Sigma rule: AWS EFS Fileshare Mount Modified or Deleted

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-1d0ee27ae903, updated 2022-10-09T00:00:00.000Z.

Rule

Title
AWS EFS Fileshare Mount Modified or Deleted
Status
test
Level
medium
Author
Austin Songer @austinsonger
Date
2021-08-15
Modified
2022-10-09
File
rules/cloud/aws/cloudtrail/aws_efs_fileshare_mount_modified_or_deleted.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when a EFS Fileshare Mount is modified or deleted. An adversary breaking any file system using the mount target that is being deleted, which might disrupt instances or applications using those mounts.

Log source

product
aws
service
cloudtrail

Detection

selection:
    eventSource: elasticfilesystem.amazonaws.com
    eventName: DeleteMountTarget
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.impact
  • attack.t1485

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/aws/cloudtrail/aws_efs_fileshare_mount_modified_or_deleted.yml

Sources and licences

  • SigmaHQ

    "AWS EFS Fileshare Mount Modified or Deleted" by Austin Songer @austinsonger (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/aws/cloudtrail/aws_efs_fileshare_mount_modified_or_deleted.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: AWS EFS Fileshare Mount Modified or Deleted",
entity page, dataset version ref-1d0ee27ae903, updated 2022-10-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/6a7ba45c-63d8-473e-9736-2eaabff79964 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 6a7ba45c-63d8-473e-9736-2eaabff79964, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.