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 Logging Sink Deletion

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GCP Logging Sink Deletion

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Identifies a Logging sink deletion in Google Cloud Platform (GCP). Every time a log entry arrives, Logging compares the log entry to the sinks in that resource. Each sink whose filter matches the log entry writes a copy of the log entry to the sink’s export destination. An adversary may delete a Logging sink to evade detection.

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/logging/docs/export

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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Logging sink 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. Logging sink 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.logging.v*.ConfigServiceV*.DeleteSink 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.logging.v*.ConfigServiceV*.DeleteSink 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.logging.v*.ConfigServiceV*.DeleteSink and
event.outcome:success

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