WDExtract

Extract Windows Defender database from vdm files and unpack it

This program distributed as-is, without any warranty;
No official support, if you like this tool, feel free to contribute.

Features

Unpack VDM containers of Windows Defender/Microsoft Security Essentials;
Decrypt VDM container embedded in Malicious software Removal Tool (MRT.exe);
Extract all PE images from unpacked/decrypted containers on the fly (-e switch):
- dump VDLLs (Virtual DLLs);
- dump VFS (Virtual File System) contents;
- dump signatures auxiliary images;
- dump GAPA (Generic Application Level Protocol Analyzer) images used by NIS (Network Inspection System);
- code can be adapted to dump type specific chunks of database (not implemented);
Faster than any script.

List of MRT extracted images, (version 5.71.15840.1) https://gist.githubusercontent.com/hfiref0x/e4b97fb7135c9a6f9f0787c07da0a99d/raw/d91e77f71aa96bdb98d121b1d915dc697ce85e2a/gistfile1.txt

List of WD extracted images, mpasbase.vdm (version 1.291.0.0) https://gist.githubusercontent.com/hfiref0x/38e7845304d10c284220461c86491bdf/raw/39c999e59ff2a924932fe6db811555161596b4a7/gistfile1.txt

List of NIS signatures from NisBase.vdm (version 119.0.0.0) https://gist.githubusercontent.com/hfiref0x/e9b3f185032fcd2afb31afe7bc9a05bd/raw/9bd9f9cc7c408acaff7b56b810c8597756d55d14/nis_sig.txt

Usage

wdextract file [-e]

file - filename of VDM container (*.vdm file or MRT.exe executable);
-e optional parameter, extract all found PE image chunks found in VDM after unpacking/decrypting (this including VFS components and emulator VDLLs).

Example:

wdextract c:\wdbase\mpasbase.vdm
wdextract c:\wdbase\mpasbase.vdm -e
wdextract c:\wdbase\mrt.exe
wdextract c:\wdbase\mrt.exe -e

Note: base will be unpacked/decrypted to source directory as %originalname%.extracted (e.g. if original file c:\wdbase\mpasbase.vdm, unpacked will be c:\wdbase\mpasbase.vdm.extracted). Image chunks will be dumped to created "chunks" directory in the wdextract current directory (e.g. if wdextract run from c:\wdbase it will be c:\wdbase\chunks directory). Output files always overwrite existing.

Build

Source code written in C;
Built with MSVS 2017/2019 with Windows SDK 17763/18362 installed;
Can be built with previous versions of MSVS and SDK's.

Related references and tools

PowerShell unpack script for packed VDM containers, https://gist.github.com/mattifestation/3af5a472e11b7e135273e71cb5fed866
Windows Defender Emulator Tools, https://github.com/0xAlexei/WindowsDefenderTools
Porting Windows Dynamic Link Libraries to Linux, https://github.com/taviso/loadlibrary
MpEnum, https://github.com/hfiref0x/MpEnum
libmpclient, https://github.com/UldisRinkevichs/libmpclient

N.B.

No actual dumped/extracted/unpacked binary data included or will be included in this repository.

3rd party code usage

Uses ZLIB Data Compression Library (https://github.com/madler/zlib)

hfiref0x/WDExtract