TI Map URL Entity to DeviceNetworkEvents

Back


Id	4f0356b2-d344-4c19-9375-31b9575d80cb
Rulename	TI Map URL Entity to DeviceNetworkEvents
Description	This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in DeviceNetworkEvents.
Severity	Medium
Tactics	CommandAndControl
Techniques	T1071
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 (NEW)/Analytic Rules/URLEntity_DeviceNetworkEvents_Updated.yaml
Version	1.0.5
Arm template	4f0356b2-d344-4c19-9375-31b9575d80cb.json

KQL

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let DeviceNetworkEvents_ = DeviceNetworkEvents
  | where TimeGenerated >= ago(dt_lookBack)
  | where ActionType !has "ConnectionFailed"
  | project-rename DeviceNetworkEvents_TimeGenerated = TimeGenerated;
let DeviceNetworkEventUrls = DeviceNetworkEvents_
  | distinct Url = RemoteUrl
  | summarize make_list(Url);
ThreatIntelIndicators
//extract key part of kv pair
| extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
| where IndicatorType == "url"
| extend Url = ObservableValue
| extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
| where TimeGenerated >= ago(ioc_lookBack)
| extend Url = tolower(Url)
| where Url in (DeviceNetworkEventUrls)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
| where IsActive and (ValidUntil > now() or isempty(ValidUntil))
| extend Description = tostring(parse_json(Data).description)
| where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
   | project-reorder *, Tags, TrafficLightProtocolLevel, Url, Type
| join kind=innerunique (DeviceNetworkEvents_) on $left.Url == $right.RemoteUrl
| where DeviceNetworkEvents_TimeGenerated < ValidUntil
| summarize DeviceNetworkEvents_TimeGenerated = arg_max(DeviceNetworkEvents_TimeGenerated, *) by Id, Url
| extend Description = tostring(parse_json(Data).description)
| extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
| project DeviceNetworkEvents_TimeGenerated, Id, Url, Confidence, Description, Type, 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

kind: Scheduled
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
description: |
    'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in DeviceNetworkEvents.'
severity: Medium
queryFrequency: 1h
triggerThreshold: 0
relevantTechniques:
- T1071
tactics:
- CommandAndControl
name: TI Map URL Entity to DeviceNetworkEvents
id: 4f0356b2-d344-4c19-9375-31b9575d80cb
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let DeviceNetworkEvents_ = DeviceNetworkEvents
    | where TimeGenerated >= ago(dt_lookBack)
    | where ActionType !has "ConnectionFailed"
    | project-rename DeviceNetworkEvents_TimeGenerated = TimeGenerated;
  let DeviceNetworkEventUrls = DeviceNetworkEvents_
    | distinct Url = RemoteUrl
    | summarize make_list(Url);
  ThreatIntelIndicators
  //extract key part of kv pair
  | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
  | where IndicatorType == "url"
  | extend Url = ObservableValue
  | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
  | where TimeGenerated >= ago(ioc_lookBack)
  | extend Url = tolower(Url)
  | where Url in (DeviceNetworkEventUrls)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
  | where IsActive and (ValidUntil > now() or isempty(ValidUntil))
  | extend Description = tostring(parse_json(Data).description)
  | where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
     | project-reorder *, Tags, TrafficLightProtocolLevel, Url, Type
  | join kind=innerunique (DeviceNetworkEvents_) on $left.Url == $right.RemoteUrl
  | where DeviceNetworkEvents_TimeGenerated < ValidUntil
  | summarize DeviceNetworkEvents_TimeGenerated = arg_max(DeviceNetworkEvents_TimeGenerated, *) by Id, Url
  | extend Description = tostring(parse_json(Data).description)
  | extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
  | project DeviceNetworkEvents_TimeGenerated, Id, Url, Confidence, Description, Type, 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:
  - ThreatIntelIndicators
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelIndicators
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelIndicators
  connectorId: MicrosoftDefenderThreatIntelligence
version: 1.0.5
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/URLEntity_DeviceNetworkEvents_Updated.yaml
queryPeriod: 14d

ARM

{
  "$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/4f0356b2-d344-4c19-9375-31b9575d80cb')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4f0356b2-d344-4c19-9375-31b9575d80cb')]",
      "properties": {
        "alertRuleTemplateName": "4f0356b2-d344-4c19-9375-31b9575d80cb",
        "customDetails": null,
        "description": "'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in DeviceNetworkEvents.'\n",
        "displayName": "TI Map URL 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 (NEW)/Analytic Rules/URLEntity_DeviceNetworkEvents_Updated.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet DeviceNetworkEvents_ = DeviceNetworkEvents\n  | where TimeGenerated >= ago(dt_lookBack)\n  | where ActionType !has \"ConnectionFailed\"\n  | project-rename DeviceNetworkEvents_TimeGenerated = TimeGenerated;\nlet DeviceNetworkEventUrls = DeviceNetworkEvents_\n  | distinct Url = RemoteUrl\n  | summarize make_list(Url);\nThreatIntelIndicators\n//extract key part of kv pair\n| extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n| where IndicatorType == \"url\"\n| extend Url = ObservableValue\n| extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)\n| where TimeGenerated >= ago(ioc_lookBack)\n| extend Url = tolower(Url)\n| where Url in (DeviceNetworkEventUrls)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue\n| where IsActive and (ValidUntil > now() or isempty(ValidUntil))\n| extend Description = tostring(parse_json(Data).description)\n| where Description !contains_cs \"State: inactive;\" and Description !contains_cs \"State: falsepos;\"\n   | project-reorder *, Tags, TrafficLightProtocolLevel, Url, Type\n| join kind=innerunique (DeviceNetworkEvents_) on $left.Url == $right.RemoteUrl\n| where DeviceNetworkEvents_TimeGenerated < ValidUntil\n| summarize DeviceNetworkEvents_TimeGenerated = arg_max(DeviceNetworkEvents_TimeGenerated, *) by Id, Url\n| extend Description = tostring(parse_json(Data).description)\n| extend ActivityGroupNames = extract(@\"ActivityGroup:(\\S+)\", 1, tostring(parse_json(Data).labels))\n| project DeviceNetworkEvents_TimeGenerated, Id, Url, Confidence, Description, Type, 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",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.0.5",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}