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An old idea that still holds true: Fight the enemy where they aren’t. Threat actors take this advice to heart by avoiding Endpoint Detection and Response solutions and targeting systems that do not generally support EDR such as VMware ESXi hosts.

We’re currently reading Google’s reporting on VMware ESXi Zero-Day Used by Chinese Espionage Actor to Perform Privileged Guest Operations on Compromised Hypervisors cloud.google.com/blog/topics/...

One of the big updates for ATT&CK v17 was the new platform ESXi which reflects the rise in attacks on virtualization infrastructure. The technique we’re spotlighting today is new to ATT&CK: T1675 ESXi Administration Command attack.mitre.org/techniques/T...

T1675 describes activity in which an adversary abuses ESXi admin services to execute commands on guest machines.

Google’s reporting details UNC3886, Chinese cyber espionage group, using a zero-day vulnerability that enabled the execution of privileged commands across guest virtual machines without authentication of guest credentials from a compromised ESXi host and no default logging on guest VMs.