SilverFox BYOVD campaign uses multiple drivers to deploy ValleyRAT in Japan
Source headline: SilverFox Targets Japanese Manufacturer with 3-Driver BYOVD Chain and ValleyRAT
Intelligence Summary
The SilverFox cybercrime group is targeting a Japanese industrial manufacturer using a bring-your-own-vulnerable-driver (BYOVD) approach. The intrusion chain relies on abusing vulnerable drivers to execute code and bypass security controls. The campaign then delivers ValleyRAT (also tracked as Winos 4.0) to maintain persistent remote access. This matters because driver abuse can provide powerful system-level execution and evade conventional defenses. Organizations in industrial and manufacturing environments should review endpoint driver integrity and hunt for ValleyRAT-related persistence and remote access indicators.
Recommended Action
Review affected assets, schedule urgent remediation, and monitor related indicators.