Wfc.exe

Execute arbitrary C# code embedded in a XOML file.

Use Execute proxied payload with Microsoft signed binary to bypass WDAC policies

wfc.exe {PATH_ABSOLUTE:.xoml}

Context

user

Native

AWL Bypass

MITRE

T1127

Detection

BlockRule: docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules

Sigma: github.com/SigmaHQ/sigma/blob/6b34764215b0e97e32cbc4c6325fc933d2695c3a/rules/windows/process_creation/proc_creation_win_lolbin_wfc.yml

IOC: As a Windows SDK binary, execution on a system may be suspicious

Refs

bohops.com/2020/11/02/exploring-the-wdac-microsoft-recommended-block-rules-part-ii-wfc-fsi/

lolbas-project.github.io/lolbas/OtherMSBinaries/Wfc/