FlagThis — Daily Cybersecurity Intelligence Briefing

Researchers from the University of Birmingham have identified a critical vulnerability chain termed the 'Download More RAM' attack, which targets the Windows Hypervisor. By exploiting memory mapping flaws and virtualization handlers, the attack executes primitives to bypass Virtualization-Based Security (VBS) and Hypervisor-Protected Code Integrity (HVCI). This bypass allows for kernel-mode privilege escalation, enabling the execution of scripts that manipulate the Windows registry to disable Microsoft Defender and other core security mechanisms. The attack effectively creates a systemic 'kill-switch,' neutralizing hardware-backed isolation and preventing standard security alerts from triggering during the defense-neutralization phase.