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Check Point Research uncovered an ongoing campaign by the Silver Fox APT group exploiting a previously unknown vulnerable driver to evade endpoint protection. The attackers used a Microsoft-signed WatchDog Antimalware driver to terminate protected processes on fully updated Windows systems. A dual-driver strategy ensured compatibility across Windows versions. Following disclosure, the vendor released a patched driver, but attackers quickly adapted by modifying it to bypass blocklists while preserving its valid signature. The campaign delivered ValleyRAT as the final payload, demonstrating sophisticated evasion techniques and highlighting the growing trend of weaponizing signed-but-vulnerable drivers to bypass security measures.

The security threat described involves an advanced persistent threat (APT) group known as Silver Fox exploiting a previously unknown vulnerability in a Microsoft-signed WatchDog Antimalware driver to evade endpoint protection on fully updated Windows systems. The attackers leveraged a dual-driver strategy to maintain compatibility across different Windows versions, enabling them to terminate protected processes that are typically guarded by endpoint detection and response (EDR) solutions. This exploitation of a signed but vulnerable driver is a sophisticated evasion technique, as the driver’s valid Microsoft signature allows it to bypass many security controls that rely on signature verification. After the vulnerability was disclosed and the vendor released a patched driver, the attackers adapted by modifying the driver to bypass blocklists while preserving its valid signature, demonstrating their agility and persistence. The final payload delivered by this campaign is ValleyRAT, a remote access trojan (RAT) known for stealthy operations and data exfiltration capabilities. The campaign highlights a growing trend in weaponizing signed vulnerable drivers (Bring Your Own Vulnerable Driver - BYOVD) to bypass security measures, including kernel-level protections, process termination prevention, and EDR solutions. The attack techniques include kernel exploitation, signature manipulation, process termination, and persistence mechanisms, as indicated by the associated MITRE ATT&CK techniques (e.g., T1218.011, T1055, T1562.002). This threat is particularly dangerous because it operates at the kernel level, undermining the integrity and availability of endpoint protection, and enabling attackers to maintain stealthy access to compromised systems.

Detailed information about Chasing the Silver Fox: Cat & Mouse in Kernel Shadows. Get real-time updates, technical details, and mitigation strategies.

Chasing the Silver Fox: Cat & Mouse in Kernel Shadows - Live Threat Intelligence - Threat Radar | OffSeq.com

Chasing the Silver Fox: Cat & Mouse in Kernel Shadows

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