Import PowerShell Modules From Suspicious Directories — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2022-07-07 / 2023-01-10.

{
  "product": "windows",
  "category": "ps_script",
  "definition": "Requirements: Script Block Logging must be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2ea8a1757da1f5d801a19ffddac4f9365e953064ef2f5ddbcf2bf19f1cf3c945

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: Import PowerShell Modules From Suspicious Directories
id: 21f9162c-5f5d-4b01-89a8-b705bd7d10ab
related:
    - id: c31364f7-8be6-4b77-8483-dd2b5a7b69a3
      type: similar
status: test
description: Detects powershell scripts that import modules from suspicious directories
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1003.002/T1003.002.md
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-07
modified: 2023-01-10
tags:
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - 'Import-Module "$Env:Temp\'
            - Import-Module '$Env:Temp\
            - 'Import-Module $Env:Temp\'
            - 'Import-Module "$Env:Appdata\'
            - Import-Module '$Env:Appdata\
            - 'Import-Module $Env:Appdata\'
            - 'Import-Module C:\Users\Public\'
            # Import-Module alias is "ipmo"
            - 'ipmo "$Env:Temp\'
            - ipmo '$Env:Temp\
            - 'ipmo $Env:Temp\'
            - 'ipmo "$Env:Appdata\'
            - ipmo '$Env:Appdata\
            - 'ipmo $Env:Appdata\'
            - 'ipmo C:\Users\Public\'
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1003.002/T1003.002.md