Potential In-Memory Execution Using Reflection.Assembly

Description

Detects usage of "Reflection.Assembly" load functions to dynamically load assemblies in memory

Query · sigma

selection:
  ScriptBlockText|contains: '[Reflection.Assembly]::load'
condition: selection

Known false positives

  • Legitimate use of the library
Raw source Potential In-Memory Execution Using Reflection.Assembly · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Potential In-Memory Execution Using Reflection.Assembly
id: ddcd88cb-7f62-4ce5-86f9-1704190feb0a
status: test
description: Detects usage of "Reflection.Assembly" load functions to dynamically load assemblies in memory
references:
    - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=50
author: frack113
date: 2022-12-25
tags:
    - attack.stealth
    - attack.t1620
logsource:
    product: windows
    category: ps_script
    definition: Script Block Logging must be enable
detection:
    selection:
        ScriptBlockText|contains: '[Reflection.Assembly]::load'
    condition: selection
falsepositives:
    - Legitimate use of the library
level: medium

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