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Mass File Rename - Filename and Extension Fully Overwritten

Zawoo Encryption / Impact Sentinel
MITRE ATT&CK
Data Encrypted for Impact
Data Source
DeviceFileEvents
Date Added
2026-09-18
Last Updated
2026-09-18
Source
SOCRadar, WatchGuard ransomware tracker
What This Detects
Unlike typical ransomware that appends a fixed suffix (e.g. .lockbit), ZaWoo completely overwrites both the original filename and extension, so a static-extension detection rule will miss it — this query flags the rename pattern itself instead.
Query
DeviceFileEvents
| where ActionType == "FileRenamed"
| extend OldExt = tostring(split(PreviousFileName, ".")[-1]), NewExt = tostring(split(FileName, ".")[-1])
| where OldExt != NewExt
| summarize RenameCount = count(), Extensions = make_set(NewExt) by DeviceName, bin(Timestamp, 5m)
| where RenameCount > 50

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.