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 by unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.

t1133
aws
elastic

Techniques

T1133

Sample rules

AWS EC2 Network Access Control List Creation

source: elastic
technicques:
- T1133

Description

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.

Detection logic

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