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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AWS EC2 Flow Log Deletion

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AWS EC2 Flow Log Deletion

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Identifies the deletion of one or more flow logs in AWS Elastic Compute Cloud (EC2). An adversary may delete flow logs in an attempt to evade defenses.

Rule type: query

Rule indices:

filebeat-*
logs-aws*

Severity: high

Risk score: 73

Runs every: 10 minutes

Searches indices from: now-60m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Elastic
Cloud
AWS
Continuous Monitoring
SecOps
Log Auditing

Version: 2 (version history)

Added (Elastic Stack release): 7.9.0

Last modified (Elastic Stack release): 7.10.0

Rule authors: Elastic

Rule license: Elastic License

Potential false positives

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Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Flow log deletions from unfamiliar users or hosts should be investigated. If a known behavior is causing false positives, it can be excluded from the rule.

Investigation guide

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The AWS Filebeat module must be enabled to use this rule.

Rule query

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event.action:DeleteFlowLogs and event.dataset:aws.cloudtrail and
event.provider:ec2.amazonaws.com 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: Disabling Security Tools
- ID: T1089
- Reference URL: https://attack.mitre.org/techniques/T1089/

Rule version history

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Version 2 (7.10.0 release)

Formatting only

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