Difference between revisions of "Vista thumbcache"

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== Overview ==
 
== Overview ==
  
[[Windows]] Vista stores [[Thumbnails | thumbnails]] in the following directory: ''\Users\\AppData\Local\Microsoft\Windows\Explorer''
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[[Windows]] Vista stores [[Thumbnails | thumbnails]] in the following directory:
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<pre>
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\Users\%username%\AppData\Local\Microsoft\Windows\Explorer
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</pre>
  
 
This directory contains following files:
 
This directory contains following files:
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* thumbcache_sr.db
 
* thumbcache_sr.db
  
Thumbnails are stored in ''thumbcache_NN.db'' files in different formats (e.g. [[BMP]]) and can be extracted using [[File Carving | file carving]]. There are several tools that can work with Vista Thumbcache: [http://www.dmthumbs.com/ dmThumbs], [http://www.janusware.com/fetch.php?page=412,2 Thumbs.db Viewer], [http://www.simplecarver.com/tool.php?toolname=WinThumbs%20Extractor WinThumbs] and [[FTK]]. Unfortunately, there is no information in the thumbcache that can easily link thumbnails with original files in all cases. One of the ways to link thumbnails with original files is to use Windows Indexer (Windows.edb) database.
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Thumbnails are stored in ''thumbcache_NN.db'' files in different formats (e.g. [[BMP]]) and can be extracted using [[File Carving | file carving]]. There are several tools that can work with Vista Thumbcache: [http://www.dmthumbs.com/ dmThumbs], [http://www.janusware.com/fetch.php?page=412,2 Thumbs.db Viewer], [http://www.simplecarver.com/tool.php?toolname=WinThumbs%20Extractor WinThumbs], [http://code.google.com/p/thumbcache-viewer thumbcache-viewer], and [[FTK]]. Unfortunately, there is no information in the thumbcache that can easily link thumbnails with original files in all cases. One of the ways to link thumbnails with original files is to use Windows Indexer (Windows.edb) database.
  
 
== Thumbcache Format ==
 
== Thumbcache Format ==
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==== Using Windows PowerShell ====
 
==== Using Windows PowerShell ====
  
Windows PowerShell provides easy way to access this database using SQL queries. Note that most forensic tools (like [[FTK]]) display ''ThumbnailCacheID'' ([[FTK]] calls it ''Thumbnail filename'') in hexademical, but Windows PowerShell returns the result in decimal.
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Windows PowerShell provides easy way to access this database using SQL queries. Note that most forensic tools (like [[FTK]]) display ''ThumbnailCacheID'' ([[FTK]] calls it ''Thumbnail filename'') in hexadecimal, but Windows PowerShell returns the result in decimal.
  
 
==== Using HEX editor ====
 
==== Using HEX editor ====
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== External Links ==
 
== External Links ==
 
 
* [http://www.whereisyourdata.co.uk/data/modules/wfdownloads/visit.php?cid=4&lid=9 Forensic Implications of Windows Vista, Barrie Stewart, 2007]
 
* [http://www.whereisyourdata.co.uk/data/modules/wfdownloads/visit.php?cid=4&lid=9 Forensic Implications of Windows Vista, Barrie Stewart, 2007]
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* [http://code.google.com/p/libwtcdb/downloads/detail?name=Windows%20Explorer%20Thumbnail%20Cache%20database%20format.pdf Windows Explorer Thumbnail Cache database (thumbcache.db) format], by the [[libwtcdb|libwtcdb project]]
  
=== Non-English ===
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=== ThumbnailCacheId ===
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* [http://msdn.microsoft.com/en-us/library/windows/desktop/bb787580(v=vs.85).aspx System.ThumbnailCacheId]
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* [http://msdn.microsoft.com/en-us/library/bb774628(VS.85).aspx IThumbnailCache interface]
  
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=== Non-English ===
 
* [http://itdefence.ru/content/articles/Thumbnails.Suhanov/ Использование централизованных баз данных эскизов для исследования графических файлов на зашифрованных разделах], ITDefence, 2009 ([http://www.securitylab.ru/analytics/370474.php extended version])
 
* [http://itdefence.ru/content/articles/Thumbnails.Suhanov/ Использование централизованных баз данных эскизов для исследования графических файлов на зашифрованных разделах], ITDefence, 2009 ([http://www.securitylab.ru/analytics/370474.php extended version])
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== Tools ==
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* [http://code.google.com/p/thumbcache-viewer/ Thumbcache-viewer]

Revision as of 05:31, 3 June 2014

Overview

Windows Vista stores thumbnails in the following directory:

\Users\%username%\AppData\Local\Microsoft\Windows\Explorer

This directory contains following files:

  • thumbcache_idx.db
  • thumbcache_32.db, thumbcache_96.db, thumbcache_256.db, and thumbcache_1024.db
  • thumbcache_sr.db

Thumbnails are stored in thumbcache_NN.db files in different formats (e.g. BMP) and can be extracted using file carving. There are several tools that can work with Vista Thumbcache: dmThumbs, Thumbs.db Viewer, WinThumbs, thumbcache-viewer, and FTK. Unfortunately, there is no information in the thumbcache that can easily link thumbnails with original files in all cases. One of the ways to link thumbnails with original files is to use Windows Indexer (Windows.edb) database.

Thumbcache Format

Thumbcache format is described here.

In general, every thumbnail in cache is associated with two 64-bit variables. First variable (sometimes called Unique ID, Secret, File ID) associates data in file thumbcache_idx.db with thumbnail data in thumbcache_NN.db files; the purpose of this variable is unclear. Another variable is Thumbnail Cache ID (sometimes called Thumbnail filename (in FTK), File Ref) is used to link thumbnails with original files. Actually, Thumbnail Cache ID is represented as Unicode string of HEX encoding.

Thumbnail Creation Process

Windows Vista creates thumbnails for files on different media types, including:

Windows Vista doesn't create thumbnails for files encrypted using EFS unless thumbcache directory is encrypted too; Windows Vista doesn't delete thumbnails for files after they were encrypted using EFS.

Some programs may generate thumbnails for some file types which are displayed in Windows Explorer, but not stored in the thumbcache (e.g. Ascon Kompas).

Linking thumbnails with original files

Using Windows Indexer

Windows PowerShell displays association between files and ThumbnailCacheIDs

One way to link thumbnails with original files is to use Windows Indexer database, which stores association between indexed files and ThumbnailCacheIDs with some metadata. The windows.edb database file contents can be extracted using Windows Search Index Extractor

Using Windows PowerShell

Windows PowerShell provides easy way to access this database using SQL queries. Note that most forensic tools (like FTK) display ThumbnailCacheID (FTK calls it Thumbnail filename) in hexadecimal, but Windows PowerShell returns the result in decimal.

Using HEX editor

You can also search for ThumbnailCacheID value in Windows.edb file using your favorite HEX editor.

Vista Windows Photo Gallery

Windows Vista includes a built-in picture previewing tool called Windows Photo Gallery (the LIVE edition may also be installed by the user). Both of these programs create the files pictures.pd4 and pictures.pd5 respectively containing the ThumbnailCacheID and file path information of previewed pictures and videos. The contents of the pictures.pd4 and pictures.pd5 can be extracted using WPG Viewer

External Links

ThumbnailCacheId

Non-English

Tools