Suspicious AWS EFS Fileshare Modified or Deleted (via cloudtrail)

title: Suspicious AWS EFS Fileshare Modified or Deleted (via cloudtrail)
id: 1037fb8a-0666-50e7-b6f6-c32617bd330e
status: stable
description: This rule detects when a EFS Fileshare is modified or deleted. You can't delete a file system that is in use. If the file system has any mount targets, the adversary must first delete them, so deletion of a mount will occur before deletion of a fileshare.
references:
    - https://docs.aws.amazon.com/efs/latest/ug/API_DeleteFileSystem.html
author: Huntrule Team
date: 2026-02-09
tags:
    - attack.impact
    - attack.t1485
logsource:
    product: aws
    service: cloudtrail
detection:
    selection:
        eventSource: elasticfilesystem.amazonaws.com
        eventName: DeleteFileSystem
    condition: selection
falsepositives:
    - Unknown
level: medium