValidUntil, Confidence, DNS_TimeGenerated, Dvc, SrcIpAddr, Domain, DnsQuery, DnsQueryType, Url
| extend HostName = tostring(split(Dvc, ".")[0]), DomainIndex = toint(indexof(Dvc, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)

name: TI Map Domain entity to Dns Events (ASIM DNS Schema)
triggerOperator: gt
query: "let HAS_ANY_MAX = 10000;\nlet dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet DomainTIs= ThreatIntelIndicators\n  // Picking up only IOC's that contain the entities we want\n  //extract key part of kv pair\n  | extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n  | extend IndicatorId = tostring(split(Id, \"--\")[2])\n  | where IndicatorType == \"domain-name\"\n  | extend DomainName = ObservableValue\n  | extend Url = iff(ObservableKey == \"url:value\", ObservableValue, \"\")\n  \n  | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)\n  | extend ThreatList = tostring(parse_json(Data).indicator_types[0])\n  | where TimeGenerated >= ago(ioc_lookBack)\n  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId, ObservableValue\n  | where IsActive and (ValidUntil > now() or isempty(ValidUntil));\nlet Domains = DomainTIs  |summarize NDomains=dcount(DomainName), DomainsList=make_set(DomainName) \n  | project DomainList = iff(NDomains > HAS_ANY_MAX, dynamic([]), DomainsList);\nDomainTIs\n| project-reorder *, ThreatList, IsActive, Tags, TrafficLightProtocolLevel, DomainName, Type\n  | join (\n      _Im_Dns(starttime=ago(dt_lookBack), domain_has_any=toscalar(Domains))\n      | extend DNS_TimeGenerated = TimeGenerated\n) on $left.DomainName==$right.DnsQuery\n| where DNS_TimeGenerated < ValidUntil\n| extend Description = tostring(parse_json(Data).description)\n| extend ActivityGroupNames = extract(@\"ActivityGroup:(\\S+)\", 1, tostring(parse_json(Data).labels))\n| project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ValidUntil, Confidence, DNS_TimeGenerated, Dvc, SrcIpAddr, Domain, DnsQuery, DnsQueryType, Url\n| extend HostName = tostring(split(Dvc, \".\")[0]), DomainIndex = toint(indexof(Dvc, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)\n"
queryFrequency: 1h
description: |
  Identifies a match in DNS events from any Domain IOC from TI
  This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM DNS schema'
id: 7c1ea2e6-6210-412c-92e4-180803a741b4
triggerThreshold: 0
queryPeriod: 14d
version: 1.2.4
kind: Scheduled
customDetails:
  DNSRequestTime: DNS_TimeGenerated
  IndicatorId: IndicatorId
  Description: Description
  ConfidenceScore: Confidence
  ActivityGroupNames: ActivityGroupNames
  ExpirationDateTime: ValidUntil
  LatestIndicatorTime: LatestIndicatorTime
  DnsQuery: DnsQuery
  QueryType: DnsQueryType
  SourceIPAddress: SrcIpAddr
relevantTechniques:
- T1071
tags:
- version: 1.0.0
  Id: 85aca4d1-5d15-4001-abd9-acb86ca1786a
- SchemaVersion: 0.1.1
  Schema: ASIMDns
severity: Medium
requiredDataConnectors:
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelIndicators
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelIndicators
- connectorId: DNS
  dataTypes:
  - DnsEvents
- connectorId: AzureFirewall
  dataTypes:
  - AzureDiagnostics
- connectorId: Zscaler
  dataTypes:
  - CommonSecurityLog
- connectorId: InfobloxNIOS
  dataTypes:
  - Syslog
- connectorId: GCPDNSDataConnector
  dataTypes:
  - GCP_DNS_CL
- connectorId: NXLogDnsLogs
  dataTypes:
  - NXLog_DNS_Server_CL
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelIndicators
- connectorId: CiscoUmbrellaDataConnector
  dataTypes:
  - Cisco_Umbrella_dns_CL
- connectorId: Corelight
  dataTypes:
  - Corelight_CL
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat%20Intelligence%20%28NEW%29/Analytic%20Rules/imDns_DomainEntity_DnsEvents.yaml
tactics:
- CommandAndControl
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: Dvc
  - identifier: HostName
    columnName: HostName
  - identifier: DnsDomain
    columnName: HostNameDomain
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: Url
  entityType: URL
- fieldMappings:
  - identifier: DomainName
    columnName: Domain
  entityType: DNS

{
  "$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/7c1ea2e6-6210-412c-92e4-180803a741b4')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7c1ea2e6-6210-412c-92e4-180803a741b4')]",
      "properties": {
        "alertRuleTemplateName": "7c1ea2e6-6210-412c-92e4-180803a741b4",
        "customDetails": {
          "ActivityGroupNames": "ActivityGroupNames",
          "ConfidenceScore": "Confidence",
          "Description": "Description",
          "DnsQuery": "DnsQuery",
          "DNSRequestTime": "DNS_TimeGenerated",
          "ExpirationDateTime": "ValidUntil",
          "IndicatorId": "IndicatorId",
          "LatestIndicatorTime": "LatestIndicatorTime",
          "QueryType": "DnsQueryType",
          "SourceIPAddress": "SrcIpAddr"
        },
        "description": "Identifies a match in DNS events from any Domain IOC from TI\nThis analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM DNS schema'\n",
        "displayName": "TI Map Domain entity to Dns Events (ASIM DNS Schema)",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Dvc",
                "identifier": "FullName"
              },
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "HostNameDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SrcIpAddr",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "DNS",
            "fieldMappings": [
              {
                "columnName": "Domain",
                "identifier": "DomainName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat%20Intelligence%20%28NEW%29/Analytic%20Rules/imDns_DomainEntity_DnsEvents.yaml",
        "query": "let HAS_ANY_MAX = 10000;\nlet dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet DomainTIs= ThreatIntelIndicators\n  // Picking up only IOC's that contain the entities we want\n  //extract key part of kv pair\n  | extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n  | extend IndicatorId = tostring(split(Id, \"--\")[2])\n  | where IndicatorType == \"domain-name\"\n  | extend DomainName = ObservableValue\n  | extend Url = iff(ObservableKey == \"url:value\", ObservableValue, \"\")\n  \n  | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)\n  | extend ThreatList = tostring(parse_json(Data).indicator_types[0])\n  | where TimeGenerated >= ago(ioc_lookBack)\n  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId, ObservableValue\n  | where IsActive and (ValidUntil > now() or isempty(ValidUntil));\nlet Domains = DomainTIs  |summarize NDomains=dcount(DomainName), DomainsList=make_set(DomainName) \n  | project DomainList = iff(NDomains > HAS_ANY_MAX, dynamic([]), DomainsList);\nDomainTIs\n| project-reorder *, ThreatList, IsActive, Tags, TrafficLightProtocolLevel, DomainName, Type\n  | join (\n      _Im_Dns(starttime=ago(dt_lookBack), domain_has_any=toscalar(Domains))\n      | extend DNS_TimeGenerated = TimeGenerated\n) on $left.DomainName==$right.DnsQuery\n| where DNS_TimeGenerated < ValidUntil\n| extend Description = tostring(parse_json(Data).description)\n| extend ActivityGroupNames = extract(@\"ActivityGroup:(\\S+)\", 1, tostring(parse_json(Data).labels))\n| project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ValidUntil, Confidence, DNS_TimeGenerated, Dvc, SrcIpAddr, Domain, DnsQuery, DnsQueryType, Url\n| extend HostName = tostring(split(Dvc, \".\")[0]), DomainIndex = toint(indexof(Dvc, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "tags": [
          {
            "Id": "85aca4d1-5d15-4001-abd9-acb86ca1786a",
            "version": "1.0.0"
          },
          {
            "Schema": "ASIMDns",
            "SchemaVersion": "0.1.1"
          }
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.2.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}