New File Association Using Exefile

Description

Detects the abuse of the exefile handler in new file association. Used for bypass of security products.

Query · sigma

selection:
  TargetObject|contains: Classes\.
  Details: exefile
condition: selection

Known false positives

  • Unknown
Raw source New File Association Using Exefile · Sigma
Esc
Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: New File Association Using Exefile
id: 44a22d59-b175-4f13-8c16-cbaef5b581ff
status: test
description: Detects the abuse of the exefile handler in new file association. Used for bypass of security products.
references:
    - https://twitter.com/mrd0x/status/1461041276514623491
author: Andreas Hunkeler (@Karneades)
date: 2021-11-19
modified: 2023-08-17
tags:
    - attack.stealth
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: 'Classes\.'
        Details: 'exefile'
    condition: selection
falsepositives:
    - Unknown
level: high

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.