AWS EC2 Network Access Control List Deletionedit
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-*
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:
- https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/delete-network-acl.html
- https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteNetworkAcl.html
- https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/delete-network-acl-entry.html
- https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteNetworkAclEntry.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 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 guideedit
The AWS Filebeat module must be enabled to use this rule.
Rule queryedit
event.action:(DeleteNetworkAcl or DeleteNetworkAclEntry) and event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and event.outcome:success
Threat mappingedit
Framework: MITRE ATT&CKTM
-
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/