IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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GCP Pub/Sub Topic Deletion

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GCP Pub/Sub Topic Deletion

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Identifies the deletion of a topic in Google Cloud Platform (GCP). In GCP, the publisher-subscriber relationship (Pub/Sub) is an asynchronous messaging service that decouples event-producing and event-processing services. A publisher application creates and sends messages to a topic. Deleting a topic can interrupt message flow in the Pub/Sub pipeline.

Rule type: query

Rule indices:

filebeat-*
logs-gcp*

Severity: low

Risk score: 21

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/pubsub/docs/overview

Tags:

Elastic
Cloud
GCP
Continuous Monitoring
SecOps
Log Auditing

Version: 8 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Topic deletions 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. Topic deletions 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.pubsub.v*.Publisher.DeleteTopic and
event.outcome:success

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/

Rule version history

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Version 8 (8.4.0 release)

Updated query, changed from:

event.dataset:(googlecloud.audit or gcp.audit) and
event.action:google.pubsub.v*.Publisher.DeleteTopic 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.pubsub.v*.Publisher.DeleteTopic and
event.outcome:success

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