Guest Users Invited To Tenant By Non Approved Inviters

Title: Guest Users Invited To Tenant By Non Approved Inviters
Status: test
Description:Detects guest users being invited to tenant by non-approved inviters
References:
  -https://learn.microsoft.com/en-gb/entra/architecture/security-operations-user-accounts#monitoring-external-user-sign-ins
Author: MikeDuddington, '@dudders1'
Date: 2022-07-28
modified:None
Tags:

• -'attack.privilege-escalation'
• -'attack.persistence'
• -'attack.initial-access'
• -'attack.stealth'
• -'attack.t1078'

Logsource:

• product: azure
• service: auditlogs

Detection:
  selection:
    Category: 'UserManagement'
    OperationName: 'Invite external user'
  filter:
    InitiatedBy|contains: '<approved guest inviter use OR for multiple>'
  condition:selection and not filter
Falsepositives:
  -If this was approved by System Administrator.
Level: medium