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ExternalUserAccess.yaml
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ExternalUserAccess.yaml
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id: 8e267e91-6bda-4b3c-bf68-9f5cbdd103a3
name: 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
requiredDataConnectors: []
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
- CredentialAccess
- Persistence
relevantTechniques:
- T1098
- T1556
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 AccountName = tostring(split(User, "@")[0]), AccountUPNSuffix = tostring(split(User, "@")[1])
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: User
- identifier: Name
columnName: AccountName
- identifier: UPNSuffix
columnName: AccountUPNSuffix
version: 1.0.4
kind: Scheduled
metadata:
source:
kind: Community
author:
name: Microsoft Security Research
support:
tier: Community
categories:
domains: [ "Security - Others", "Identity" ]