Potential Arbitrary DLL Load Using Winword — Sigma Rule

Rule metadata and linked tags

Author: Victor Sergeev, oscd.community. Source status: test; severity: medium. Source dates: 2020-10-09 / 2023-03-29.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 1f71873b63d6ea37071ef289d7e52e5aed5e65b87f8e70b2d84454753548e2ba

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Potential Arbitrary DLL Load Using Winword
id: f7375e28-5c14-432f-b8d1-1db26c832df3
related:
    - id: 2621b3a6-3840-4810-ac14-a02426086171
      type: obsolete
status: test
description: Detects potential DLL sideloading using the Microsoft Office winword process via the '/l' flag.
references:
    - https://github.com/D4Vinci/One-Lin3r/blob/9fdfa5f0b9c698dfbd4cdfe7d2473192777ae1c6/one_lin3r/core/liners/windows/cmd/dll_loader_word.py
author: Victor Sergeev, oscd.community
date: 2020-10-09
modified: 2023-03-29
tags:
    - attack.stealth
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\WINWORD.exe'
        - OriginalFileName: 'WinWord.exe'
    selection_dll:
        CommandLine|contains|all:
            - '/l '
            - '.dll'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/D4Vinci/One-Lin3r/blob/9fdfa5f0b9c698dfbd4cdfe7d2473192777ae1c6/one_lin3r/core/liners/windows/cmd/dll_loader_word.py