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Detection rules › Sigma

Windows Terminal Profile Settings Modification By Uncommon Process

Status
test
Severity
medium
Log source
product windows, category file_event
Author
frack113, Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects the creation or modification of the Windows Terminal Profile settings file "settings.json" by an uncommon process.

MITRE ATT&CK coverage

TacticTechniques
PersistenceT1547.015 Boot or Logon Autostart Execution: Login Items
Privilege EscalationT1547.015 Boot or Logon Autostart Execution: Login Items

Event coverage

ProviderEventTitle
SysmonEvent ID 11FileCreate

Rule body yaml

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Image|endswith:
        - '\cmd.exe'
        - '\cscript.exe'
        - '\mshta.exe'
        - '\powershell.exe'
        - '\pwsh.exe'
        - '\wscript.exe'
    TargetFilename|endswith: '\AppData\Local\Packages\Microsoft.WindowsTerminal_8wekyb3d8bbwe\LocalState\settings.json'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Imageends_with
  • \cmd.exe corpus 130 (sigma 130)
  • \cscript.exe corpus 73 (sigma 73)
  • \mshta.exe corpus 67 (sigma 67)
  • \powershell.exe corpus 182 (sigma 182)
  • \pwsh.exe corpus 168 (sigma 168)
  • \wscript.exe corpus 75 (sigma 75)
TargetFilenameends_with
  • \AppData\Local\Packages\Microsoft.WindowsTerminal_8wekyb3d8bbwe\LocalState\settings.json