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 Network Access Control List Deletion

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AWS EC2 Network Access Control List Deletion

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Identifies the deletion of an Amazon Elastic Compute Cloud (EC2) network access control list (ACL) or one of its ingress/egress entries.

Rule type: query

Rule indices:

filebeat-*
logs-aws*

Severity: medium

Risk score: 47

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
Network Security

Version: 5 (version history)

Added (Elastic Stack release): 7.9.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Network ACLs may be deleted by a network administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Network ACL 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:(DeleteNetworkAcl or DeleteNetworkAclEntry) and
event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and
event.outcome:success