AWS Snapshot Backup Exfiltration — Sigma Rule

Rule metadata and linked tags

Author: Darin Smith. Source status: test; severity: medium. Source dates: 2021-05-17 / 2021-08-19.

{
  "product": "aws",
  "service": "cloudtrail"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f51c4544237d7eba85fc71f3e3bfbda7683331852c83ec502e14a180da563d96

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: AWS Snapshot Backup Exfiltration
id: abae8fec-57bd-4f87-aff6-6e3db989843d
status: test
description: Detects the modification of an EC2 snapshot's permissions to enable access from another account
references:
    - https://www.justice.gov/file/1080281/download
author: Darin Smith
date: 2021-05-17
modified: 2021-08-19
tags:
    - attack.exfiltration
    - attack.t1537
logsource:
    product: aws
    service: cloudtrail
detection:
    selection_source:
        eventSource: ec2.amazonaws.com
        eventName: ModifySnapshotAttribute
    condition: selection_source
falsepositives:
    - Valid change to a snapshot's permissions
level: medium

Original YAML and metadata in JSON

False positives

• Valid change to a snapshot's permissions

Source references

• https://www.justice.gov/file/1080281/download