Microsoft Word Add-In Loaded

Detects Microsoft Word loading an Add-In (.wll) file which can be used by threat actors for initial access or persistence.

title: Microsoft Word Add-In Loaded
id: 1337afba-d17d-4d23-bd55-29b927603b30
status: test
description: |
    Detects Microsoft Word loading an Add-In (.wll) file which can be used by threat actors for initial access or persistence.
references:
    - https://labs.withsecure.com/publications/add-in-opportunities-for-office-persistence
    - https://nored0x.github.io/red-teaming/office-persistence/#what-is-a-wll-file
author: Steffen Rogge (dr0pd34d)
date: 2024-07-10
tags:
    - attack.execution
    - attack.t1204.002
    - detection.threat-hunting
logsource:
    category: image_load
    product: windows
detection:
    selection:
        Image|endswith: '\winword.exe'
        ImageLoaded|endswith: '.wll'
    condition: selection
falsepositives:
    - The rules is only looking for ".wll" loads. So some false positives are expected with legitimate and allowed WLLs.
level: low

• T1204.002Malicious File

• https://labs.withsecure.com/publications/add-in-opportunities-for-office-persistence↗
• https://nored0x.github.io/red-teaming/office-persistence/#what-is-a-wll-file↗