Renamed Vmnat.exe Execution — Sigma Rule

Rule metadata and linked tags

Author: elhoim. Source status: test; severity: high. Source dates: 2022-09-09 / 2023-02-03.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 1cbd26c7915cec35fbb3b27bf8e137ef3799919661775255b30d6e0921377a45

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Renamed Vmnat.exe Execution
id: 7b4f794b-590a-4ad4-ba18-7964a2832205
status: test
description: Detects renamed vmnat.exe or portable version that can be used for DLL side-loading
references:
    - https://twitter.com/malmoeb/status/1525901219247845376
author: elhoim
date: 2022-09-09
modified: 2023-02-03
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        OriginalFileName: 'vmnat.exe'
    filter_rename:
        Image|endswith: 'vmnat.exe'
    condition: selection and not 1 of filter_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://twitter.com/malmoeb/status/1525901219247845376