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
eventGroupingSettings:
  aggregationKind: AlertPerResult
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}}    
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
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
queryFrequency: 1h
triggerThreshold: 0
relevantTechniques:
- T1078
- T0866
- T0819
- T1036
status: Available
tactics:
- InitialAccess
- DefenseEvasion
name: Dataverse - New user agent type that was not used before
id: 34a5d79b-8f9a-420c-aa64-7f4d262ac29a
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  
requiredDataConnectors:
- dataTypes:
  - DataverseActivity
  connectorId: Dataverse
version: 3.2.0
triggerOperator: gt
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
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/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"
    }
  ]
}