Detection rules › Sigma
User State Changed From Guest To Member
Detects the change of user type from "Guest" to "Member" for potential elevation of privilege.
Known false positives
- If this was approved by System Administrator.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | |
| Persistence | |
| Privilege Escalation | |
| Stealth |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| Azure | Update user |
Rules detecting the same action
These rules filter on the same operation.
- [Entra ID] Authentication Method Changed for Privileged Account (Kusto)
- Account Created and Deleted in Short Timeframe (Kusto)
- Account Created And Deleted Within A Close Time Frame (Sigma)
- Account created from non-approved sources (Kusto)
- Account created or deleted by non-approved user (Kusto)
- Addition of a Temporary Access Pass to a Privileged Account (Kusto)
- Authentication Method Changed for Privileged Account (Kusto)
- Authentication Methods Changed for Privileged Account (Kusto)
Rule body
title: User State Changed From Guest To Member
id: 8dee7a0d-43fd-4b3c-8cd1-605e189d195e
status: test
description: Detects the change of user type from "Guest" to "Member" for potential elevation of privilege.
references:
- https://learn.microsoft.com/en-gb/entra/architecture/security-operations-user-accounts#monitoring-external-user-sign-ins
author: MikeDuddington, '@dudders1'
date: 2022-06-30
tags:
- attack.persistence
- attack.privilege-escalation
- attack.initial-access
- attack.stealth
- attack.t1078.004
logsource:
product: azure
service: auditlogs
detection:
selection:
Category: 'UserManagement'
OperationName: 'Update user'
properties.message: '"displayName":"UserType","oldValue":"[\"Guest\"]","newValue":"[\"Member\"]"'
condition: selection
falsepositives:
- If this was approved by System Administrator.
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Category: 'UserManagement'
OperationName: 'Update user'
properties.message: '"displayName":"UserType","oldValue":"[\"Guest\"]","newValue":"[\"Member\"]"'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
Category | eq |
| field:"Category" kind:eq value:"UserManagement" |
OperationName | eq |
| field:"OperationName" kind:eq value:"Update user" |
properties.message | eq |
| field:"properties.message" kind:eq |