Malicious S3 Object Encryption with Customer Provided Key via CopyObject

ATT&CK techniques

Impact

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
- T1485Data Destruction
- T1486Data Encrypted for Impact

What it detects

This rule detects S3 CopyObject or PutObject API calls that supply a customer provided SSE-C encryption key which is the technique used in the CopyObjection intrusion to encrypt a victim S3 bucket for ransom. Because the attacker holds the key AWS cannot recover the data making this a destructive extortion action. Detecting SSE-C on bulk object operations surfaces ransomware activity in cloud storage.

Reporting behind it

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Malicious S3 Object Encryption with Customer Provided Key via CopyObject

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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