ApexOne - Device access permissions was changed

let threshold = 1;
TMApexOneEvent
| where EventMessage has "Device access"
| extend DeviceCustomNumber3 = coalesce(
                                  column_ifexists("FieldDeviceCustomNumber3", long(null)),
                                  DeviceCustomNumber3,
                                  long(null)
                              )
| extend Permission = case(
                            DeviceCustomNumber3 == "0", "Modify", 
                            DeviceCustomNumber3 == "1", "Read and execute",
                            DeviceCustomNumber3 == "2", "Read",
                            DeviceCustomNumber3 == "3", "List device content only", 
                            DeviceCustomNumber3 == "4", "Block",
                            "unknown"
                      )
| summarize Permissions = make_set(Permission) by DstUserName
| extend PermissionCount = array_length(Permissions)
| where PermissionCount > threshold
| extend AccountCustomEntity = DstUserName

relevantTechniques:
- T1078
name: ApexOne - Device access permissions was changed
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: CefAma
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
  entityType: Account
triggerThreshold: 0
id: b463b952-67b8-11ec-90d6-0242ac120003
tactics:
- PrivilegeEscalation
version: 1.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Apex One/Analytic Rules/TMApexOneDvcAccessPermissionWasChanged.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'Query shows device access permissions was changed.'
query: |
  let threshold = 1;
  TMApexOneEvent
  | where EventMessage has "Device access"
  | extend DeviceCustomNumber3 = coalesce(
                                    column_ifexists("FieldDeviceCustomNumber3", long(null)),
                                    DeviceCustomNumber3,
                                    long(null)
                                )
  | extend Permission = case(
                              DeviceCustomNumber3 == "0", "Modify", 
                              DeviceCustomNumber3 == "1", "Read and execute",
                              DeviceCustomNumber3 == "2", "Read",
                              DeviceCustomNumber3 == "3", "List device content only", 
                              DeviceCustomNumber3 == "4", "Block",
                              "unknown"
                        )
  | summarize Permissions = make_set(Permission) by DstUserName
  | extend PermissionCount = array_length(Permissions)
  | where PermissionCount > threshold
  | extend AccountCustomEntity = DstUserName  
triggerOperator: gt

{
  "$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/b463b952-67b8-11ec-90d6-0242ac120003')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b463b952-67b8-11ec-90d6-0242ac120003')]",
      "properties": {
        "alertRuleTemplateName": "b463b952-67b8-11ec-90d6-0242ac120003",
        "customDetails": null,
        "description": "'Query shows device access permissions was changed.'\n",
        "displayName": "ApexOne - Device access permissions was changed",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Apex One/Analytic Rules/TMApexOneDvcAccessPermissionWasChanged.yaml",
        "query": "let threshold = 1;\nTMApexOneEvent\n| where EventMessage has \"Device access\"\n| extend DeviceCustomNumber3 = coalesce(\n                                  column_ifexists(\"FieldDeviceCustomNumber3\", long(null)),\n                                  DeviceCustomNumber3,\n                                  long(null)\n                              )\n| extend Permission = case(\n                            DeviceCustomNumber3 == \"0\", \"Modify\", \n                            DeviceCustomNumber3 == \"1\", \"Read and execute\",\n                            DeviceCustomNumber3 == \"2\", \"Read\",\n                            DeviceCustomNumber3 == \"3\", \"List device content only\", \n                            DeviceCustomNumber3 == \"4\", \"Block\",\n                            \"unknown\"\n                      )\n| summarize Permissions = make_set(Permission) by DstUserName\n| extend PermissionCount = array_length(Permissions)\n| where PermissionCount > threshold\n| extend AccountCustomEntity = DstUserName\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}