Malicious S3 Object Encryption for Ransom via SSE-C

ATT&CK techniques

Impact

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
- T1486Data Encrypted for Impact

What it detects

This rule detects an S3 PutObject call that supplies a customer provided encryption key using server side encryption with customer keys, the core primitive of the AWS S3 SSE-C ransom scenario emulated by Elastic. By overwriting objects with a key only the attacker holds the adversary makes bucket data unrecoverable to the owner and demands payment. SSE-C on writes is uncommon in most environments and can indicate destructive ransom activity.

Reporting behind it

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Malicious DEVMAN Ransomware Encrypted File and Note Artifacts

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Malicious S3 Object Encryption for Ransom via SSE-C

Pivot detection · T1486 · 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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