Dataverse - New user agent type that was not used before

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Id	34a5d79b-8f9a-420c-aa64-7f4d262ac29a
Rulename	Dataverse - New user agent type that was not used before
Description	Identifies users accessing Dataverse from a User Agent that has not been seen in any Dataverse instance in the last 14 days.
Severity	Low
Tactics	InitialAccess DefenseEvasion
Techniques	T1078 T0866 T0819 T1036
Required data connectors	Dataverse
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/Microsoft Business Applications/Analytic Rules/Dataverse - New user agent type that was not used before.yaml
Version	3.2.0
Arm template	34a5d79b-8f9a-420c-aa64-7f4d262ac29a.json

KQL

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 between(ago(query_lookback) .. ago(query_frequency))
| where isnotempty(UserAgent)
| summarize by UserAgent
| join kind = rightanti (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")
    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

YAML

kind: Scheduled
id: 34a5d79b-8f9a-420c-aa64-7f4d262ac29a
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: AppId
    columnName: CloudAppId
  - identifier: InstanceName
    columnName: InstanceUrl
  entityType: CloudApplication
- fieldMappings:
  - identifier: Address
    columnName: LatestIP
  entityType: IP
name: Dataverse - New user agent type that was not used before
severity: Low
triggerOperator: gt
tactics:
- InitialAccess
- DefenseEvasion
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 between(ago(query_lookback) .. ago(query_frequency))
  | where isnotempty(UserAgent)
  | summarize by UserAgent
  | join kind = rightanti (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")
      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  
triggerThreshold: 0
status: Available
description: Identifies users accessing Dataverse from a User Agent that has not been seen in any Dataverse instance in the last 14 days.
eventGroupingSettings:
  aggregationKind: AlertPerResult
queryFrequency: 1h
queryPeriod: 14d
relevantTechniques:
- T1078
- T0866
- T0819
- T1036
version: 3.2.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - New user agent type that was not used before.yaml
requiredDataConnectors:
- connectorId: Dataverse
  dataTypes:
  - DataverseActivity
alertDetailsOverride:
  alertDisplayNameFormat: 'Dataverse - new user agent detected in {{{InstanceUrl}} '
  alertDescriptionFormat: |
    {{UserId}} with new agent not seen previously in the Dataverse activity log.
    Agent: {{UserAgent}}
    Latest IP: {{LatestIP}}

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/34a5d79b-8f9a-420c-aa64-7f4d262ac29a')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/34a5d79b-8f9a-420c-aa64-7f4d262ac29a')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "{{UserId}} with new agent not seen previously in the Dataverse activity log.\nAgent: {{UserAgent}}\nLatest IP: {{LatestIP}}\n",
          "alertDisplayNameFormat": "Dataverse - new user agent detected in {{{InstanceUrl}} "
        },
        "alertRuleTemplateName": "34a5d79b-8f9a-420c-aa64-7f4d262ac29a",
        "customDetails": null,
        "description": "Identifies users accessing Dataverse from a User Agent that has not been seen in any Dataverse instance in the last 14 days.",
        "displayName": "Dataverse - New user agent type that was not used before",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "CloudAppId",
                "identifier": "AppId"
              },
              {
                "columnName": "InstanceUrl",
                "identifier": "InstanceName"
              }
            ]
          },
          {
            "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 before.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 between(ago(query_lookback) .. ago(query_frequency))\n| where isnotempty(UserAgent)\n| summarize by UserAgent\n| join kind = rightanti (DataverseActivity\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    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": [
          "DefenseEvasion",
          "InitialAccess"
        ],
        "techniques": [
          "T1036",
          "T1078"
        ],
        "templateVersion": "3.2.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}