Suspicious EBS Snapshot Shared With External Account via CloudTrail

ATT&CK techniques

Defense Evasion → Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1578.001Create Snapshot
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
- T1537Transfer Data to Cloud Account
Impact

What it detects

This rule detects ModifySnapshotAttribute events that add CREATE_VOLUME_PERMISSION for a specific external AWS account, sharing an EBS snapshot outside the owner account. Adversaries share a snapshot they created with an attacker-controlled account so they can restore the volume elsewhere and exfiltrate its data. Externally sharing a snapshot bypasses direct data reads and is a known cloud exfiltration technique.

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 Container Image Export via ctr in Cloud Model Exfiltration

Suspicious AWS Transfer Family Server Creation for Data Exfiltration (via cloudtrail)

Suspicious EC2 Snapshot Attribute Modification for External Sharing via CloudTrail

Possible Azure Storage Ransomware via Customer-Managed Key Encryption

Suspicious GCP Bucket Deletion for Namespace Hijacking (via gcp)

Suspicious Azure CLI Disk Snapshot and Copy for Data Theft

GitHub Audit Log: Repository or Organization Transfer Detected

Suspicious EBS Snapshot Shared With External Account 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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