PowerShell Script Run in AppData — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro, oscd.community. Source status: test; severity: medium. Source dates: 2019-01-09 / 2022-07-14.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 91f7609837eff365d7ba7bef626275eca7e577e14cb4ae7493ea5b6de24dba17

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: PowerShell Script Run in AppData
id: ac175779-025a-4f12-98b0-acdaeb77ea85
status: test
description: Detects a suspicious command line execution that invokes PowerShell with reference to an AppData folder
references:
    - https://twitter.com/JohnLaTwC/status/1082851155481288706
    - https://app.any.run/tasks/f87f1c4e-47e2-4c46-9cf4-31454c06ce03
author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro, oscd.community
date: 2019-01-09
modified: 2022-07-14
tags:
    - attack.execution
    - attack.t1059.001
logsource:
    category: process_creation
    product: windows
detection:
    selection1:
        CommandLine|contains:
            - 'powershell.exe'
            - '\powershell'
            - '\pwsh'
            - 'pwsh.exe'
    selection2:
        CommandLine|contains|all:
            - '/c '
            - '\AppData\'
        CommandLine|contains:
            - 'Local\'
            - 'Roaming\'
    condition: all of selection*
falsepositives:
    - Administrative scripts
level: medium

Original YAML and metadata in JSON

False positives

• Administrative scripts

Source references

• https://twitter.com/JohnLaTwC/status/1082851155481288706
• https://app.any.run/tasks/f87f1c4e-47e2-4c46-9cf4-31454c06ce03