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

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baseline:
  splunk:
    schedule:
      cron_schedule: ''
      earliest_time: -30d@d
      latest_time: -10m@m
    search: sourcetype=aws:cloudtrail `network_acl_events` | 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 network_acl_activity_baseline | stats
      count
creation_date: '2018-05-21'
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 of the number of API calls that were related to network ACLs 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 network ACLs for
  the users who initiated this activity. It returns all logged API calls for network
  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 network ACLs, edit the macro `network_acl_events`.
id: fc0edd96-ff2b-4810-9f1f-63da3783fd63
known_false_positives: ''
maintainers:
  - company: Splunk
    email: bpatel@splunk.com
    name: Bhavin Patel
modification_date: '2018-05-21'
name: Baseline of Network ACL Activity by ARN
original_authors:
  - company: Splunk
    email: bpatel@splunk.com
    name: Bhavin Patel
spec_version: 2
type: splunk
version: '1.0'