UniFi Site Manager Console group membership churn

Unifi_SiteManager_Hosts_CL
| where TimeGenerated > ago(30d)
| mv-expand member = UserData.consoleGroupMembers
| summarize MembersByDay = make_set(tostring(member.mac)) by bin(TimeGenerated, 1d), Id, HostName = tostring(ReportedState.name)
| extend MemberCount = array_length(MembersByDay)
| order by Id, TimeGenerated asc
| extend Prev = prev(MembersByDay), PrevId = prev(Id)
| where Id == PrevId and array_length(set_difference(MembersByDay, coalesce(Prev, dynamic([])))) > 0
| project Date=TimeGenerated, HostName, ['New members'] = set_difference(MembersByDay, coalesce(Prev, dynamic([]))), MemberCount

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/UniFi%20Site%20Manager%20%28CCF%29/Hunting%20Queries/UniFiCloudConsoleGroupChurn.yaml
name: 'UniFi Site Manager: Console group membership churn'
version: 1.0.0
id: 8e22eb19-51df-37f7-468f-9d112fff9098
kind: HuntingQuery
query: |
  Unifi_SiteManager_Hosts_CL
  | where TimeGenerated > ago(30d)
  | mv-expand member = UserData.consoleGroupMembers
  | summarize MembersByDay = make_set(tostring(member.mac)) by bin(TimeGenerated, 1d), Id, HostName = tostring(ReportedState.name)
  | extend MemberCount = array_length(MembersByDay)
  | order by Id, TimeGenerated asc
  | extend Prev = prev(MembersByDay), PrevId = prev(Id)
  | where Id == PrevId and array_length(set_difference(MembersByDay, coalesce(Prev, dynamic([])))) > 0
  | project Date=TimeGenerated, HostName, ['New members'] = set_difference(MembersByDay, coalesce(Prev, dynamic([]))), MemberCount
relevantTechniques:
- T1098
requiredDataConnectors:
- dataTypes:
  - Unifi_SiteManager_Hosts_CL
  connectorId: UniFiSiteManagerConnectorDefinition
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: HostName
    identifier: HostName
description: |
  Tracks members of `userData.consoleGroupMembers` over time. Additions indicate new admin access; removals indicate revoked access. Both warrant review - additions are an account-creation signal, removals can be a sign of attacker cleanup.
tactics:
- Persistence

{
  "$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/8e22eb19-51df-37f7-468f-9d112fff9098')]",
      "kind": "Huntingquery",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/8e22eb19-51df-37f7-468f-9d112fff9098')]",
      "properties": {
        "alertRuleTemplateName": "8e22eb19-51df-37f7-468f-9d112fff9098",
        "customDetails": null,
        "description": "Tracks members of `userData.consoleGroupMembers` over time. Additions indicate new admin access; removals indicate revoked access. Both warrant review - additions are an account-creation signal, removals can be a sign of attacker cleanup.\n",
        "displayName": "UniFi Site Manager: Console group membership churn",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostName",
                "identifier": "HostName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/UniFi%20Site%20Manager%20%28CCF%29/Hunting%20Queries/UniFiCloudConsoleGroupChurn.yaml",
        "query": "Unifi_SiteManager_Hosts_CL\n| where TimeGenerated > ago(30d)\n| mv-expand member = UserData.consoleGroupMembers\n| summarize MembersByDay = make_set(tostring(member.mac)) by bin(TimeGenerated, 1d), Id, HostName = tostring(ReportedState.name)\n| extend MemberCount = array_length(MembersByDay)\n| order by Id, TimeGenerated asc\n| extend Prev = prev(MembersByDay), PrevId = prev(Id)\n| where Id == PrevId and array_length(set_difference(MembersByDay, coalesce(Prev, dynamic([])))) > 0\n| project Date=TimeGenerated, HostName, ['New members'] = set_difference(MembersByDay, coalesce(Prev, dynamic([]))), MemberCount\n",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1098"
        ],
        "templateVersion": "1.0.0"
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}