Elastic Security Detection Rules

PowerShell PSReflect Script

Last updated 9 days ago on 2026-05-03
Created 5 years ago on 2021-10-15

About

Detects PowerShell script block content containing PSReflect-style helper indicators, such as Add-Win32Type, New-InMemoryModule, or DllImport patterns, that may support dynamic Win32 API invocation from PowerShell.
Tags
Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: ExecutionData Source: PowerShell LogsLanguage: kuery
Severity
high
Risk Score
73
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 PSReflect use when reconstructed content, imported API set, script origin, launcher, user/host scope, and same-host effects align with an approved workflow
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
logs-windows.powershell*winlogbeat-*
Related Integrations

windows(external, opens in a new tab or window)

Query
text code block:
event.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).