RDS Database Security Group Modification — Sigma Rule

Rule metadata and linked tags

Author: jamesc-grafana. Source status: test; severity: medium. Source dates: 2024-07-11 / not supplied.

{
  "product": "aws",
  "service": "cloudtrail"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7d556a2914fb4c6ecc907a45b029d51084b05c26dfe00b0b610b99c92146fa72

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: RDS Database Security Group Modification
id: 14f3f1c8-02d5-43a2-a191-91ffb52d3015
status: test
description: |
    Detects changes to the security group entries for RDS databases.
    This can indicate that a misconfiguration has occurred which potentially exposes the database to the public internet, a wider audience within the VPC or that removal of valid rules has occurred which could impact the availability of the database to legitimate services and users.
references:
    - https://www.gorillastack.com/blog/real-time-events/important-aws-cloudtrail-security-events-tracking/
author: jamesc-grafana
date: 2024-07-11
tags:
    - attack.initial-access
    - attack.t1190
logsource:
    product: aws
    service: cloudtrail
detection:
    selection:
        eventSource: 'rds.amazonaws.com'
        eventName:
            - 'AuthorizeDBSecurityGroupIngress'
            - 'CreateDBSecurityGroup'
            - 'DeleteDBSecurityGroup'
            - 'RevokeDBSecurityGroupIngress'
    condition: selection
falsepositives:
    - Creation of a new Database that needs new security group rules
level: medium

Original YAML and metadata in JSON

False positives

• Creation of a new Database that needs new security group rules

Source references

• https://www.gorillastack.com/blog/real-time-events/important-aws-cloudtrail-security-events-tracking/