Suspicious LucidRook DismCore.dll Side-Load into Browser Process

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 the DISM component DismCore.dll being loaded by msedge.exe, matching the LucidRook side-loading chain where a renamed DISM host loads a trojanized DismCore.dll. Microsoft Edge has no legitimate reason to load DISM servicing libraries, so this pairing reveals DLL search-order hijacking. The load indicates the LucidRook implant is being activated.

Reporting behind it

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Suspicious Commonly-Hijacked DLL Loaded From a User-Writable Path (via image_load)

Suspicious LucidRook DismCore.dll Side-Load into Browser Process

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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