Suspicious EC2 Snapshot Attribute Modification for External Sharing via CloudTrail

ATT&CK techniques

Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
- T1537Transfer Data to Cloud Account
Impact

What it detects

This rule detects the ModifySnapshotAttribute CloudTrail event which attackers use to share an EBS snapshot with an external AWS account for data exfiltration as highlighted in this Elastic analysis. Sharing snapshots outside the organization is a low volume administrative action that when unexpected indicates exfiltration of volume data.

Reporting behind it

Related detections9 linkedT1537 — drag to rearrange

Suspicious Cross-Project Compute Snapshot Creation via GCP Audit

Suspicious Compute Disk IAM Policy Modification Granting Owner Role via GCP Audit

Suspicious EBS Snapshot Shared With External Account via CloudTrail

Suspicious GCP Bucket Deletion for Namespace Hijacking (via gcp)

GitHub Audit Log: Repository or Organization Transfer Detected

GitHub Audit Logs: Private/Internal Forking Policy Enabled or Cleared

Microsoft 365 SecurityComplianceCenter: Exfiltration Activity to Unsanctioned Apps

AWS CloudTrail S3 Bucket/Replication Configuration Tampering via Management API Calls

AWS CloudTrail: EC2 Snapshot Attribute Permission Modified for Cross-Account Access

Suspicious EC2 Snapshot Attribute Modification for External Sharing via CloudTrail

Pivot detection · T1537 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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