DLL Side-Loading for Fun (and Profit?) - Day 7

Posted: - Updated: - Category: security - Tags: side-loading

TL;DR: see Part 1 for an introduction to this series and an overview of the available posts.

To continue with the leaders in security information and event management we can use the FWInstCheck.exe tool included in the McAfee Endpoint Security product to side-load our own code.

  • Name: McAfee Endpoint Security (x64)
  • Executable: FWInstCheck.exe
  • SHA256: 1ea5f32debb79f98c23918e8c246eddab323b2760696abbeafaf30c454c39982
  • SHA1: fe00e9375ac7fb3ca90ae7ed3fcd9670a3575409
  • MD5: a872d5f425658524b7dbc8972f670042
  • Certificate: McAfee, Inc./VeriSign Class 3 Code Signing 2010 CA/VeriSign Class 3 Public Primary Certification Authority - G5

DLL-Template:

; ***************************************************************************
; *                                                                         *
; * Author:      marpie (marpie@a12d404.net)                                *
; * License:     BSD 2-clause                                               *
; * Copyright:   (c) 2019, a12d404.net                                      *
; * Status:      Prototype                                                  *
; * Created:     20190107                                                   *
; * Last Update: 20190107                                                   *
; *                                                                         *
; ***************************************************************************
EnableExplicit

; ---------------------------------------------------------------------------
;- Prototypes
Macro LoopForever()
  Sleep_(-1)
EndMacro

Macro DbgOutFunctionName()
  OutputDebugString_("Func: " + #PB_Compiler_Procedure)
EndMacro

Macro DummyExport(proc_name)
  ProcedureDLL proc_name()
    DbgOutFunctionName()
    LoopForever()
  EndProcedure
EndMacro

; ---------------------------------------------------------------------------
;- Exports: cryptbase.dll - FWInstCheck.exe (McAfee Firewall Installer check exe)

DummyExport(SystemFunction001)
DummyExport(SystemFunction002)
DummyExport(SystemFunction003)
DummyExport(SystemFunction004)
DummyExport(SystemFunction005)
DummyExport(SystemFunction028)
DummyExport(SystemFunction029)
DummyExport(SystemFunction034)
DummyExport(SystemFunction036)
DummyExport(SystemFunction040)
DummyExport(SystemFunction041)

; ---------------------------------------------------------------------------

DummyExport(AttachProcess) ; -- just to block on AttachProcess...

ProcedureDLL DetachProcess(Instance)
  DbgOutFunctionName()
EndProcedure

ProcedureDLL AttachThread(Instance)
  DbgOutFunctionName()
EndProcedure

ProcedureDLL DetachThread(Instance)
  DbgOutFunctionName()
EndProcedure

Download: I do not provide the executables in question as they can easily be found on the Internet and I don’t want any eager companies to send me DMCA take-down letters ;-). Hybrid Analysis / reverse.it or VirusTotal are always happy to help with downloads for these files…

A description of all executables will be collected on Github: signed-loaders