name: AWS CloudTrail SetDefaultPolicyVersion
id: 06e0b5a0-8d36-485e-befc-4ae79d77ef6c
version: 3
creation_date: '2024-05-22'
modification_date: '2026-05-13'
author: Patrick Bareiss, Splunk
description: Logs an event when the default version of a resource policy in AWS is set or changed.
mitre_components:
    - Cloud Service Modification
    - Cloud Service Metadata
source: aws_cloudtrail
sourcetype: aws:cloudtrail
separator: eventName
separator_value: SetDefaultPolicyVersion
supported_TA:
    - name: Splunk Add-on for AWS
      url: https://splunkbase.splunk.com/app/1876
      version: 8.1.2
fields:
    - _time
    - action
    - app
    - awsRegion
    - aws_account_id
    - change_type
    - command
    - date_hour
    - date_mday
    - date_minute
    - date_month
    - date_second
    - date_wday
    - date_year
    - date_zone
    - dest
    - dvc
    - errorCode
    - eventCategory
    - eventID
    - eventName
    - eventSource
    - eventTime
    - eventType
    - eventVersion
    - eventtype
    - host
    - index
    - linecount
    - managementEvent
    - msg
    - object_category
    - product
    - punct
    - readOnly
    - recipientAccountId
    - region
    - requestID
    - requestParameters.policyArn
    - requestParameters.versionId
    - responseElements
    - signature
    - source
    - sourceIPAddress
    - sourcetype
    - splunk_server
    - src
    - src_ip
    - start_time
    - status
    - tag
    - tag::eventtype
    - timeendpos
    - timestartpos
    - user
    - userAgent
    - userIdentity.accessKeyId
    - userIdentity.accountId
    - userIdentity.arn
    - userIdentity.principalId
    - userIdentity.type
    - userIdentity.userName
    - userName
    - user_access_key
    - user_agent
    - user_arn
    - user_group_id
    - user_id
    - user_name
    - user_type
    - vendor
    - vendor_account
    - vendor_product
    - vendor_region
output_fields:
    - dest
    - user
    - user_agent
    - src
    - vendor_account
    - vendor_region
    - vendor_product
example_log: '{"eventVersion": "1.08", "userIdentity": {"type": "IAMUser", "principalId": "AIDAYTOGP2RLESDK2NOSX", "arn": "arn:aws:iam::111111111111:user/AtomicRedTeam", "accountId": "111111111111", "accessKeyId": "AKIAYTOGP2RLKMZDMPVA", "userName": "AtomicRedTeam"}, "eventTime": "2021-03-02T21:05:49Z", "eventSource": "iam.amazonaws.com", "eventName": "SetDefaultPolicyVersion", "awsRegion": "us-east-1", "sourceIPAddress": "73.15.72.101", "userAgent": "aws-cli/2.0.62 Python/3.9.0 Darwin/19.6.0 source/x86_64 command/iam.set-default-policy-version", "requestParameters": {"policyArn": "arn:aws:iam::111111111111:policy/VulnerablePolicy", "versionId": "v1"}, "responseElements": null, "requestID": "3bdf8738-2eab-4ae8-a858-2e2a4ccfc66b", "eventID": "742f6e55-4bc7-49e2-965f-56ffbc46a980", "readOnly": false, "eventType": "AwsApiCall", "managementEvent": true, "eventCategory": "Management", "recipientAccountId": "111111111111"}'