PowerShell PSReflect Script

Last updated a month ago on 2026-02-09

Created 4 years ago on 2021-10-15

About

Detects PowerShell scripts that implements PSReflect-style helpers (for example, Add-Win32Type, New-InMemoryModule, or DllImport patterns) for dynamic Win32 API invocation. Attackers use PSReflect to call native APIs from PowerShell for execution, injection, or privilege manipulation.

Tags

Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: ExecutionData Source: PowerShell LogsLanguage: kuery

Severity

high

Risk Score

MITRE ATT&CK™

Execution (TA0002)(external, opens in a new tab or window)

↳ Command and Scripting Interpreter (T1059)(external, opens in a new tab or window)

↳ Native API (T1106)(external, opens in a new tab or window)

False Positive Examples

Legitimate PowerShell scripts that make use of PSReflect to access the win32 API

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type: Query (Kibana Query Language)
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: winlogbeat-*logs-windows.powershell*
Related Integrations: windows(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗event.category:process and host.os.type:windows and
  powershell.file.script_block_text:(
    "New-InMemoryModule" or
    "Add-Win32Type" or
    psenum or
    DefineDynamicAssembly or
    DefineDynamicModule or
    "Reflection.TypeAttributes" or
    "Reflection.Emit.OpCodes" or
    "Reflection.Emit.CustomAttributeBuilder" or
    "Runtime.InteropServices.DllImportAttribute"
  ) and
  not user.id : "S-1-5-18"

Install detection rules in Elastic Security

Detect PowerShell PSReflect Script in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).