aws_password_policy_changes.yml

name: AWS Password Policy Changes
id: aee4a575-7064-4e60-b511-246f9baf9895
version: 1
date: '2023-01-26'
author: Bhavin Patel, Splunk
status: production
type: Hunting
description: This search looks for AWS CloudTrail events where a user is making successful
  API calls to view/update/delete the existing password policy in an AWS organization.
  It is unlikely for a regular user to conduct this operation. These events may potentially
  be malicious, adversaries often use this information to gain more understanding
  of the password defenses in place and exploit them to increase their attack surface
  when a user account is compromised.
data_source: []
search: '`cloudtrail` eventName IN ("UpdateAccountPasswordPolicy","GetAccountPasswordPolicy","DeleteAccountPasswordPolicy")
  errorCode=success | stats count values(eventName) as eventName values(userAgent)
  min(_time) as firstTime max(_time) as lastTime by eventSource aws_account_id errorCode  awsRegion
  userIdentity.principalId user_arn src_ip | `security_content_ctime(firstTime)` |
  `security_content_ctime(lastTime)`  | `aws_password_policy_changes_filter`'
how_to_implement: You must install Splunk AWS Add on and Splunk App for AWS. This
  search works with AWS CloudTrail logs.
known_false_positives: While this search has no known false positives, it is possible
  that an AWS admin has legitimately triggered an AWS audit tool activity which may
  trigger this event.
references:
- https://www.trendmicro.com/cloudoneconformity/knowledge-base/aws/IAM/password-policy.html
tags:
  analytic_story:
  - AWS IAM Privilege Escalation
  - Compromised User Account
  asset_type: AWS Account
  confidence: 80
  impact: 90
  message: User $user_arn$ is attempting to $eventName$ the password policy for account
    id $aws_account_id$
  mitre_attack_id:
  - T1201
  observable:
  - name: src_ip
    type: IP Address
    role:
    - Attacker
  - name: user_arn
    type: User
    role:
    - Attacker
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - eventName
  - userAgent
  - errorCode
  - requestParameters.userName
  - eventSource
  - user_arn
  - aws_account_id
  - src_ip
  risk_score: 72
  security_domain: threat
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1201/aws_password_policy/cloudtrail.json
    sourcetype: aws:cloudtrail
    source: aws_cloudtrail
    update_timestamp: true