LoFP / trail updates may be made by a system or network administrator. verify whether the user identity, user agent, and/or hostname should be making changes in your environment. trail updates from unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.

Techniques

• T1530
• T1565

Sample rules

AWS CloudTrail Log Updated

• source: elastic
• technicques:
  • T1530
  • T1565

Description

Detects updates to an existing CloudTrail trail via UpdateTrail API which may reduce visibility, change destinations, or weaken integrity (e.g., removing global events, moving the S3 destination, or disabling validation). Adversaries can modify trails to evade detection while maintaining a semblance of logging. Validate any configuration change against approved baselines.

Detection logic

event.dataset: "aws.cloudtrail" 
    and event.provider: "cloudtrail.amazonaws.com" 
    and event.action: "UpdateTrail" 
    and event.outcome: "success"