valleyrat

The tag valleyrat covers the ValleyRAT backdoor malware, which is delivered through a bring-your-own-vulnerable-driver (BYOVD) attack. In this campaign, the Silver Fox group uses a Microsoft-signed but vulnerable kernel driver (amsdk.sys / WatchDog Antimalware) to terminate security processes on modern Windows systems, enabling the ValleyRAT payload to execute. The discussion focuses on the technical details of the driver abuse, the bypass of Windows kernel protections like Protected Processes and HVCI, and the implications for enterprise security. This tag is relevant for IT professionals and security researchers tracking advanced malware delivery techniques that exploit signed kernel drivers to disable defenses and deploy remote access trojans.