Data Source: AWS CloudTrail PutBucketAcl

Date: 2025-01-23

ID: 28fffbfd-d98d-4a42-990b-b04ab47422eb

Author: Patrick Bareiss, Splunk

Description

Logs an event when an ACL is set or modified for an S3 bucket in AWS CloudTrail.

Details

Property	Value
Source	`aws_cloudtrail`
Sourcetype	`aws:cloudtrail`
Separator	eventName

Supported Apps

Splunk Add-on for AWS (version 7.10.0)

Event Fields

+ Fields

  <span class="pill kill-chain">_time</span>
  
  <span class="pill kill-chain">action</span>
  
  <span class="pill kill-chain">additionalEventData.AuthenticationMethod</span>
  
  <span class="pill kill-chain">additionalEventData.CipherSuite</span>
  
  <span class="pill kill-chain">additionalEventData.SignatureVersion</span>
  
  <span class="pill kill-chain">additionalEventData.bytesTransferredIn</span>
  
  <span class="pill kill-chain">additionalEventData.bytesTransferredOut</span>
  
  <span class="pill kill-chain">additionalEventData.x-amz-id-2</span>
  
  <span class="pill kill-chain">app</span>
  
  <span class="pill kill-chain">awsRegion</span>
  
  <span class="pill kill-chain">aws_account_id</span>
  
  <span class="pill kill-chain">change_type</span>
  
  <span class="pill kill-chain">command</span>
  
  <span class="pill kill-chain">date_hour</span>
  
  <span class="pill kill-chain">date_mday</span>
  
  <span class="pill kill-chain">date_minute</span>
  
  <span class="pill kill-chain">date_month</span>
  
  <span class="pill kill-chain">date_second</span>
  
  <span class="pill kill-chain">date_wday</span>
  
  <span class="pill kill-chain">date_year</span>
  
  <span class="pill kill-chain">date_zone</span>
  
  <span class="pill kill-chain">dest</span>
  
  <span class="pill kill-chain">dvc</span>
  
  <span class="pill kill-chain">errorCode</span>
  
  <span class="pill kill-chain">eventCategory</span>
  
  <span class="pill kill-chain">eventID</span>
  
  <span class="pill kill-chain">eventName</span>
  
  <span class="pill kill-chain">eventSource</span>
  
  <span class="pill kill-chain">eventTime</span>
  
  <span class="pill kill-chain">eventType</span>
  
  <span class="pill kill-chain">eventVersion</span>
  
  <span class="pill kill-chain">eventtype</span>
  
  <span class="pill kill-chain">host</span>
  
  <span class="pill kill-chain">index</span>
  
  <span class="pill kill-chain">linecount</span>
  
  <span class="pill kill-chain">managementEvent</span>
  
  <span class="pill kill-chain">msg</span>
  
  <span class="pill kill-chain">object</span>
  
  <span class="pill kill-chain">object_category</span>
  
  <span class="pill kill-chain">object_id</span>
  
  <span class="pill kill-chain">product</span>
  
  <span class="pill kill-chain">punct</span>
  
  <span class="pill kill-chain">readOnly</span>
  
  <span class="pill kill-chain">recipientAccountId</span>
  
  <span class="pill kill-chain">region</span>
  
  <span class="pill kill-chain">requestID</span>
  
  <span class="pill kill-chain">requestParameters.Host</span>
  
  <span class="pill kill-chain">requestParameters.accessControlList.x-amz-grant-write-acp</span>
  
  <span class="pill kill-chain">requestParameters.acl</span>
  
  <span class="pill kill-chain">requestParameters.bucketName</span>
  
  <span class="pill kill-chain">resources{}.ARN</span>
  
  <span class="pill kill-chain">resources{}.accountId</span>
  
  <span class="pill kill-chain">resources{}.type</span>
  
  <span class="pill kill-chain">responseElements</span>
  
  <span class="pill kill-chain">signature</span>
  
  <span class="pill kill-chain">source</span>
  
  <span class="pill kill-chain">sourceIPAddress</span>
  
  <span class="pill kill-chain">sourcetype</span>
  
  <span class="pill kill-chain">splunk_server</span>
  
  <span class="pill kill-chain">src</span>
  
  <span class="pill kill-chain">src_ip</span>
  
  <span class="pill kill-chain">src_user</span>
  
  <span class="pill kill-chain">start_time</span>
  
  <span class="pill kill-chain">status</span>
  
  <span class="pill kill-chain">tag</span>
  
  <span class="pill kill-chain">tag::eventtype</span>
  
  <span class="pill kill-chain">timeendpos</span>
  
  <span class="pill kill-chain">timestartpos</span>
  
  <span class="pill kill-chain">user</span>
  
  <span class="pill kill-chain">userAgent</span>
  
  <span class="pill kill-chain">userIdentity.accessKeyId</span>
  
  <span class="pill kill-chain">userIdentity.accountId</span>
  
  <span class="pill kill-chain">userIdentity.arn</span>
  
  <span class="pill kill-chain">userIdentity.principalId</span>
  
  <span class="pill kill-chain">userIdentity.type</span>
  
  <span class="pill kill-chain">userIdentity.userName</span>
  
  <span class="pill kill-chain">userName</span>
  
  <span class="pill kill-chain">user_access_key</span>
  
  <span class="pill kill-chain">user_agent</span>
  
  <span class="pill kill-chain">user_arn</span>
  
  <span class="pill kill-chain">user_group_id</span>
  
  <span class="pill kill-chain">user_id</span>
  
  <span class="pill kill-chain">user_name</span>
  
  <span class="pill kill-chain">vendor</span>
  
  <span class="pill kill-chain">vendor_account</span>
  
  <span class="pill kill-chain">vendor_product</span>
  
  <span class="pill kill-chain">vendor_region</span>
  
</div>

Example Log

1{"eventVersion": "1.08", "userIdentity": {"type": "IAMUser", "principalId": "AIDAYTOGP2RLNALZHZ6KX", "arn": "arn:aws:iam::111111111111:user/patrick_cli", "accountId": "111111111111", "accessKeyId": "AKIAYTOGP2RLJ2OYSF6E", "userName": "patrick_cli"}, "eventTime": "2021-01-12T14:03:17Z", "eventSource": "s3.amazonaws.com", "eventName": "PutBucketAcl", "awsRegion": "eu-central-1", "sourceIPAddress": "95.90.199.65", "userAgent": "[aws-cli/2.0.45 Python/3.7.4 Darwin/20.2.0 exe/x86_64 command/s3api.put-bucket-acl]", "requestParameters": {"bucketName": "patricktestbucket19", "Host": "patricktestbucket19.s3.eu-central-1.amazonaws.com", "acl": "", "accessControlList": {"x-amz-grant-write-acp": "uri=http://acs.amazonaws.com/groups/global/AuthenticatedUsers"}}, "responseElements": null, "additionalEventData": {"SignatureVersion": "SigV4", "CipherSuite": "ECDHE-RSA-AES128-GCM-SHA256", "bytesTransferredIn": 0, "AuthenticationMethod": "AuthHeader", "x-amz-id-2": "qb+xR18y4+4serdq8conds+tNROklOFRYciGHof4z1pcnTnT9SCrx6iYHuupPNaiMnZ9kdB43yE=", "bytesTransferredOut": 0}, "requestID": "23FAB394417ECFCD", "eventID": "9feee3c9-711f-4f7d-af4c-992907a2a521", "readOnly": false, "resources": [{"accountId": "111111111111", "type": "AWS::S3::Bucket", "ARN": "arn:aws:s3:::patricktestbucket19"}], "eventType": "AwsApiCall", "managementEvent": true, "eventCategory": "Management", "recipientAccountId": "111111111111"}

Source: GitHub | Version: 2