Suspicious Mass Locked Extension File Creation by Ransomware

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 creation of files with a locked extension, the encryption footprint left by the evolved JADEPUFFER ransomware as it encrypts AI model files across the host. Each encrypted file is renamed with this suffix during the impact phase. A burst of such files indicates active ransomware encryption requiring immediate response.

Reporting behind it

Related detections9 linkedT1486 — drag to rearrange

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Malicious GigaWiper Ransomware File Extension .candy

Malicious Forced BitLocker Encryption for Extortion (via process_creation)

Malicious Volume Shadow Copy Deletion via Vssadmin

Malicious CACTUS Ransomware Note and Encrypted File Artifacts (via file_event)

Suspicious Mass Locked Extension File Creation by Ransomware

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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