Malicious Snowflake Bulk Data Exfiltration via External Stage COPY INTO (via cloud)

ATT&CK techniques

Collection → Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
- T1213Data from Information Repositories
C2
Exfiltration
- T1567.002Exfiltration to Cloud Storage
Impact

What it detects

This rule detects Snowflake query activity that stages an entire table into a temporary stage and copies it out with GZIP compression, matching the UNC5537 exfiltration playbook that used CREATE TEMPORARY STAGE followed by COPY INTO and GET to pull data from compromised customer instances. Bulk staged exports are a hallmark of Snowflake data theft and extortion operations.

Reporting behind it

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Malicious Snowflake Bulk Data Exfiltration via External Stage COPY INTO (via cloud)

Pivot detection · T1567.002 · 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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