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hackers-grep

hackers-grep is a tool that enables you to search for strings in PE files. The tool is capable of searching strings, imports, exports, and public symbols (like woah) using regular expressions.

I have used this tool to find functionality across Windows that I want to investigate further. It has allowed me to answer questions like "How many libraries process XML?".

It's also fun to poke around with.

Installation

  1. Install comtypes (https://pypi.python.org/pypi/comtypes)
  2. Install pywin32 (http://sourceforge.net/projects/pywin32/files/pywin32/)
  3. Install Microsoft debugging symbols (https://msdn.microsoft.com/en-us/windows/hardware/gg463028.aspx)

Usage

The options for hackers-grep are listed below. Keep in mind that all regular expression strings should use pythons "re" module sytax and are case insensitive. For more information please see https://docs.python.org/2/library/re.html.

Z:\hackers-grep>hackers-grep.py -h
Usage: hackers-grep.py [options] <search path> <file regex> <string regex>

Options:
  -h, --help            show this help message and exit
  -d MAX_DEPTH, --max-depth=MAX_DEPTH
                        Maximum directory recursion depth (default: 1)
  -x, --exports-only    Only search Export section strings
  -n, --imports-only    Only search Import section strings
  -a, --all-the-things  Search strings, import, exports
  -s, --symbols         Include symbols in search
  -p SYMBOL_PATH, --symbol-path=SYMBOL_PATH
                        Symbol path (default: C:\Windows\Symbols)
  -e EXPORT_FILTER, --export-filter=EXPORT_FILTER
                        Search modules matching this Export regex
  -i IMPORT_FILTER, --import-filter=IMPORT_FILTER
                        Search modules matching this Import regex
  -f, --show-info       Display file details size and modification time
  -v, --verbose         Verbose output

Examples

Search for every dll that imports wininet!InternetOpen

This example demonstrates how to search imports. It will search C:\Windows\System32 for any file ending in .dll that imports InternetOpenA or InternetOpenW.

Z:\hackers-grep>hackers-grep.py -n c:\windows\system32 .*.dll "InternetOpen[A,W]"
c:\windows\system32\msidcrl30.dll  WININET.dll!InternetOpenA
c:\windows\system32\msscp.dll      WININET.dll!InternetOpenA
c:\windows\system32\mssign32.dll   WININET.dll!InternetOpenA
c:\windows\system32\msnetobj.dll   WININET.dll!InternetOpenA
c:\windows\system32\oleprn.dll     WININET.dll!InternetOpenW
c:\windows\system32\urlmon.dll     WININET.dll!InternetOpenW
c:\windows\system32\winethc.dll    WININET.dll!InternetOpenW
c:\windows\system32\wuwebv.dll     WININET.dll!InternetOpenW

By using the option "-f" we can also print information about the file, including the useful "File description" property.

Z:\hackers-grep>hackers-grep.py -f -n c:\windows\system32 .*.dll "InternetOpen[A,W]"
c:\windows\system32\msidcrl30.dll  [ 468 KB] [07/14/2009] [Microsoft Corporation] [IDCRL Dynamic Link Library] WININET.dll!InternetOpenA
c:\windows\system32\msscp.dll      [ 492 KB] [02/03/2015] [Microsoft Corporation] [Windows Media Secure Content Provider] WININET.dll!InternetOpenA
c:\windows\system32\mssign32.dll   [  38 KB] [07/14/2009] [Microsoft Corporation] [Microsoft Trust Signing APIs] WININET.dll!InternetOpenA
c:\windows\system32\msnetobj.dll   [ 259 KB] [02/03/2015] [Microsoft Corporation] [DRM ActiveX Network Object]  WININET.dll!InternetOpenA
c:\windows\system32\oleprn.dll     [ 104 KB] [07/14/2009] [Microsoft Corporation] [Oleprn DLL]    WININET.dll!InternetOpenW
c:\windows\system32\urlmon.dll     [1280 KB] [07/16/2015] [Microsoft Corporation] [OLE32 Extensions for Win32]   WININET.dll!InternetOpenW
c:\windows\system32\winethc.dll    [  81 KB] [07/14/2009] [Microsoft Corporation] [WinInet Helper Class]  WININET.dll!InternetOpenW
c:\windows\system32\wuwebv.dll     [ 169 KB] [07/20/2015] [Microsoft Corporation] [Windows Update Vista Web Control] WININET.dll!InternetOpenW

Search for every dll that exports DllGetClassObject

This example demonstrates how to search exports. It will search C:\Windows\System32 for any file ending in .dll that exports the OLE function DllGetClassObject

Z:\hackers-grep>hackers-grep.py -x c:\windows\system32 .*.dll DllGetClassObject
c:\windows\system32\accessibilitycpl.dll  <export>!DllGetClassObject
c:\windows\system32\ActionCenterCPL.dll   <export>!DllGetClassObject
c:\windows\system32\activeds.dll          <export>!DllGetClassObject
c:\windows\system32\AdmTmpl.dll           <export>!DllGetClassObject
c:\windows\system32\adsldp.dll            <export>!DllGetClassObject
c:\windows\system32\adsmsext.dll          <export>!DllGetClassObject
c:\windows\system32\amstream.dll          <export>!DllGetClassObject
...

Search for every occurrence of the string "xmlns"

This example will search C:\Windows\System32 for every occurance of the string "xmlns" in a dll.

Z:\hackers-grep>hackers-grep.py c:\windows\system32 .*.dll xmlns.*
...
c:\windows\system32\mscms.dll        xmlns:wcs='http://schemas.microsoft.com/windows/2005/02/color/WcsCommonProfileTypes'
c:\windows\system32\mscms.dll        xmlns:gmm='http://schemas.microsoft.com/windows/2005/02/color/GamutMapModel'
c:\windows\system32\mscms.dll        xmlns:cam='http://schemas.microsoft.com/windows/2005/02/color/ColorAppearanceModel'
<snip>
c:\windows\system32\msmpeg2vdec.dll  xmlns:c
c:\windows\system32\msmpeg2vdec.dll  xmlns:c
c:\windows\system32\mstscax.dll      xmlns:psf='http://schemas.microsoft.com/windows/2003/08/printing/printschemaframework'
c:\windows\system32\mstscax.dll      xmlns:psf='http://schemas.microsoft.com/windows/2003/08/printing/printschemaframework'
<snip>
c:\windows\system32\wlanpref.dll     xmlns:p='http://www.microsoft.com/networking/WLAN/profile/v1' xmlns:wps='http://www.microsoft.com/networking/WPSSettings/v1'
c:\windows\system32\wlanpref.dll     xmlns:p='http://www.microsoft.com/networking/WLAN/profile/v1' xmlns:wps='http://www.microsoft.com/networking/WPSSettings/v1'
c:\windows\system32\WlanMM.dll       xmlns:an='http://www.microsoft.com/AvailableNetwork/Info'
c:\windows\system32\WlanMM.dll       xmlns:an='http://www.microsoft.com/AvailableNetwork/Info'
<snip>

Search for every RPC server that also imports CreateFile

This example shows how to use the import filter "-i" option. In this case, we want to find any dll that imports CreateFile, but filter only those that import RpcServerListen as well.

Z:\hackers-grep>hackers-grep.py -n -i RpcServerListen c:\windows\system32 .*.dll CreateFile
c:\windows\system32\authui.dll    KERNEL32.dll!CreateFileW
c:\windows\system32\certprop.dll  KERNEL32.dll!CreateFileW
c:\windows\system32\FXSAPI.dll    KERNEL32.dll!CreateFileW
c:\windows\system32\FXSAPI.dll    KERNEL32.dll!CreateFileMappingW
c:\windows\system32\bthserv.dll   KERNEL32.dll!CreateFileW
c:\windows\system32\iscsiexe.dll  KERNEL32.dll!CreateFileW
c:\windows\system32\msdtcprx.dll  KERNEL32.dll!CreateFileW
c:\windows\system32\RpcEpMap.dll  API-MS-Win-Core-File-L1-1-0.dll!CreateFileW
c:\windows\system32\rpcss.dll     KERNEL32.dll!CreateFileMappingW
c:\windows\system32\bdesvc.dll    KERNEL32.dll!CreateFileW
c:\windows\system32\SCardSvr.dll  KERNEL32.dll!CreateFileW
c:\windows\system32\tapisrv.dll   KERNEL32.dll!CreateFileMappingW
c:\windows\system32\tapisrv.dll   KERNEL32.dll!CreateFileW
c:\windows\system32\termsrv.dll   KERNEL32.dll!CreateFileW
c:\windows\system32\wbiosrvc.dll  API-MS-Win-Core-File-L1-1-0.dll!CreateFileW
c:\windows\system32\wiaservc.dll  KERNEL32.dll!CreateFileW
c:\windows\system32\wiaservc.dll  KERNEL32.dll!CreateFileMappingW
c:\windows\system32\tbssvc.dll    KERNEL32.dll!CreateFileA
c:\windows\system32\wscsvc.dll    KERNEL32.dll!CreateFileW
c:\windows\system32\wscsvc.dll    KERNEL32.dll!CreateFileMappingW
c:\windows\system32\rdpcore.dll   KERNEL32.dll!CreateFileW
c:\windows\system32\wlansvc.dll   KERNEL32.dll!CreateFileW
c:\windows\system32\wwansvc.dll   KERNEL32.dll!CreateFileW

Search symbols like a boss

This example shows my favorite use of hackers-grep. The ability to combine some of the previously shown features and the verbose symbol information makes this a nice tool for finding that next bug :)

In this example we want to use debugging symbols (.pdb) to search for every occurance of hfont.

Z:\hackers-grep>hackers-grep.py -s c:\windows\system32 .*.dll ".*HFONT.*"
c:\windows\system32\advpack.dll          struct HFONT__ * g_hFont
c:\windows\system32\advpack.dll          struct HFONT__ * g_hFont
<snip>
c:\windows\system32\dxtrans.dll          public: virtual long __stdcall CDXTLabel::GetFontHandle(struct HFONT__ * *)
c:\windows\system32\dxtrans.dll          public: virtual long __stdcall CDXTLabel::SetFontHandle(struct HFONT__ *)
c:\windows\system32\dxtrans.dll          public: virtual long __stdcall CDX2D::GetFont(struct HFONT__ * *)
c:\windows\system32\dxtrans.dll          public: virtual long __stdcall CDX2D::SetFont(struct HFONT__ *)
c:\windows\system32\dxtrans.dll          public: virtual long __stdcall CDXTLabel::GetFontHandle(struct HFONT__ * *)
c:\windows\system32\dxtrans.dll          public: virtual long __stdcall CDXTLabel::SetFontHandle(struct HFONT__ *)
c:\windows\system32\dxtrans.dll          public: virtual long __stdcall CDX2D::GetFont(struct HFONT__ * *)
c:\windows\system32\dxtrans.dll          public: virtual long __stdcall CDX2D::SetFont(struct HFONT__ *)
<snip>
c:\windows\system32\XpsGdiConverter.dll  protected: void __thiscall std::list<struct std::pair<struct tagLOGFONTW cons
t ,class std::tr1::shared_ptr<struct xgc::GDIResource<struct HFONT__ *> > >,class std::allocator<struct std::pair<struct
 tagLOGFONTW const ,class std::tr1::shared_ptr<struct xgc::GDIResource<struct HFONT__ *> > > > >::_Incsize(unsigned int)
c:\windows\system32\XpsGdiConverter.dll  public: virtual void * __thiscall std::tr1::_Ref_count<struct xgc::GDIResourc
e<struct HFONT__ *> >::`vector deleting destructor'(unsigned int)
<snip>

This example searches symbols for IStream::Read

Z:\hackers-grep>hackers-grep.py -s c:\windows\system32 .*.dll ".*IStream::Read.*"
c:\windows\system32\apss.dll      public: virtual long __stdcall CStream::CImpIStream::Read(void *,unsigned long,unsigned long *)
c:\windows\system32\apss.dll      public: virtual long __stdcall CStream::CImpIStream::Read(void *,unsigned long,unsigned long *)
c:\windows\system32\avifil32.dll  public: virtual long __stdcall CPrxAVIStream::Read(long,long,void *,long,long *,long *)
c:\windows\system32\avifil32.dll  public: virtual long __stdcall CPrxAVIStream::ReadFormat(long,void *,long *)
c:\windows\system32\avifil32.dll  public: virtual long __stdcall CPrxAVIStream::ReadData(unsigned long,void *,long *)
c:\windows\system32\avifil32.dll  public: virtual long __stdcall CPrxAVIStream::Read(long,long,void *,long,long *,long *)
c:\windows\system32\avifil32.dll  public: virtual long __stdcall CPrxAVIStream::ReadFormat(long,void *,long *)
c:\windows\system32\avifil32.dll  public: virtual long __stdcall CPrxAVIStream::ReadData(unsigned long,void *,long *)
c:\windows\system32\cdosys.dll    public: virtual long __stdcall CMMIStream::Read(void *,unsigned long,unsigned long *)
c:\windows\system32\cdosys.dll    public: virtual long __stdcall MemIStream::Read(void *,unsigned long,unsigned long *)
c:\windows\system32\cdosys.dll    public: virtual long __stdcall CMMIStream::Read(void *,unsigned long,unsigned long *)
c:\windows\system32\cdosys.dll    public: virtual long __stdcall MemIStream::Read(void *,unsigned long,unsigned long *)
c:\windows\system32\imapi2fs.dll  CFsiStream::Read
c:\windows\system32\imapi2fs.dll  CFsiStream::Read
<snip>

Known issues

Its written in Python, so it can be slow, especially if you try and search the entire system drive while processing symbols

About

hackers-grep is a utility to search for strings in PE executables including imports, exports, and debug symbols

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