Dataverse - New user agent type that was not used with Office 365

let query_lookback = 14d;
let query_frequency = 1h;
let known_useragents = dynamic([
    // Enter known user agents to exclude.
    // example:
    // "Agent1", "Agent2", "Agent3"
    ]);
DataverseActivity
| where TimeGenerated > ago(query_frequency)
| where not (UserId has_any ("@onmicrosoft.com", "@microsoft.com", "Unknown"))
| where isnotempty(UserAgent)
| where UserAgent !in~ (known_useragents)
| where UserAgent !hasprefix "azure-logic-apps" and UserAgent !hasprefix "PowerApps"
| join kind = leftanti (
    OfficeActivity
    | where TimeGenerated between(ago(query_lookback) .. ago(query_frequency))
    | where isnotempty(UserAgent)
    | summarize by UserAgent)
    on UserAgent
// Exclude user agents with a render agent to reduce noise.
| join kind = leftanti(
    DataverseActivity
    | where TimeGenerated > ago(query_frequency)
    | where UserAgent has_any ("Gecko", "WebKit", "Presto", "Trident", "EdgeHTML", "Blink"))
    on UserAgent
| summarize
    FirstSeen = min(TimeGenerated),
    LatestIP = arg_max(ClientIp, TimeGenerated)
    by UserAgent, UserId, InstanceUrl
| extend
    AccountName = tostring(split(UserId, '@')[0]),
    UPNSuffix = tostring(split(UserId, '@')[1]),
    CloudAppId = int(32780)
| project
    FirstSeen,
    UserId,
    UserAgent,
    LatestIP,
    InstanceUrl,
    CloudAppId,
    AccountName,
    UPNSuffix

status: Available
triggerThreshold: 0
queryFrequency: 1h
id: 094b3c0a-1f63-42f7-9535-c8c7b7198328
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - New user agent type that was not used with Office 365.yaml
severity: Low
entityMappings:
- entityType: CloudApplication
  fieldMappings:
  - columnName: CloudAppId
    identifier: AppId
- entityType: Account
  fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: IP
  fieldMappings:
  - columnName: LatestIP
    identifier: Address
relevantTechniques:
- T1190
- T1133
requiredDataConnectors:
- connectorId: Dataverse
  dataTypes:
  - DataverseActivity
eventGroupingSettings:
  aggregationKind: AlertPerResult
name: Dataverse - New user agent type that was not used with Office 365
query: |
  let query_lookback = 14d;
  let query_frequency = 1h;
  let known_useragents = dynamic([
      // Enter known user agents to exclude.
      // example:
      // "Agent1", "Agent2", "Agent3"
      ]);
  DataverseActivity
  | where TimeGenerated > ago(query_frequency)
  | where not (UserId has_any ("@onmicrosoft.com", "@microsoft.com", "Unknown"))
  | where isnotempty(UserAgent)
  | where UserAgent !in~ (known_useragents)
  | where UserAgent !hasprefix "azure-logic-apps" and UserAgent !hasprefix "PowerApps"
  | join kind = leftanti (
      OfficeActivity
      | where TimeGenerated between(ago(query_lookback) .. ago(query_frequency))
      | where isnotempty(UserAgent)
      | summarize by UserAgent)
      on UserAgent
  // Exclude user agents with a render agent to reduce noise.
  | join kind = leftanti(
      DataverseActivity
      | where TimeGenerated > ago(query_frequency)
      | where UserAgent has_any ("Gecko", "WebKit", "Presto", "Trident", "EdgeHTML", "Blink"))
      on UserAgent
  | summarize
      FirstSeen = min(TimeGenerated),
      LatestIP = arg_max(ClientIp, TimeGenerated)
      by UserAgent, UserId, InstanceUrl
  | extend
      AccountName = tostring(split(UserId, '@')[0]),
      UPNSuffix = tostring(split(UserId, '@')[1]),
      CloudAppId = int(32780)
  | project
      FirstSeen,
      UserId,
      UserAgent,
      LatestIP,
      InstanceUrl,
      CloudAppId,
      AccountName,
      UPNSuffix  
queryPeriod: 14d
tactics:
- InitialAccess
triggerOperator: gt
kind: Scheduled
version: 3.2.0
description: Identifies users accessing Dynamics with a User Agent that has not been seen in any Office 365 workloads in the last 14 days.

{
  "$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/094b3c0a-1f63-42f7-9535-c8c7b7198328')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/094b3c0a-1f63-42f7-9535-c8c7b7198328')]",
      "properties": {
        "alertRuleTemplateName": "094b3c0a-1f63-42f7-9535-c8c7b7198328",
        "customDetails": null,
        "description": "Identifies users accessing Dynamics with a User Agent that has not been seen in any Office 365 workloads in the last 14 days.",
        "displayName": "Dataverse - New user agent type that was not used with Office 365",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "CloudAppId",
                "identifier": "AppId"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "LatestIP",
                "identifier": "Address"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - New user agent type that was not used with Office 365.yaml",
        "query": "let query_lookback = 14d;\nlet query_frequency = 1h;\nlet known_useragents = dynamic([\n    // Enter known user agents to exclude.\n    // example:\n    // \"Agent1\", \"Agent2\", \"Agent3\"\n    ]);\nDataverseActivity\n| where TimeGenerated > ago(query_frequency)\n| where not (UserId has_any (\"@onmicrosoft.com\", \"@microsoft.com\", \"Unknown\"))\n| where isnotempty(UserAgent)\n| where UserAgent !in~ (known_useragents)\n| where UserAgent !hasprefix \"azure-logic-apps\" and UserAgent !hasprefix \"PowerApps\"\n| join kind = leftanti (\n    OfficeActivity\n    | where TimeGenerated between(ago(query_lookback) .. ago(query_frequency))\n    | where isnotempty(UserAgent)\n    | summarize by UserAgent)\n    on UserAgent\n// Exclude user agents with a render agent to reduce noise.\n| join kind = leftanti(\n    DataverseActivity\n    | where TimeGenerated > ago(query_frequency)\n    | where UserAgent has_any (\"Gecko\", \"WebKit\", \"Presto\", \"Trident\", \"EdgeHTML\", \"Blink\"))\n    on UserAgent\n| summarize\n    FirstSeen = min(TimeGenerated),\n    LatestIP = arg_max(ClientIp, TimeGenerated)\n    by UserAgent, UserId, InstanceUrl\n| extend\n    AccountName = tostring(split(UserId, '@')[0]),\n    UPNSuffix = tostring(split(UserId, '@')[1]),\n    CloudAppId = int(32780)\n| project\n    FirstSeen,\n    UserId,\n    UserAgent,\n    LatestIP,\n    InstanceUrl,\n    CloudAppId,\n    AccountName,\n    UPNSuffix\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "3.2.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}