Launch-VsDevShell.PS1 Proxy Execution — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2022-08-19 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: bb7a04a594d5cebad37b9841d69ce35e93ccb65222b36cb71328bd188aee9c1b

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: Launch-VsDevShell.PS1 Proxy Execution
id: 45d3a03d-f441-458c-8883-df101a3bb146
status: test
description: Detects the use of the 'Launch-VsDevShell.ps1' Microsoft signed script to execute commands.
references:
    - https://twitter.com/nas_bench/status/1535981653239255040
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-19
tags:
    - attack.stealth
    - attack.t1216.001
logsource:
    category: process_creation
    product: windows
detection:
    selection_script:
        CommandLine|contains: 'Launch-VsDevShell.ps1'
    selection_flags:
        CommandLine|contains:
            - 'VsWherePath '
            - 'VsInstallationPath '
    condition: all of selection_*
falsepositives:
    - Legitimate usage of the script by a developer
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate usage of the script by a developer

Source references

• https://twitter.com/nas_bench/status/1535981653239255040