Guest Users Invited To Tenant By Non Approved Inviters

calendar Oct 23, 2025 · attack.privilege-escalation attack.persistence attack.defense-evasion attack.initial-access attack.t1078  ·
Share on: linkedin copy

Detects guest users being invited to tenant by non-approved inviters

Sigma rule (View on GitHub)

 1title: Guest Users Invited To Tenant By Non Approved Inviters
 2id: 4ad97bf5-a514-41a4-abd3-4f3455ad4865
 3status: test
 4description: Detects guest users being invited to tenant by non-approved inviters
 5references:
 6    - https://learn.microsoft.com/en-gb/entra/architecture/security-operations-user-accounts#monitoring-external-user-sign-ins
 7author: MikeDuddington, '@dudders1'
 8date: 2022-07-28
 9tags:
10    - attack.privilege-escalation
11    - attack.persistence
12    - attack.defense-evasion
13    - attack.initial-access
14    - attack.t1078
15logsource:
16    product: azure
17    service: auditlogs
18detection:
19    selection:
20        Category: 'UserManagement'
21        OperationName: 'Invite external user'
22    filter:
23        InitiatedBy|contains: '<approved guest inviter use OR for multiple>'
24    condition: selection and not filter
25falsepositives:
26    - If this was approved by System Administrator.
27level: medium

References

Related rules

to-top