External User Access Enabled

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Id	8e267e91-6bda-4b3c-bf68-9f5cbdd103a3
Rulename	External User Access Enabled
Description	This alerts when the account setting is changed to allow either external domain access or anonymous access to meetings.
Severity	Low
Tactics	CredentialAccess Persistence
Techniques	T1098 T1556
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ZoomLogs/ExternalUserAccess.yaml
Version	1.0.3
Arm template	8e267e91-6bda-4b3c-bf68-9f5cbdd103a3.json

KQL

ZoomLogs
| where Event =~ "account.settings_updated"
| extend EnforceLogin = columnifexists("payload_object_settings_schedule_meeting_enfore_login_b", "")
| extend EnforceLoginDomain = columnifexists("payload_object_settings_schedule_meeting_enfore_login_b", "")
| extend GuestAlerts = columnifexists("payload_object_settings_in_meeting_alert_guest_join_b", "")
| where EnforceLogin == 'false' or EnforceLoginDomain == 'false' or GuestAlerts == 'false'
| extend SettingChanged = case(EnforceLogin == 'false' and EnforceLoginDomain == 'false' and GuestAlerts == 'false', "All settings changed",
                            EnforceLogin == 'false' and EnforceLoginDomain == 'false', "Enforced Logons and Restricted Domains Changed",
                            EnforceLoginDomain == 'false' and GuestAlerts == 'false', "Enforced Domains Changed",
                            EnforceLoginDomain == 'false', "Enfored Domains Changed",
                            GuestAlerts == 'false', "Guest Join Alerts Changed",
                            EnforceLogin == 'false', "Enforced Logins Changed",
                            "No Changes")
| extend timestamp = TimeGenerated, AccountCustomEntity = User

YAML

version: 1.0.3
queryFrequency: 1d
requiredDataConnectors: []
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
kind: Scheduled
queryPeriod: 1d
severity: Low
query: |
  ZoomLogs
  | where Event =~ "account.settings_updated"
  | extend EnforceLogin = columnifexists("payload_object_settings_schedule_meeting_enfore_login_b", "")
  | extend EnforceLoginDomain = columnifexists("payload_object_settings_schedule_meeting_enfore_login_b", "")
  | extend GuestAlerts = columnifexists("payload_object_settings_in_meeting_alert_guest_join_b", "")
  | where EnforceLogin == 'false' or EnforceLoginDomain == 'false' or GuestAlerts == 'false'
  | extend SettingChanged = case(EnforceLogin == 'false' and EnforceLoginDomain == 'false' and GuestAlerts == 'false', "All settings changed",
                              EnforceLogin == 'false' and EnforceLoginDomain == 'false', "Enforced Logons and Restricted Domains Changed",
                              EnforceLoginDomain == 'false' and GuestAlerts == 'false', "Enforced Domains Changed",
                              EnforceLoginDomain == 'false', "Enfored Domains Changed",
                              GuestAlerts == 'false', "Guest Join Alerts Changed",
                              EnforceLogin == 'false', "Enforced Logins Changed",
                              "No Changes")
  | extend timestamp = TimeGenerated, AccountCustomEntity = User  
metadata:
  categories:
    domains:
    - Security - Others
    - Identity
  author:
    name: Pete Bryan
  support:
    tier: Community
  source:
    kind: Community
triggerOperator: gt
id: 8e267e91-6bda-4b3c-bf68-9f5cbdd103a3
description: |
    'This alerts when the account setting is changed to allow either external domain access or anonymous access to meetings.'
triggerThreshold: 0
name: External User Access Enabled
relevantTechniques:
- T1098
- T1556
tactics:
- CredentialAccess
- Persistence
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ZoomLogs/ExternalUserAccess.yaml

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/8e267e91-6bda-4b3c-bf68-9f5cbdd103a3')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/8e267e91-6bda-4b3c-bf68-9f5cbdd103a3')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "External User Access Enabled",
        "description": "'This alerts when the account setting is changed to allow either external domain access or anonymous access to meetings.'\n",
        "severity": "Low",
        "enabled": true,
        "query": "ZoomLogs\n| where Event =~ \"account.settings_updated\"\n| extend EnforceLogin = columnifexists(\"payload_object_settings_schedule_meeting_enfore_login_b\", \"\")\n| extend EnforceLoginDomain = columnifexists(\"payload_object_settings_schedule_meeting_enfore_login_b\", \"\")\n| extend GuestAlerts = columnifexists(\"payload_object_settings_in_meeting_alert_guest_join_b\", \"\")\n| where EnforceLogin == 'false' or EnforceLoginDomain == 'false' or GuestAlerts == 'false'\n| extend SettingChanged = case(EnforceLogin == 'false' and EnforceLoginDomain == 'false' and GuestAlerts == 'false', \"All settings changed\",\n                            EnforceLogin == 'false' and EnforceLoginDomain == 'false', \"Enforced Logons and Restricted Domains Changed\",\n                            EnforceLoginDomain == 'false' and GuestAlerts == 'false', \"Enforced Domains Changed\",\n                            EnforceLoginDomain == 'false', \"Enfored Domains Changed\",\n                            GuestAlerts == 'false', \"Guest Join Alerts Changed\",\n                            EnforceLogin == 'false', \"Enforced Logins Changed\",\n                            \"No Changes\")\n| extend timestamp = TimeGenerated, AccountCustomEntity = User\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "Persistence"
        ],
        "techniques": [
          "T1098",
          "T1556"
        ],
        "alertRuleTemplateName": "8e267e91-6bda-4b3c-bf68-9f5cbdd103a3",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ZoomLogs/ExternalUserAccess.yaml",
        "templateVersion": "1.0.3"
      }
    }
  ]
}