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GCP IAM Custom Role Creation

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GCP IAM Custom Role Creation

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Identifies an Identity and Access Management (IAM) custom role creation in Google Cloud Platform (GCP). Custom roles are user-defined, and allow for the bundling of one or more supported permissions to meet specific needs. Custom roles will not be updated automatically and could lead to privilege creep if not carefully scrutinized.

Rule type: query

Rule indices:

filebeat-*
logs-gcp*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://cloud.google.com/iam/docs/understanding-custom-roles

Tags:

Elastic
Cloud
GCP
Continuous Monitoring
SecOps
Identity and Access

Version: 102 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Custom role creations may be done by a system or network administrator. Verify whether the user email, resource name, and/or hostname should be making changes in your environment. Role creations by unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guide

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Rule query

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event.dataset:gcp.audit and
event.action:google.iam.admin.v*.CreateRole and event.outcome:success

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
Technique:
- Name: Valid Accounts
- ID: T1078
- Reference URL: https://attack.mitre.org/techniques/T1078/
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Valid Accounts
- ID: T1078
- Reference URL: https://attack.mitre.org/techniques/T1078/

Rule version history

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Version 102 (8.6.0 release)

Formatting only

Version 100 (8.5.0 release)

Formatting only

Version 8 (8.4.0 release)

Updated query, changed from:

event.dataset:(googlecloud.audit or gcp.audit) and
event.action:google.iam.admin.v*.CreateRole and event.outcome:success

Version 6 (8.1.0 release)

Formatting only

Version 5 (7.13.0 release)

Formatting only

Version 4 (7.12.0 release)

Formatting only

Version 3 (7.11.2 release)

Formatting only

Version 2 (7.11.0 release)

Updated query, changed from:

event.dataset:googlecloud.audit and
event.action:google.iam.admin.v*.CreateRole and event.outcome:success

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