previously_seen_aws_regions.yml

name: Previously Seen AWS Regions
id: fc0edc95-ff2b-48b0-9f6f-63da3789fd63
version: 1
date: '2018-01-08'
author: Bhavin Patel, Splunk
type: Baseline
datamodel: []
description: This search looks for CloudTrail events where an AWS instance is started
  and creates a baseline of most recent time (latest) and the first time (earliest)
  we've seen this region in our dataset grouped by the value awsRegion for the last
  30 days
search: '`cloudtrail` StartInstances | stats earliest(_time) as earliest latest(_time)
  as latest by awsRegion | outputlookup previously_seen_aws_regions| stats count'
how_to_implement: You must install the AWS App for Splunk (version 5.1.0 or later)
  and Splunk Add-on for AWS version (4.4.0 or later), then configure your CloudTrail
  inputs.
known_false_positives: none
references: []
tags:
  analytic_story:
  - AWS Cryptomining
  - Suspicious AWS EC2 Activities
  detections:
  - EC2 Instance Started In Previously Unseen Region
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - awsRegion
  security_domain: network