Computer System Reconnaissance Via Wmic.EXE — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2022-09-08 / 2023-02-14.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 3799003761bb7366d989f7be46acd0b1c42570ea14c819a37e21b3ec2c2b7faf

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: Computer System Reconnaissance Via Wmic.EXE
id: 9d7ca793-f6bd-471c-8d0f-11e68b2f0d2f
status: test
description: Detects execution of wmic utility with the "computersystem" flag in order to obtain information about the machine such as the domain, username, model, etc.
references:
    - https://www.microsoft.com/security/blog/2022/09/07/profiling-dev-0270-phosphorus-ransomware-operations/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-08
modified: 2023-02-14
tags:
    - attack.discovery
    - attack.execution
    - attack.t1047
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Image|endswith: '\wmic.exe'
        - OriginalFileName: 'wmic.exe'
    selection_cli:
        CommandLine|contains: 'computersystem'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_wmic_recon_computersystem/info.yml

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.microsoft.com/security/blog/2022/09/07/profiling-dev-0270-phosphorus-ransomware-operations/