REGISTER_APP.VBS 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: c09c82116563e58e9db0113ae8e8ad5e1cb8566a7bb4591cf6849c5ccddbb838

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: REGISTER_APP.VBS Proxy Execution
id: 1c8774a0-44d4-4db0-91f8-e792359c70bd
status: test
description: Detects the use of a Microsoft signed script 'REGISTER_APP.VBS' to register a VSS/VDS Provider as a COM+ application.
references:
    - https://twitter.com/sblmsrsn/status/1456613494783160325?s=20
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-19
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - '\register_app.vbs'
            - '-register'
    condition: selection
falsepositives:
    - Legitimate usage of the script. Always investigate what's being registered to confirm if it's benign
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate usage of the script. Always investigate what's being registered to confirm if it's benign

Source references

• https://twitter.com/sblmsrsn/status/1456613494783160325?s=20