Possible Azure Storage Ransomware via Customer-Managed Key Encryption

ATT&CK techniques

Defense Evasion → Impact

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1578.001Create Snapshot
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
- T1486Data Encrypted for Impact

What it detects

This rule detects Azure Activity operations that rewrite storage account encryption to attacker-controlled key material, a hijack path for blob storage ransomware. Writing an encryption scope or setting the account key source to Key Vault lets an actor re-encrypt blobs under a key they hold and then deny the victim access. These control-plane encryption changes on production storage accounts warrant urgent review.

Reporting behind it

Related detections9 linkedT1486 — drag to rearrange

Malicious Remote Encryptor Execution via WMIC Process Call Create (Chaos Ransomware)

Suspicious CyberLock Ransomware Encrypted File Creation

Rhysida Ransomware Encrypted File Extension Created

Phobos 8Base Ransomware Encrypted File Extension Created

Rhysida Ransomware Note CriticalBreachDetected.pdf Created

Possible Akira Ransomware Note or Encrypted Extension Creation

Malicious Storm-2603 Ransom Note File Creation

Possible Ransomware Note or Encrypted File Extension Creation

BitLocker Feature Activation on Multiple Hosts - Native (via bitlocker)

Possible Azure Storage Ransomware via Customer-Managed Key Encryption

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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