[Rule Tunings] AWS RDS Rules

[imays11]

Pull Request

Issue link(s):

• https://github.com/elastic/ia-trade-team/issues/616

Summary - What I changed

All of these RDS rules are triggering as expected. Only AWS RDS Snapshot Deleted had clear false positive in telemetry which has been excluded from the rule. Below is a summary of each rule change and screenshots of each rule triggering with additional screenshots of the new working queries for the eql rules using event.type as event_category_override

AWS RDS DB Instance Made Public

• updated description and investigation guide
• added highlighted fields

AWS RDS DB Instance or Cluster Deletion Protection Disabled

• updated description and investigation guide
• added highlighted fields

AWS RDS Snapshot Deleted

• excluded backup.amazonaws.com as this is expected behavior. This exclusion reduces noise in telemetry by ~77%
• updated description and investigation guide
• added highlighted fields

AWS Deletion of RDS Instance or Cluster > AWS RDS DB Instance or Cluster Deleted

• reduced execution window
• slight name change to align with other rules
• updated description and investigation guide
• added highlighted fields

AWS RDS DB Instance Restored

• changed rule type from eql to kql since there's no reason for using eql for this rule query
• updated description and investigation guide
• added highlighted fields

AWS RDS DB Instance or Cluster Password Modified

• event.type used for event_category_override because event.category is not mapped for these API calls
• updated description and investigation guide
• added highlighted fields

AWS RDS Snapshot Export

• reduced execution window
• updated mitre mapping
• updated description and investigation guide
• added highlighted fields

How To Test

There is plenty of data to run these queries against in our test stack and a set of scripts can be found here: RDS