Run PowerShell Script from ADS

Hunt Hypothesis

Detects PowerShell script execution from Alternate Data Stream (ADS)

Detection Rule

Sigma (Original)

title: Run PowerShell Script from ADS
id: 45a594aa-1fbd-4972-a809-ff5a99dd81b8
status: test
description: Detects PowerShell script execution from Alternate Data Stream (ADS)
references:
    - https://github.com/p0shkatz/Get-ADS/blob/1c3a3562e713c254edce1995a7d9879c687c7473/Get-ADS.ps1
author: Sergey Soldatov, Kaspersky Lab, oscd.community
date: 2019-10-30
modified: 2022-07-14
tags:
    - attack.stealth
    - attack.t1564.004
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith:
            - '\powershell.exe'
            - '\pwsh.exe'
        Image|endswith:
            - '\powershell.exe'
            - '\pwsh.exe'
        CommandLine|contains|all:
            - 'Get-Content'
            - '-Stream'
    condition: selection
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imProcessCreate
| where ((ParentProcessName endswith "\\powershell.exe" or ParentProcessName endswith "\\pwsh.exe") or (ActingProcessName endswith "\\powershell.exe" or ActingProcessName endswith "\\pwsh.exe")) and (TargetProcessName endswith "\\powershell.exe" or TargetProcessName endswith "\\pwsh.exe") and (TargetProcessCommandLine contains "Get-Content" and TargetProcessCommandLine contains "-Stream")

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Technique: T1564.004 — T1564.004

References

• https://github.com/p0shkatz/Get-ADS/blob/1c3a3562e713c254edce1995a7d9879c687c7473/Get-ADS.ps1
• SigmaHQ Rule