Windows Terminal Profile Settings Modification By Uncommon Process — Sigma Rule

Rule metadata and linked tags

Author: frack113, Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-07-22 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 9ef90cea05217bc4b84e2f184b7d6d54d15ca1ce20c262fdf725752a4d7adc93

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: Windows Terminal Profile Settings Modification By Uncommon Process
id: 9b64de98-9db3-4033-bd7a-f51430105f00
status: test
description: Detects the creation or modification of the Windows Terminal Profile settings file "settings.json" by an uncommon process.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/74438b0237d141ee9c99747976447dc884cb1a39/atomics/T1547.015/T1547.015.md#atomic-test-1---persistence-by-modifying-windows-terminal-profile
    - https://twitter.com/nas_bench/status/1550836225652686848
author: frack113, Nasreddine Bencherchali (Nextron Systems)
date: 2023-07-22
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.t1547.015
logsource:
    product: windows
    category: file_event
detection:
    selection:
        Image|endswith:
            # Note: Add other potential common applications
            - '\cmd.exe'
            - '\cscript.exe'
            - '\mshta.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\wscript.exe'
        TargetFilename|endswith: '\AppData\Local\Packages\Microsoft.WindowsTerminal_8wekyb3d8bbwe\LocalState\settings.json'
    condition: selection
falsepositives:
    - Some false positives may occur with admin scripts that set WT settings.
level: medium

Original YAML and metadata in JSON

False positives

• Some false positives may occur with admin scripts that set WT settings.

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/74438b0237d141ee9c99747976447dc884cb1a39/atomics/T1547.015/T1547.015.md#atomic-test-1---persistence-by-modifying-windows-terminal-profile
• https://twitter.com/nas_bench/status/1550836225652686848