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 Creation

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AWS EC2 Network Access Control List Creation

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Identifies the creation of an AWS Elastic Compute Cloud (EC2) network access control list (ACL) or an entry in a network ACL with a specified rule number.

Rule type: query

Rule indices:

filebeat-*
logs-aws*

Severity: low

Risk score: 21

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: 6 (version history)

Added (Elastic Stack release): 7.9.0

Last modified (Elastic Stack release): 7.13.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Network ACL’s may be created by a network administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Network ACL creations from 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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Config

The AWS Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

Rule query

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event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and
event.action:(CreateNetworkAcl or CreateNetworkAclEntry) and
event.outcome:success

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: External Remote Services
- ID: T1133
- Reference URL: https://attack.mitre.org/techniques/T1133/

Rule version history

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Version 6 (7.13.0 release)

Updated query, changed from:

event.action:(CreateNetworkAcl or CreateNetworkAclEntry) and
event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and
event.outcome:success

Version 5 (7.12.0 release)

Formatting only

Version 4 (7.11.2 release)

Formatting only

Version 3 (7.11.0 release)

Formatting only

Version 2 (7.10.0 release)

Formatting only

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