TI Map Domain Entity to DeviceNetworkEvents

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Id	c308b2f3-eebe-4a20-905c-cb8293b062db
Rulename	TI Map Domain Entity to DeviceNetworkEvents
Description	This query identifies any Domain indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in DeviceNetworkEvents.
Severity	Medium
Tactics	Impact
Required data connectors	MicrosoftDefenderThreatIntelligence MicrosoftThreatProtection ThreatIntelligence ThreatIntelligenceTaxii
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_DeviceNetworkEvents.yaml
Version	1.0.0
Arm template	c308b2f3-eebe-4a20-905c-cb8293b062db.json

KQL

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let DeviceNetworkEvents_ = DeviceNetworkEvents
  | where isnotempty(RemoteUrl)
  | where TimeGenerated >= ago(dt_lookBack)
  | where ActionType !has "ConnectionFailed"
  | extend Domain = tostring(parse_url(tolower(RemoteUrl)).Host)
  | where isnotempty(Domain)
  | project-rename DeviceNetworkEvents_TimeGenerated = TimeGenerated;
let DeviceNetworkEventDomains = DeviceNetworkEvents_
  | distinct Domain
  | summarize make_list(Domain);
ThreatIntelligenceIndicator
| where isnotempty(DomainName)
| where TimeGenerated >= ago(ioc_lookBack)
| extend TI_Domain = tolower(DomainName)
| where TI_Domain in (DeviceNetworkEventDomains)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
| join kind=innerunique (DeviceNetworkEvents_) on $left.TI_Domain == $right.Domain
| where DeviceNetworkEvents_TimeGenerated < ExpirationDateTime
| summarize DeviceNetworkEvents_TimeGenerated = arg_max(DeviceNetworkEvents_TimeGenerated, *) by IndicatorId, TI_Domain
| project DeviceNetworkEvents_TimeGenerated, IndicatorId, TI_Domain, Url = RemoteUrl, ConfidenceScore, Description, ThreatType, Tags, TrafficLightProtocolLevel, ActionType, DeviceId, DeviceName, InitiatingProcessAccountUpn, InitiatingProcessCommandLine, RemoteIP, RemotePort
| extend Name = tostring(split(InitiatingProcessAccountUpn, '@', 0)[0]), UPNSuffix = tostring(split(InitiatingProcessAccountUpn, '@', 1)[0])
| extend timestamp = DeviceNetworkEvents_TimeGenerated, UserPrincipalName = InitiatingProcessAccountUpn

YAML

severity: Medium
queryFrequency: 1h
kind: Scheduled
version: 1.0.0
triggerOperator: gt
description: |
    'This query identifies any Domain indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in DeviceNetworkEvents.'
queryPeriod: 14d
id: c308b2f3-eebe-4a20-905c-cb8293b062db
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: Host
  fieldMappings:
  - columnName: DeviceName
    identifier: FullName
- entityType: URL
  fieldMappings:
  - columnName: Url
    identifier: Url
- entityType: Process
  fieldMappings:
  - columnName: InitiatingProcessCommandLine
    identifier: CommandLine
tactics:
- Impact
name: TI Map Domain Entity to DeviceNetworkEvents
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_DeviceNetworkEvents.yaml
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let DeviceNetworkEvents_ = DeviceNetworkEvents
    | where isnotempty(RemoteUrl)
    | where TimeGenerated >= ago(dt_lookBack)
    | where ActionType !has "ConnectionFailed"
    | extend Domain = tostring(parse_url(tolower(RemoteUrl)).Host)
    | where isnotempty(Domain)
    | project-rename DeviceNetworkEvents_TimeGenerated = TimeGenerated;
  let DeviceNetworkEventDomains = DeviceNetworkEvents_
    | distinct Domain
    | summarize make_list(Domain);
  ThreatIntelligenceIndicator
  | where isnotempty(DomainName)
  | where TimeGenerated >= ago(ioc_lookBack)
  | extend TI_Domain = tolower(DomainName)
  | where TI_Domain in (DeviceNetworkEventDomains)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now()
  | where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
  | join kind=innerunique (DeviceNetworkEvents_) on $left.TI_Domain == $right.Domain
  | where DeviceNetworkEvents_TimeGenerated < ExpirationDateTime
  | summarize DeviceNetworkEvents_TimeGenerated = arg_max(DeviceNetworkEvents_TimeGenerated, *) by IndicatorId, TI_Domain
  | project DeviceNetworkEvents_TimeGenerated, IndicatorId, TI_Domain, Url = RemoteUrl, ConfidenceScore, Description, ThreatType, Tags, TrafficLightProtocolLevel, ActionType, DeviceId, DeviceName, InitiatingProcessAccountUpn, InitiatingProcessCommandLine, RemoteIP, RemotePort
  | extend Name = tostring(split(InitiatingProcessAccountUpn, '@', 0)[0]), UPNSuffix = tostring(split(InitiatingProcessAccountUpn, '@', 1)[0])
  | extend timestamp = DeviceNetworkEvents_TimeGenerated, UserPrincipalName = InitiatingProcessAccountUpn  
requiredDataConnectors:
- dataTypes:
  - DeviceNetworkEvents
  connectorId: MicrosoftThreatProtection
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/c308b2f3-eebe-4a20-905c-cb8293b062db')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/c308b2f3-eebe-4a20-905c-cb8293b062db')]",
      "properties": {
        "alertRuleTemplateName": "c308b2f3-eebe-4a20-905c-cb8293b062db",
        "customDetails": null,
        "description": "'This query identifies any Domain indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in DeviceNetworkEvents.'\n",
        "displayName": "TI Map Domain Entity to DeviceNetworkEvents",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "InitiatingProcessCommandLine",
                "identifier": "CommandLine"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_DeviceNetworkEvents.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet DeviceNetworkEvents_ = DeviceNetworkEvents\n  | where isnotempty(RemoteUrl)\n  | where TimeGenerated >= ago(dt_lookBack)\n  | where ActionType !has \"ConnectionFailed\"\n  | extend Domain = tostring(parse_url(tolower(RemoteUrl)).Host)\n  | where isnotempty(Domain)\n  | project-rename DeviceNetworkEvents_TimeGenerated = TimeGenerated;\nlet DeviceNetworkEventDomains = DeviceNetworkEvents_\n  | distinct Domain\n  | summarize make_list(Domain);\nThreatIntelligenceIndicator\n| where isnotempty(DomainName)\n| where TimeGenerated >= ago(ioc_lookBack)\n| extend TI_Domain = tolower(DomainName)\n| where TI_Domain in (DeviceNetworkEventDomains)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where Active == true and ExpirationDateTime > now()\n| where Description !contains_cs \"State: inactive;\" and Description !contains_cs \"State: falsepos;\"\n| join kind=innerunique (DeviceNetworkEvents_) on $left.TI_Domain == $right.Domain\n| where DeviceNetworkEvents_TimeGenerated < ExpirationDateTime\n| summarize DeviceNetworkEvents_TimeGenerated = arg_max(DeviceNetworkEvents_TimeGenerated, *) by IndicatorId, TI_Domain\n| project DeviceNetworkEvents_TimeGenerated, IndicatorId, TI_Domain, Url = RemoteUrl, ConfidenceScore, Description, ThreatType, Tags, TrafficLightProtocolLevel, ActionType, DeviceId, DeviceName, InitiatingProcessAccountUpn, InitiatingProcessCommandLine, RemoteIP, RemotePort\n| extend Name = tostring(split(InitiatingProcessAccountUpn, '@', 0)[0]), UPNSuffix = tostring(split(InitiatingProcessAccountUpn, '@', 1)[0])\n| extend timestamp = DeviceNetworkEvents_TimeGenerated, UserPrincipalName = InitiatingProcessAccountUpn\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}