Sigma rule: New Network ACL Entry Added

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-34787facc3c2, updated 2024-07-11T00:00:00.000Z.

Rule

Title
New Network ACL Entry Added
Status
test
Level
low
Author
jamesc-grafana
Date
2024-07-11
File
rules/cloud/aws/cloudtrail/aws_cloudtrail_new_acl_entries.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects that network ACL entries have been added to a route table which could indicate that new attack vectors have been opened up in the AWS account.

Log source

product
aws
service
cloudtrail

Detection

selection:
    eventSource: 'ec2.amazonaws.com'
    eventName: 'CreateNetworkAclEntry'
condition: selection

False positives (as the rule lists them)

  • Legitimate use of ACLs to enable customer and staff access from the public internet into a public VPC

Tags

  • attack.defense-impairment
  • attack.t1686.001

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/aws/cloudtrail/aws_cloudtrail_new_acl_entries.yml

Sources and licences

  • SigmaHQ

    "New Network ACL Entry Added" by jamesc-grafana (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/aws/cloudtrail/aws_cloudtrail_new_acl_entries.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: New Network ACL Entry Added",
entity page, dataset version ref-34787facc3c2, updated 2024-07-11T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/e1f7febb-7b94-4234-b5c6-00fb8500f5dd (accessed 2026-11-03).
Underlying source: SigmaHQ rule e1f7febb-7b94-4234-b5c6-00fb8500f5dd, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.