Sigma rule: Renamed Office Binary Execution

Rule

Title

Renamed Office Binary Execution

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2022-12-20

Modified

2025-12-09

File

rules/windows/process_creation/proc_creation_win_renamed_office_processes.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the execution of a renamed office binary

Log source

product

windows

category

process_creation

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_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.stealth
• attack.t1036.003

MITRE ATT&CK ids this rule names

• T1036.003

References

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

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_renamed_office_processes.yml