AWS EC2 Network Access Control List Creationedit
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-*
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:
- https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/create-network-acl.html
- https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateNetworkAcl.html
- https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/create-network-acl-entry.html
- https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateNetworkAclEntry.html
Tags:
- AWS
- Elastic
- SecOps
- Network
- Continuous Monitoring
Version: 1
Added (Elastic Stack release): 7.9.0
Rule authors: Elastic
Rule license: Elastic License
Potential false positivesedit
Network ACLs 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 a known behavior is causing false positives, it can be excluded from the rule.
Investigation guideedit
The AWS Filebeat module must be enabled to use this rule.
Rule queryedit
event.action:(CreateNetworkAcl or CreateNetworkAclEntry) and event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and event.outcome:success
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Redundant Access
- ID: T1108
- Reference URL: https://attack.mitre.org/techniques/T1108/