Renamed Office Binary Execution — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-12-20 / 2025-12-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: e0d13615ffcba73e255afd40c6e1ab1954feef473d9db237ed2a135301903497

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: Renamed Office Binary Execution
id: 0b0cd537-fc77-4e6e-a973-e53495c1083d
status: test
description: Detects the execution of a renamed office binary
references:
    - https://infosec.exchange/@sbousseaden/109542254124022664
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-12-20
modified: 2025-12-09
tags:
    - attack.stealth
    - attack.t1036.003
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - OriginalFileName:
              - 'Excel.exe'
              - 'MSACCESS.EXE'
              - 'MSPUB.EXE'
              - 'OneNote.exe'
              - 'OneNoteM.exe'
              - 'OUTLOOK.EXE'
              - 'POWERPNT.EXE'
              - 'WinWord.exe'
              - 'Olk.exe'
        - Description:
              - 'Microsoft Access'
              - 'Microsoft Excel'
              - 'Microsoft OneNote'
              - 'Microsoft Outlook'
              - 'Microsoft PowerPoint'
              - 'Microsoft Publisher'
              - 'Microsoft Word'
              - 'Sent to OneNote Tool'
    filter_main_legit_names:
        Image|endswith:
            - '\EXCEL.exe'
            - '\excelcnv.exe'
            - '\MSACCESS.exe'
            - '\MSPUB.EXE'
            - '\ONENOTE.EXE'
            - '\ONENOTEM.EXE'
            - '\OUTLOOK.EXE'
            - '\POWERPNT.EXE'
            - '\WINWORD.exe'
            - '\OLK.EXE'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://infosec.exchange/@sbousseaden/109542254124022664