Microsoft Sentinel Analytic Rules
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ThreatConnect TI Map URL Entity to OfficeActivity Data

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Id12c3b31b-66a6-53ff-b6ab-6ae45e56dc92
RulenameThreatConnect TI Map URL Entity to OfficeActivity Data
DescriptionThis query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in OfficeActivity data.
SeverityMedium
TacticsImpact
Required data connectorsMicrosoftDefenderThreatIntelligence
Office365
ThreatIntelligence
KindScheduled
Query frequency1h
Query period14d
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ThreatConnect/Analytic Rules/ThreatConnect_URLEntity_OfficeActivity.yaml
Version1.0.0
Arm template12c3b31b-66a6-53ff-b6ab-6ae45e56dc92.json
Deploy To Azure
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
  ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where ExpirationDateTime > now() and Active == true
// Filter out non ThreatConnect TI Sources
| where SourceSystem startswith "ThreatConnect-"
// Picking up only IOC's that contain the entities we want
| where isnotempty(Url)
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
  OfficeActivity
  | where TimeGenerated >= ago(dt_lookBack)
  //Extract the Url from a number of potential fields
  | extend Url = iif(OfficeWorkload == "AzureActiveDirectory",extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);", 1,ModifiedProperties),tostring(parse_json(ModifiedProperties)[12].NewValue))
  | where isnotempty(Url)
  // Ensure we get a clean URL
  | extend Url = tostring(split(Url, ';')[0])
  | extend OfficeActivity_TimeGenerated = TimeGenerated
  // Project a single user identity that we can use for entity mapping
  | extend User = iif(isnotempty(UserId), UserId, iif(isnotempty(Actor), tostring(parse_json(Actor)[0].ID), tostring(parse_json(Parameters)[0].Value)))
) on Url
| where OfficeActivity_TimeGenerated < ExpirationDateTime
| summarize OfficeActivity_TimeGenerated = arg_max(OfficeActivity_TimeGenerated, *) by IndicatorId, Url
| project OfficeActivity_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Operation,
UserType, OfficeWorkload, Parameters, Url, User
| extend timestamp = OfficeActivity_TimeGenerated, Name = tostring(split(User, '@', 0)[0]), UPNSuffix = tostring(split(User, '@', 1)[0])
name: ThreatConnect TI Map URL Entity to OfficeActivity Data
id: 12c3b31b-66a6-53ff-b6ab-6ae45e56dc92
triggerThreshold: 0
severity: Medium
requiredDataConnectors:
- dataTypes:
  - OfficeActivity
  connectorId: Office365
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ThreatConnect/Analytic Rules/ThreatConnect_URLEntity_OfficeActivity.yaml
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: URL
  fieldMappings:
  - columnName: Url
    identifier: Url
kind: Scheduled
queryFrequency: 1h
triggerOperator: gt
description: |
    'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in OfficeActivity data.'
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
    ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where ExpirationDateTime > now() and Active == true
  // Filter out non ThreatConnect TI Sources
  | where SourceSystem startswith "ThreatConnect-"
  // Picking up only IOC's that contain the entities we want
  | where isnotempty(Url)
  // using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
  | join kind=innerunique (
    OfficeActivity
    | where TimeGenerated >= ago(dt_lookBack)
    //Extract the Url from a number of potential fields
    | extend Url = iif(OfficeWorkload == "AzureActiveDirectory",extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);", 1,ModifiedProperties),tostring(parse_json(ModifiedProperties)[12].NewValue))
    | where isnotempty(Url)
    // Ensure we get a clean URL
    | extend Url = tostring(split(Url, ';')[0])
    | extend OfficeActivity_TimeGenerated = TimeGenerated
    // Project a single user identity that we can use for entity mapping
    | extend User = iif(isnotempty(UserId), UserId, iif(isnotempty(Actor), tostring(parse_json(Actor)[0].ID), tostring(parse_json(Parameters)[0].Value)))
  ) on Url
  | where OfficeActivity_TimeGenerated < ExpirationDateTime
  | summarize OfficeActivity_TimeGenerated = arg_max(OfficeActivity_TimeGenerated, *) by IndicatorId, Url
  | project OfficeActivity_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Operation,
  UserType, OfficeWorkload, Parameters, Url, User
  | extend timestamp = OfficeActivity_TimeGenerated, Name = tostring(split(User, '@', 0)[0]), UPNSuffix = tostring(split(User, '@', 1)[0])  
tactics:
- Impact
version: 1.0.0
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": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/12c3b31b-66a6-53ff-b6ab-6ae45e56dc92')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/12c3b31b-66a6-53ff-b6ab-6ae45e56dc92')]",
      "properties": {
        "alertRuleTemplateName": "12c3b31b-66a6-53ff-b6ab-6ae45e56dc92",
        "customDetails": null,
        "description": "'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in OfficeActivity data.'\n",
        "displayName": "ThreatConnect TI Map URL Entity to OfficeActivity Data",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ThreatConnect/Analytic Rules/ThreatConnect_URLEntity_OfficeActivity.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\n  ThreatIntelligenceIndicator\n  | where TimeGenerated >= ago(ioc_lookBack)\n  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n  | where ExpirationDateTime > now() and Active == true\n// Filter out non ThreatConnect TI Sources\n| where SourceSystem startswith \"ThreatConnect-\"\n// Picking up only IOC's that contain the entities we want\n| where isnotempty(Url)\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique (\n  OfficeActivity\n  | where TimeGenerated >= ago(dt_lookBack)\n  //Extract the Url from a number of potential fields\n  | extend Url = iif(OfficeWorkload == \"AzureActiveDirectory\",extract(\"(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\\\(\\\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);\", 1,ModifiedProperties),tostring(parse_json(ModifiedProperties)[12].NewValue))\n  | where isnotempty(Url)\n  // Ensure we get a clean URL\n  | extend Url = tostring(split(Url, ';')[0])\n  | extend OfficeActivity_TimeGenerated = TimeGenerated\n  // Project a single user identity that we can use for entity mapping\n  | extend User = iif(isnotempty(UserId), UserId, iif(isnotempty(Actor), tostring(parse_json(Actor)[0].ID), tostring(parse_json(Parameters)[0].Value)))\n) on Url\n| where OfficeActivity_TimeGenerated < ExpirationDateTime\n| summarize OfficeActivity_TimeGenerated = arg_max(OfficeActivity_TimeGenerated, *) by IndicatorId, Url\n| project OfficeActivity_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Operation,\nUserType, OfficeWorkload, Parameters, Url, User\n| extend timestamp = OfficeActivity_TimeGenerated, Name = tostring(split(User, '@', 0)[0]), UPNSuffix = tostring(split(User, '@', 1)[0])\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"
    }
  ]
}