AWS EFS File System or Mount Deletededit

Detects when a EFS File System or Mount is deleted. An adversary could break any file system using the mount target that is being deleted, which might disrupt instances or applications using those mounts. The mount must be deleted prior to deleting the File System, or the adversary will be unable to delete the File System.

Rule type: query

Rule indices:

  • filebeat-*
  • logs-aws*

Severity: medium

Risk score: 47

Runs every: 10 minutes

Searches indices from: now-60m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100



  • Elastic
  • Cloud
  • AWS
  • Continuous Monitoring
  • SecOps
  • Data Protection

Version: 1

Added (Elastic Stack release): 7.16.0

Rule authors: Austin Songer

Rule license: Elastic License v2

Potential false positivesedit

File System or Mount being deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. File System Mount deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guideedit

## Config

The AWS Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

Rule queryedit

event.dataset:aws.cloudtrail and and
event.action:(DeleteMountTarget or DeleteFileSystem) and

Threat mappingedit