LoFP / disabling encryption may be done by a system or network administrator. verify whether the user identity, user agent, and/or hostname should be making changes in your environment. disabling encryption by unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.

Techniques

• T1565

Sample rules

AWS EC2 Encryption Disabled

• source: elastic
• technicques:
  • T1565

Description

Detects when Amazon Elastic Block Store (EBS) encryption by default is disabled in an AWS region. EBS encryption ensures that newly created volumes and snapshots are automatically protected with AWS Key Management Service (KMS) keys. Disabling this setting introduces significant risk as all future volumes created in that region will be unencrypted by default, potentially exposing sensitive data at rest. Adversaries may disable encryption to weaken data protection before exfiltrating or tampering with EBS volumes or snapshots. This may be a step in preparation for data theft or ransomware-style attacks that depend on unencrypted volumes.

Detection logic

event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and event.action:DisableEbsEncryptionByDefault and event.outcome:success