Adversaries may abuse ESXi administration services to execute commands on guest machines hosted within an ESXi virtual environment. Persistent background services on ESXi-hosted VMs, such as the VMware Tools Daemon Service, allow for remote management from the ESXi server. The tools daemon service runs as vmtoolsd.exe on Windows guest operating systems, vmware-tools-daemon on macOS, and vmtoolsd on Linux.[1]

Adversaries may leverage a variety of tools to execute commands on ESXi-hosted VMs – for example, by using the vSphere Web Services SDK to programmatically execute commands and scripts via APIs such as StartProgramInGuest, ListProcessesInGuest, ListFileInGuest, and InitiateFileTransferFromGuest.[2],[3] This may enable follow-on behaviors on the guest VMs, such as File and Directory Discovery, Data from Local System, or OS Credential Dumping.

References

  1. Broadcom. (n.d.). VMware Tools Services. Retrieved March 28, 2025.
  2. Alexander Marvi, Brad Slaybaugh, Ron Craft, and Rufus Brown. (2023, June 13). VMware ESXi Zero-Day Used by Chinese Espionage Actor to Perform Privileged Guest Operations on Compromised Hypervisors. Retrieved March 26, 2025.
  3. Broadcom. (n.d.). Running Guest OS Operations. Retrieved March 28, 2025.

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