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 EC2 EBS Snapshot Shared to External AWS Account (via cloudtrail)

Suspicious RDS Snapshot Shared to External AWS Account for Exfiltration (via cloudtrail)

Suspicious S3 Bucket Replication Configured via Scattered Spider Exfiltration Technique

Suspicious AWS Instance Access or Export via SSH Key or Export Task

Suspicious Container Image Export via ctr in Cloud Model Exfiltration

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

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 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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