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Rapid Mass File Modification Burst (Sub-24h Encryption)

Spirals Encryption / Impact Sentinel
MITRE ATT&CK
Data Encrypted for Impact
Data Source
DeviceFileEvents
Date Added
2026-09-18
Last Updated
2026-09-18
Source
security.com/threat-intelligence/ransomware-spirals-extortion
What This Detects
Spirals is a custom Rust encryptor (per-file AES-128 keys wrapped via attacker ECDH P-256 pubkey) that encrypts an entire network in under 24 hours from initial access — unusually fast, so short-window burst detection matters more than dwell-time-based hunts.
Query
DeviceFileEvents
| where ActionType == "FileModified"
| summarize FileCount = dcount(FileName) by DeviceName, bin(Timestamp, 5m)
| where FileCount > 100

Hunting queries are starting points for threat hunting & detection engineering — validate table/column names against your own workspace schema and tune thresholds before turning any of these into a production alert rule.