<div class="block-paragraph_advanced"><p>Written by: Stuart Carrera</p> <hr/></div> <div class="block-paragraph_advanced"><h3><span style="vertical-align: baseline;">Introduction</span><strong style="vertical-align: baseline;"> </strong></h3> <p><span style="vertical-align: baseline;">Building on </span><a href="https://cloud.google.com/blog/topics/threat-intelligence/brickstorm-espionage-campaign?e=48754805"><span style="text-decoration: underline; vertical-align: baseline;">recent BRICKSTORM research</span></a><span style="vertical-align: baseline;"> from Google Threat Intelligence Group (GTIG), this post explores the evolving threats facing virtualized environments. These operations directly target the VMware vSphere ecosystem, specifically the vCenter Server Appliance (VCSA) and ESXi hypervisors. To help organizations stay ahead of these risks, we will focus on the essential hardening strategies and mitigating controls necessary to secure these critical assets.</span></p> <p><span style="vertical-align: baseline;">By establishing persistence at the virtualization layer, threat actors operate beneath the guest operating system where traditional security protections are ineffective. This strategy takes advantage of a significant visibility gap, as these control planes do not support standard endpoint detection and response (EDR) agents and have historically received less security focus than traditional endpoints.</span></p> <p><span style="vertical-align: baseline;">This activity is not the result of a security vulnerability in vendors' products or infrastructure. Instead, these intrusions rely on the effectiveness of exploiting weak security architecture and identity design, a lack of host-based configuration enforcement, and limited visibility within the virtualization layer. By operating within these unmonitored areas, attackers can establish long-term persistence and gain administrative control over the entire vSphere environment.</span></p></div> <div class="

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