First Time Seen Google Workspace OAuth Login from Third-Party Application
editFirst Time Seen Google Workspace OAuth Login from Third-Party Application
editDetects the first time a third-party application logs in and authenticated with OAuth. OAuth is used to grant permissions to specific resources and services in Google Workspace. Compromised credentials or service accounts could allow an adversary to authenticate to Google Workspace as a valid user and inherit their privileges.
Rule type: new_terms
Rule indices:
- filebeat-*
- logs-google_workspace*
Severity: medium
Risk score: 47
Runs every: 10m
Searches indices from: now-130m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Cloud
- Data Source: Google Workspace
- Tactic: Defense Evasion
- Tactic: Initial Access
Version: 4
Rule authors:
- Elastic
Rule license: Elastic License v2
Investigation guide
editSetup
Important Information Regarding Google Workspace Event Lag Times
- As per Google’s documentation, Google Workspace administrators may observe lag times ranging from minutes up to 3 days between the time of an event’s occurrence and the event being visible in the Google Workspace admin/audit logs.
- This rule is configured to run every 10 minutes with a lookback time of 130 minutes.
- To reduce the risk of false negatives, consider reducing the interval that the Google Workspace (formerly G Suite) Filebeat module polls Google’s reporting API for new events.
-
By default,
var.intervalis set to 2 hours (2h). Consider changing this interval to a lower value, such as 10 minutes (10m). - See the following references for further information:
- https://support.google.com/a/answer/7061566
- https://www.elastic.co/guide/en/beats/filebeat/current/filebeat-module-google_workspace.html
Setup
editThe Google Workspace Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
Rule query
editevent.dataset: "google_workspace.token" and event.action: "authorize" and google_workspace.token.scope.data: *Login and google_workspace.token.client.id: *apps.googleusercontent.com
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Use Alternate Authentication Material
- ID: T1550
- Reference URL: https://attack.mitre.org/techniques/T1550/
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Sub-technique:
- Name: Application Access Token
- ID: T1550.001
- Reference URL: https://attack.mitre.org/techniques/T1550/001/
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Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
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Technique:
- Name: Valid Accounts
- ID: T1078
- Reference URL: https://attack.mitre.org/techniques/T1078/
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Sub-technique:
- Name: Cloud Accounts
- ID: T1078.004
- Reference URL: https://attack.mitre.org/techniques/T1078/004/