AWS S3 Bucket Replicated to Another Account

Last updated 7 months ago on 2025-01-10

Created a year ago on 2024-07-12

About

Identifies when the `PutBucketReplication` operation is used to replicate S3 objects to a bucket in another AWS account. Adversaries may use bucket replication to exfiltrate sensitive data to an environment they control.

Tags

Domain: CloudData Source: AWSData Source: Amazon Web ServicesData Source: AWS S3Use Case: Threat DetectionTactic: ExfiltrationLanguage: eql

Severity

medium

Risk Score

MITRE ATT&CK™

Exfiltration (TA0010)(opens in a new tab or window)

↳ Transfer Data to Cloud Account (T1537)(opens in a new tab or window)

False Positive Examples

Bucket replication accross accounts is a legitimate practice in some AWS environments. Ensure that the sharing is authorized before taking action.

License

Elastic License v2(opens in a new tab or window)

Definition

Rule Type: Event Correlation Rule
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: filebeat-*logs-aws.cloudtrail-*
Related Integrations: aws(opens in a new tab or window)
Query

any where event.dataset == "aws.cloudtrail"
   and event.action == "PutBucketReplication"
   and event.outcome == "success"
   and stringContains(aws.cloudtrail.request_parameters, "Account")

Install detection rules in Elastic Security

Detect AWS S3 Bucket Replicated to Another Account in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).