Suspicious LucidRook DLL Side-Loading via Renamed msedge.exe

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1574.001DLL
Persistence
- T1574.001DLL
Priv Esc
- T1574.001DLL
Defense Evasion
- T1574.001DLL
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects msedge.exe executing from a WindowsApps directory under the user profile, matching the LucidRook loader that renames the DISM index.exe binary to msedge.exe to side-load a malicious DismCore.dll. Legitimate Microsoft Edge runs from Program Files, so an msedge.exe launched from AppData WindowsApps is an impostor used for search-order hijacking. This behavior indicates initial execution of the Lua-based LucidRook malware.

Reporting behind it

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Suspicious LucidRook DLL Side-Loading via Renamed msedge.exe

Pivot detection · T1574.001 · 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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