Library / Windows

hcsdiag.exe

Hyper-V Host Compute Service Diagnostics Tool · Microsoft Corporation

WindowsParsed

OriginalFilename

Hyper-V Host Compute Service Diagnostics Tool

Differs from file name

Gotchas

OriginalFilename doesn't match the file name: a rule using OriginalFileName: hcsdiag.exe never fires.

Query snippets

logsource:
  category: process_creation
  product: windows
detection:
  selection:
    - Image|endswith: '\hcsdiag.exe'
    - OriginalFileName: 'Hyper-V Host Compute Service Diagnostics Tool'
  condition: selection

process_creation logsource. Sigma string matching is case-insensitive.

| tstats summariesonly=false count values(Processes.original_file_name) as original_file_name
    from datamodel=Endpoint.Processes
    where (Processes.original_file_name="Hyper-V Host Compute Service Diagnostics Tool" OR Processes.process_name="hcsdiag.exe")
    by Processes.dest Processes.process_name Processes.process_path Processes.process
| rename Processes.* as *

Endpoint.Processes data model. On raw Sysmon events the field is OriginalFileName.

DeviceProcessEvents
| where ProcessVersionInfoOriginalFileName in~ ("Hyper-V Host Compute Service Diagnostics Tool")
    or FileName =~ "hcsdiag.exe"

Microsoft Defender XDR advanced hunting. in~ and =~ are case-insensitive.

process where event.type == "start" and
  (process.pe.original_file_name in~ ("Hyper-V Host Compute Service Diagnostics Tool") or
   process.name : "hcsdiag.exe")

ECS process.pe.original_file_name is a keyword field: in~ is case-insensitive, Kibana KQL is not.

['hyper-v host compute service diagnostics tool'].includes(String(OriginalFileName || '').toLowerCase())

Filter expression (JavaScript) for events carrying Sysmon's OriginalFileName field.

Values across builds

OriginalFilename	Builds	Arch	File version	Windows releases	Source	Sysmon
Hyper-V Host Compute Service Diagnostics Tool	1	x64	10.0.26100.9278		Host scan

OriginalFilename

Builds

Arch

File version

Windows releases

Source

Sysmon

Hyper-V Host Compute Service Diagnostics Tool

x64

10.0.26100.9278

Host scan

InternalName: Hyper-V Host Compute Service Diagnostics Tool · Product: Microsoft® Windows® Operating System

All 1 parsed builds

SHA256	Version	Arch	OriginalFilename	Windows releases	Signature	Source	Sysmon
9b2d905361f0…	10.0.26100.9278	x64	Hyper-V Host Compute Service Diagnostics Tool			Host scan

SHA256

Version

Arch

OriginalFilename

Windows releases

Signature

Source

Sysmon

9b2d905361f0…

10.0.26100.9278

x64

Hyper-V Host Compute Service Diagnostics Tool

Host scan

Winbindex builds link to the Microsoft symbol server copy that was hashed and parsed.