Visual Basic Command Line Compiler Usage — Sigma Rule

Rule metadata and linked tags

Author: Ensar Şamil, @sblmsrsn, @oscd_initiative. Source status: test; severity: high. Source dates: 2020-10-07 / 2021-11-27.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0ae98263ac0d53d7c3e361e1b8b7dcf7ca0d482da84a0066d3f213d735221013

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: Visual Basic Command Line Compiler Usage
id: 7b10f171-7f04-47c7-9fa2-5be43c76e535
status: test
description: Detects successful code compilation via Visual Basic Command Line Compiler that utilizes Windows Resource to Object Converter.
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Vbc/
author: 'Ensar Şamil, @sblmsrsn, @oscd_initiative'
date: 2020-10-07
modified: 2021-11-27
tags:
    - attack.stealth
    - attack.t1027.004
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\vbc.exe'
        Image|endswith: '\cvtres.exe'
    condition: selection
falsepositives:
    - Utilization of this tool should not be seen in enterprise environment
level: high

Original YAML and metadata in JSON

False positives

• Utilization of this tool should not be seen in enterprise environment

Source references

• https://lolbas-project.github.io/lolbas/Binaries/Vbc/