security-content/baselines/baseline_security_group_activity_by_arn.yml at develop · jwindley-splunk/security-content · GitHub

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baseline:
  splunk:
    schedule:
      cron_schedule: ''
      earliest_time: -90d@d
      latest_time: -10m@m
    search: sourcetype=aws:cloudtrail `security_group_api_calls` | spath output=arn path=userIdentity.arn
      | bucket _time span=1h | stats count as apiCalls by _time, arn | stats count(apiCalls)
      as numDataPoints, latest(apiCalls) as latestCount, avg(apiCalls) as avgApiCalls,
      stdev(apiCalls) as stdevApiCalls by arn | table arn, latestCount, numDataPoints,
      avgApiCalls, stdevApiCalls | outputlookup security_group_activity_baseline |
      stats count
creation_date: '2018-04-17'
data_metadata:
  data_source:
    - AWS CloudTrail logs
  data_sourcetypes:
    - aws:cloudtrail
  providing_technologies:
    - AWS
description: This search establishes, on a per-hour basis, the average and the standard
  deviation for the number of API calls related to security groups made by each user.
  Also recorded is the number of data points for each user. This table is then outputted
  to a lookup file to allow the detection search to operate quickly.
eli5: Use this search to create a baseline for API calls related to security groups
  by the users who initiated this activity. It returns all logged API calls for all
  security-group-related activity, pulls out the ARN that initiated each call, and
  collects the `eventNames` in one-hour groupings. Next, it calculates the number
  of API calls made per ARN per hour. For each ARN, it calculates the average and
  standard deviation of this count on a per-hour basis. It also includes the number
  of data points for each ARN. This table is stored in a lookup file.
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. To add or remove API event names for security groups, edit the macro `security_group_api_calls`.
id: fc0edd96-ff2b-48b0-9f1f-63da3783fd63
known_false_positives: ''
maintainers:
  - company: Splunk
    email: bpatel@splunk.com
    name: Bhavin Patel
modification_date: '2018-04-17'
name: Baseline of Security Group Activity by ARN
original_authors:
  - company: Splunk
    email: bpatel@splunk.com
    name: Bhavin Patel
spec_version: 2
type: splunk
version: '1.0'