AN1257: Analytic 1257
VMCI (Virtual Machine Communication Interface) traffic between guest and host, or between VMs, originating from non-management tools or unauthorized binaries.
Analyst context for executives and security teams
This analytic is about watching for unusual VMCI communication on ESXi: traffic between a guest and host, or between virtual machines, that comes from non-management tools or unauthorized binaries. For leaders, the practical issue is visibility inside virtualization infrastructure. If ESXi environments are business-critical, unapproved VM-to-host or VM-to-VM communication paths can become a blind spot for containment, investigation, and control assurance.
Executive priority
Prioritize this where ESXi supports critical workloads or regulated systems. The decision value is to confirm whether the organization can distinguish approved virtualization management activity from unauthorized VMCI use, and whether SOC and incident response teams have evidence to investigate guest-to-host or inter-VM communication. This supports operational resilience, audit defensibility, and virtualization security governance, especially because the ATT&CK object provides no built-in detection logic or tactic context.
Technical view
Validate whether ESXi environments expose telemetry that can identify VMCI traffic between guest and host or between VMs, and whether the originating process or binary can be classified as an approved management tool versus unauthorized software. Because no official detection logic is provided, teams should define local baselines for legitimate VMCI usage, approved administrative binaries, and expected management workflows before alerting on deviations.
Likely telemetry
- ESXi host logs and virtualization platform events relevant to VMCI communication
- Guest operating system process execution evidence where available
- Host or management-plane records identifying approved virtualization management tools
- Asset and software inventory for authorized binaries in ESXi-managed environments
- Inter-VM or guest-to-host communication records if collected by virtualization or monitoring tooling
Detection direction
- Confirm whether VMCI activity can be observed at all; lack of VMCI-specific logging is the primary coverage risk.
- Baseline approved management tools and expected VMCI communication patterns before treating non-management binaries as suspicious.
- Tune for unauthorized or unexpected binaries initiating VMCI traffic between guest and host or between VMs.
- Correlate VMCI observations with asset inventory and change records to reduce false positives from legitimate administration or tooling changes.
- Document detection assumptions because the ATT&CK object supplies no official detection pseudocode, no tactic mapping, and no relationship context.
Mitigation priorities
- Maintain an approved list of ESXi management tools and binaries permitted to use VMCI-related communication paths.
- Restrict administrative access and software installation paths that could introduce unauthorized binaries into ESXi-managed environments.
- Ensure virtualization logging, guest telemetry, and asset inventory are sufficient to support investigation of guest-host and inter-VM communication.
- Review ESXi security monitoring coverage as part of incident response readiness and compliance evidence collection for critical virtualized workloads.
Analyst notes and limits
This is a detection analytic object, not a technique description. The useful defensive question is whether the organization can prove what VMCI communication is normal and authorized in its ESXi estate. In many environments, the hardest part will be mapping VMCI traffic to an originating binary and separating legitimate management activity from unexpected tools.
The supplied ATT&CK fields are sparse: no official detection logic, no tactics, no relationships, and no external context beyond the MITRE reference. Local ESXi architecture, logging configuration, management tooling, and asset inventory are required to make this analytic operational.
Analytic 1257
VMCI (Virtual Machine Communication Interface) traffic between guest and host, or between VMs, originating from non-management tools or unauthorized binaries.
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
All related ATT&CK context
No relationships are available in the current normalized data for this object.
Object version and sync metadata
The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates .
Imported snapshots across ATT&CK releases (1)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.1 | 1.0 | Current bundle | 42f750a92dea… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
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[1]
mitre-attack AN1257Open source URL
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