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Adversaries may abuse Microsoft Office add-ins to obtain persistence on a compromised system.
Passed 22 of 23 test cases with the skill, and 18 of 23 without it.
and 2 more in the full report
4 fixed18 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
In the persistent XLL test script, what action is taken against the existing Excel Options registry key path before writing the new OPEN property?
| Checked | Without skill | With skill |
|---|---|---|
| The script removes the existing Excel Options registry path using Remove-Item before creating a clean directory. | Missed | Passed |
The instructions your model reads when the skill loads.
Sub-technique of: T1137
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. 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.
Add-ins can be used to obtain persistence because they can be set to execute code when an Office application starts.
Platforms: Windows, Office Suite
The following tests are from Atomic Red Team and provide actionable ways to test this technique:
Loads an XLL file using the excel add-ins library. This causes excel to launch Notepad.exe as a child process. This atomic test does not include persistent code execution as you would typically see when this is implemented in malware.
Supported Platforms: windows
$excelApp = New-Object -COMObject "Excel.Application"
if(-not $excelApp.path.contains("Program Files (x86)")){
test cases passed, vs 18 / 23 without
Published skills whose descriptions closely match this one, with their headline benchmark lift.
More skills from the same source and nearby in the registry, with their headline benchmark lift.