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Enumerate Cloudtrails for a Given Region

Author Last Update
Nick Jones 2020-06-18

An adversary may attempt to enumerate the configured trails, to identify what actions will be logged and where they will be logged to. In AWS, this may start with a single call to enumerate the trails applicable to the default region.

MITRE IDs

Required Permissions

  • cloudtrail:DescribeTrails

Required Parameters

None

Attacker Action

aws cloudtrail describe-trails

Detection Case

ELK query

When logs are ingested into ELK, the following Lucene query can be used to identify relevant events.

eventName:DescribeTrails AND eventSource:*.cloudtrail.amazonaws.com  

Sigma Definition

---
title: Enumerate Cloudtrails for a Given Region
id: 48653a63-085a-4a3b-88be-9680e9adb449
status: experimental
author: Nick Jones
date: 2020-06-18
description: An adversary may attempt to enumerate the configured trails, to identify what actions will be logged and where they will be logged to. In AWS, this may start with a single call to enumerate the trails applicable to the default region.
logsource:
  service: cloudtrail
detection:
  selection_source:
    - eventSource: "*.cloudtrail.amazonaws.com"
  events:
    - eventName: "DescribeTrails"
  condition: selection_source AND events
level: low
tags:
  - attack.t1089