README.md

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 Remotal 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;
  • 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

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 with Windows SDK 17763 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)

Authors

(c) 2019 WDEXTRACT Project