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Attack: Office Application Startup: Add-ins

Adversaries may abuse Microsoft Office add-ins to obtain persistence on a compromised system. Office add-ins can be used to add functionality to Office programs. (Citation: Microsoft Office Add-ins) There are different types of add-ins that can be used by the various Office products; including Word/Excel add-in Libraries (WLL/XLL), VBA add-ins, Office Component Object Model (COM) add-ins, automation add-ins, VBA Editor (VBE), Visual Studio Tools for Office (VSTO) add-ins, and Outlook add-ins. (Citation: MRWLabs Office Persistence Add-ins)(Citation: FireEye Mail CDS 2018)

Add-ins can be used to obtain persistence because they can be set to execute code when an Office application starts.

MITRE

Tactic

technique

Test : Persistent Code Execution Via Excel VBA Add-in File (XLAM)

OS

Description:

Creates an Excel VBA Add-in file (XLAM) which runs automatically when Excel is started The sample XLAM provided launches the notepad as a proof-of-concept for persistent execution from Office.

Executor

powershell

Sigma Rule

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