Elastic Security Detection Rules

PowerShell PSReflect Script

Last updated 9 months ago on 2025-03-20
Created 4 years ago on 2021-10-15

About

Detects the use of PSReflect in PowerShell scripts. Attackers leverage PSReflect as a library that enables PowerShell to access win32 API functions.
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 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
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).