Difference between pages "Windows" and "Google Chrome"

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Google Chrome is a [[Web Browser|web browser]] developed by Google Inc.
  
'''Windows''' is a widely-spread [[operating system]] from [[Microsoft]].
+
== Configuration ==
 +
The Google Chrome configuration can be found in the '''Preferences''' file.
  
There are 2 main branches of Windows:
+
On Linux
* the DOS-branch: i.e. Windows 95, 98, ME
+
<pre>
* the NT-branch: i.e. Windows NT 4, XP, Vista
+
/home/$USER/.config/google-chrome/Default/Preferences
 +
</pre>
  
== Features ==
+
On MacOS-X
* Basic and Dynamic Disks, see: [http://msdn.microsoft.com/en-us/library/windows/desktop/aa363785(v=vs.85).aspx]
+
<pre>
 +
/Users/$USER/Library/Application Support/Google/Chrome/Default/Preferences
 +
</pre>
  
=== Introduced in Windows NT ===
+
On Windows XP
* [[NTFS]]
+
<pre>
 +
C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Default\Preferences
 +
</pre>
  
=== Introduced in Windows 2000 ===
+
On Windows Vista and later
 +
<pre>
 +
C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Preferences
 +
</pre>
  
=== Introduced in Windows XP ===
+
Or for '''Chromium'''
* [[Prefetch]]
+
* System Restore (Restore Points); also present in Windows ME
+
  
==== SP2 ====
+
On Linux
* Windows Firewall
+
<pre>
 +
/home/$USER/.config/chromium/Default/Preferences
 +
</pre>
  
=== Introduced in Windows Server 2003 ===
+
On MacOS-X
* Volume Shadow Copies
+
<pre>
 +
/Users/$USER/Library/Application Support/Chromium/Default/Preferences
 +
</pre>
  
=== Introduced in [[Windows Vista]] ===
+
On Windows XP
* [[BitLocker Disk Encryption | BitLocker]]
+
<pre>
* [[Windows Desktop Search | Search]] integrated in operating system
+
C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Chromium\User Data\Default\Preferences
* [[ReadyBoost]]
+
</pre>
* [[SuperFetch]]
+
* [[NTFS|Transactional NTFS (TxF)]]
+
* [[Windows NT Registry File (REGF)|Transactional Registry (TxR)]]
+
* [[Windows Shadow Volumes|Shadow Volumes]]; the volume-based storage of the Volume Shadow Copy data
+
* $Recycle.Bin
+
* [[Windows XML Event Log (EVTX)]]
+
* [[User Account Control (UAC)]]
+
  
=== Introduced in Windows Server 2008 ===
+
On Windows Vista and later
 +
<pre>
 +
C:\Users\%USERNAME%\AppData\Local\Chromium\User Data\Default\Preferences
 +
</pre>
  
=== Introduced in [[Windows 7]] ===
+
=== Plugins ===
* [[BitLocker Disk Encryption | BitLocker To Go]]
+
* [[Jump Lists]]
+
* [[Sticky Notes]]
+
  
=== Introduced in [[Windows 8]] ===
+
Information about plugins can be found under the "plugins section" of the Preferences file.
* [[Windows File History | File History]]
+
* [[Windows Storage Spaces | Storage Spaces]]
+
* [[Search Charm History]]
+
* [[Resilient File System (ReFS)]]; Was initially available in the Windows 8 server edition.
+
  
=== Introduced in Windows Server 2012 ===
+
=== DNS Prefetching ===
* [[Resilient File System (ReFS)]]
+
  
== Forensics ==
+
DNS is prefetched for related sites, e.g. links on the page.
 +
This behavior is controlled by the setting "Predict network actions to improve page load performance", which is enabled by default.
  
=== Partition layout ===
+
If enabled the Preferences file contains:
Default partition layout, first partition starts:
+
<pre>
* at sector 63 in Windows 2000, XP, 2003
+
  "dns_prefetching": {
* at sector 2048 in Windows Vista, 2008, 7
+
      "enabled": true,
 +
</pre>
  
=== Filesystems ===
+
If disabled the Preferences file contains:
* [[FAT]], [[FAT|exFAT]]
+
<pre>
* [[NTFS]]
+
  "dns_prefetching": {
* [[Resilient File System (ReFS) | ReFS]]
+
      "enabled": false,
 
+
</pre>
=== Recycle Bin ===
+
The Recycle Bin contains "Recycled" files. Moving files and directories to the Recycle Bin is also referred to as soft deletion, since the files are not removed from the file system.
+
  
==== RECYCLER ====
+
== Start-up DNS queries ==
The Recycler format is used by Windows 2000, XP.
+
  
Per user Recycle Bin folder in the form:
+
When Chrome starts it queries for several non-existing hostnames that consists of a 10 random characters, E.g.
 
<pre>
 
<pre>
C:\Recycler\%SID%\
+
ttrgoiknff.mydomain.com
 +
bxjhgftsyu.mydomain.com
 +
yokjbjiagd.mydomain.com
 
</pre>
 
</pre>
  
Which contains:
+
This is used to determine if your ISP is hijacking NXDOMAIN results [http://www.google.com/support/forum/p/Chrome/thread?tid=3511015c72a7b314&hl=en].
* INFO2 file; "Recycled" files metadata
+
  
==== $RECYCLE.BIN ====
+
== Disk Cache ==
The $Recycle.Bin is used as of Windows Vista.
+
Google Chrome uses multiple caches, from [http://src.chromium.org/viewvc/chrome/trunk/src/net/base/cache_type.h?view=markup]:
 
+
Per user Recycle Bin folder in the form:
+
 
<pre>
 
<pre>
C:\$Recycle.Bin\%SID%\
+
// The types of caches that can be created.
 +
enum CacheType {
 +
    DISK_CACHE,  // Disk is used as the backing storage.
 +
    MEMORY_CACHE,  // Data is stored only in memory.
 +
    MEDIA_CACHE,  // Optimized to handle media files.
 +
    APP_CACHE,  // Backing store for an AppCache.
 +
    SHADER_CACHE, // Backing store for the GL shader cache.
 +
    PNACL_CACHE, // Backing store the PNaCl translation cache
 +
};
 
</pre>
 
</pre>
  
Which contains:
+
The Google Chrome disk cache can be found in:
* $I files; "Recycled" file metadata
+
* $R files; the original data
+
  
=== Registry ===
+
On Linux
  
The [[Windows Registry]] is a database of keys and values that provides a wealth of information to forensic [[investigator]]s.
+
<pre>
 +
/home/$USER/.cache/google-chrome/Default/Cache/
 +
</pre>
  
=== Thumbs.db Files ===
+
<pre>
 +
/home/$USER/.cache/google-chrome/Default/Media Cache/
 +
</pre>
  
[[Thumbs.db]] files can be found on many Windows systems. They contain thumbnails of images or documents and can be of great value for the [[investigator]].
+
<pre>
 +
/home/$USER/.cache/google-chrome/Default/PnaclTranslationCache/
 +
</pre>
  
See also: [[Vista thumbcache]].
 
 
=== Browser Cache ===
 
 
=== Browser History ===
 
 
The [[Web Browser History]] files can contain significant information. The default [[Web browser|web browser]] that comes with Windows is [[Internet Explorer|Microsoft Internet Explorer]] but other common browsers on Windows are [[Apple Safari]], [[Google Chrome]], [[Mozilla Firefox]] and [[Opera]].
 
 
=== Search ===
 
See [[Windows Desktop Search]]
 
 
=== Setup API Logs ===
 
Windows Vista introduced several new [[Setup API Logs|Setup API Log files]].
 
 
Also see [http://support.microsoft.com/kb/927521].
 
 
=== Sleep/Hibernation ===
 
 
After (at least) Windows 7 recovers from sleep/hibernation there often is a system time change event (event id 1) in the event logs.
 
 
=== Users ===
 
Windows stores a users Security identifiers (SIDs) under the following registry key:
 
 
<pre>
 
<pre>
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
+
/home/$USER/.config/google-chrome/Default/Application Cache/Cache/
 
</pre>
 
</pre>
  
The %SID%\ProfileImagePath value should also contain the username.
 
 
=== Windows Error Reporting (WER) ===
 
 
As of Vista, for User Access Control (UAC) elevated applications WER reports can be found in:
 
 
<pre>
 
<pre>
C:\ProgramData\Microsoft\Windows\WER\
+
/home/$USER/.config/google-chrome/Default/Cache/
 
</pre>
 
</pre>
  
As of Vista, for non-UAC elevated applications (LUA) WER reports can be found in:
+
On MacOS-X
 
<pre>
 
<pre>
C:\Users\%UserName%\AppData\Local\Microsoft\Windows\WER\
+
/Users/$USER/Caches/Google/Chrome/Default/Cache/
 
</pre>
 
</pre>
  
Corresponding registry key:
+
On Windows XP
 
<pre>
 
<pre>
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Windows Error Reporting
+
C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Cache\
 
</pre>
 
</pre>
  
== Advanced Format (4KB Sector) Hard Drives ==
+
On Windows Vista and later
Windows XP does not natively handle drives that use the new standard of 4KB sectors. For information on this, see [[Advanced Format]].
+
 
+
== %SystemRoot% ==
+
The actual value of %SystemRoot% is store in the following registry value:
+
 
<pre>
 
<pre>
Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
+
C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Cache\
Value: SystemRoot
+
 
</pre>
 
</pre>
  
== See Also ==
+
The Chrome Cache contains different files with the following file names:
* [[Prefetch]]
+
* index
* [[Setup API Logs]]
+
* data_#; where # contains a decimal digit.
* [[SuperFetch]]
+
* f_######; where # contains a hexadecimal digit.
* [[Windows Application Compatibility]]
+
* [[Windows Desktop Search]]
+
* [[Windows Event Log (EVT)]]
+
* [[Windows XML Event Log (EVTX)]]
+
* [[Windows Vista]]
+
* [[Windows 7]]
+
* [[Windows 8]]
+
  
== External Links ==
+
For more info see Chrome developers site [http://www.chromium.org/developers/design-documents/network-stack/disk-cache].
  
* [http://en.wikipedia.org/wiki/Microsoft_Windows Wikipedia: Microsoft Windows]
+
== History ==
* [http://support.microsoft.com/kb/927521 Windows 7, Windows Server 2008 R2, and Windows Vista setup log file locations]
+
Chrome stores the history of visited sites in a file named '''History'''. This file uses the [[SQLite database format]].
* [http://www.forensicfocus.com/downloads/forensic-analysis-vista-recycle-bin.pdf The Forensic Analysis of the Microsoft Windows Vista Recycle Bin], by [[Mitchell Machor]], 2008
+
* [http://www.ericjhuber.com/2013/02/microsoft-file-system-tunneling.html?m=1 Microsoft Windows File System Tunneling], by [[Eric Huber]], February 24, 2013
+
* [http://www.nsa.gov/ia/_files/app/Spotting_the_Adversary_with_Windows_Event_Log_Monitoring.pdf Spotting the Adversary with Windows Event Log Monitoring], by National Security Agency/Central Security Service, February 28, 2013
+
* [http://www.swiftforensics.com/2014/04/search-history-on-windows-8-and-81.html Search history on Windows 8 and 8.1], by [[Yogesh Khatri's]], April 1, 2014
+
* [http://www.swiftforensics.com/2014/04/search-history-on-windows-81-part-2.html Search history on windows 8.1 - Part 2], by [[Yogesh Khatri's]], April 21, 2014
+
  
=== Recycle Bin ===
+
The '''History''' file can be found in same location as the '''Preferences''' file.
* [http://www.cybersecurityinstitute.biz/downloads/INFO2.pdf Lesson 3 – The Recycle Bin], by Steve Hailey
+
* [http://www.forensicfocus.com/downloads/forensic-analysis-vista-recycle-bin.pdf The Forensic Analysis of the Microsoft Windows Vista Recycle Bin], by Mitchell Machor, January 22, 2008
+
  
=== Malware/Rootkits ===
+
There is also '''Archived History''' that predates information in the '''History''' file.
* [http://forensicmethods.com/inside-windows-rootkits Inside Windows Rootkits], by [[Chad Tilbury]], September 4, 2013
+
Note that the '''Archived History''' only contains visits.
  
=== Program execution ===
+
=== Timestamps ===
* [http://windowsir.blogspot.com/2013/07/howto-determine-program-execution.html HowTo: Determine Program Execution], by [[Harlan Carvey]], July 06, 2013
+
The '''History''' file uses the different timestamps.
* [http://journeyintoir.blogspot.com/2014/01/it-is-all-about-program-execution.html It Is All About Program Execution], by [[Corey Harrell]], January 14, 2014
+
* [http://sysforensics.org/2014/01/know-your-windows-processes.html Know your Windows Processes or Die Trying], by [[Patrick Olsen]], January 18, 2014
+
  
=== Tracking removable media ===
+
==== visits.visit_time ====
* [http://www.swiftforensics.com/2012/08/tracking-usb-first-insertion-in-event.html Tracking USB First insertion in Event logs], by Yogesh Khatri, August 18, 2012
+
  
=== Under the hood ===
+
The '''visits.visit_time''' is in (the number of) microseconds since January 1, 1601 UTC
* [http://msdn.microsoft.com/en-us/library/windows/desktop/aa366533(v=vs.85).aspx MSDN: Comparing Memory Allocation Methods], by [[Microsoft]]
+
* [http://blogs.msdn.com/b/ntdebugging/archive/2007/06/28/how-windows-starts-up-part-the-second.aspx How Windows Starts Up (Part the second)]
+
* [http://msdn.microsoft.com/en-us/library/aa375142.aspx DLL/COM Redirection]
+
* [http://msdn.microsoft.com/en-us/library/windows/desktop/ms682586(v=vs.85).aspx Dynamic-Link Library Search Order]
+
* [http://blogs.msdn.com/b/junfeng/archive/2004/04/28/121871.aspx Image File Execution Options]
+
  
==== MSI ====
+
Some Python code to do the conversion into human readable format:
* [http://blogs.msdn.com/b/heaths/archive/2009/02/02/changes-to-package-caching-in-windows-installer-5-0.aspx?Redirected=true Changes to Package Caching in Windows Installer 5.0], by Heath Stewart, February 2, 2009
+
<pre>
* [http://blog.didierstevens.com/2013/07/26/msi-the-case-of-the-invalid-signature/ MSI: The Case Of The Invalid Signature], by Didier Stevens, July 26, 2013
+
date_string = datetime.datetime( 1601, 1, 1 )
 +
            + datetime.timedelta( microseconds=timestamp )
 +
</pre>
  
==== Side-by-side (WinSxS) ====
+
Note that this timestamp is not the same as a Windows filetime which is (the number of) 100 nanoseconds since January 1, 1601 UTC
* [http://en.wikipedia.org/wiki/Side-by-side_assembly Wikipedia: Side-by-side assembly]
+
* [http://msdn.microsoft.com/en-us/library/aa374224.aspx Assembly Searching Sequence]
+
* [http://blogs.msdn.com/b/junfeng/archive/2007/06/26/rt-manifest-resource-and-isolation-aware-enabled.aspx RT_MANIFEST resource, and ISOLATION_AWARE_ENABLED]
+
* [http://msdn.microsoft.com/en-us/library/windows/desktop/dd408052(v=vs.85).aspx Isolated Applications and Side-by-side Assemblies]
+
* [http://blogs.msdn.com/b/junfeng/archive/2006/01/24/517221.aspx#531208 DotLocal (.local) Dll Redirection], by [[Junfeng Zhang]], January 24, 2006
+
* [http://blogs.msdn.com/b/junfeng/archive/2006/04/14/576314.aspx Diagnosing SideBySide failures], by [[Junfeng Zhang]], April 14, 2006
+
* [http://omnicognate.wordpress.com/2009/10/05/winsxs/ EVERYTHING YOU NEVER WANTED TO KNOW ABOUT WINSXS]
+
* [http://www.fireeye.com/resources/pdfs/fireeye-dll-sideloading.pdf DLL Side-loading: A Thorn in the Side of the Anti-Virus Industry], by Amanda Stewart, April 2014
+
  
==== System Restore (Restore Points) ====
+
==== downloads.start_time ====
* [http://en.wikipedia.org/wiki/System_Restore Wikipedia: System Restore]
+
* [http://www.stevebunting.org/udpd4n6/forensics/restorepoints.htm Restore Point Forensics], by [[Steve Bunting]]
+
* [http://windowsir.blogspot.ch/2007/06/restore-point-analysis.html Restore Point Analysis], by [[Harlan Carvey]],  June 16, 2007
+
* [http://windowsir.blogspot.ch/2006/10/restore-point-forensics.html Restore Point Forensics], by [[Harlan Carvey]], October 20, 2006
+
* [http://www.ediscovery.co.nz/wip/srp.html System Restore Point Log Decoding]
+
  
==== Crash dumps ====
+
The '''downloads.start_time''' is in (the number of) seconds since January 1, 1970 UTC
* [http://blogs.technet.com/b/yongrhee/archive/2010/12/29/drwtsn32-on-windows-vista-windows-server-2008-windows-7-windows-server-2008-r2.aspx Technet: Drwtsn32 on Windows Vista/Windows Server 2008/Windows 7/Windows Server 2008 R2], by Yong Rhee, December 29, 2010
+
* [http://support.microsoft.com/kb/315263 MSDN: How to read the small memory dump file that is created by Windows if a crash occurs], by [[Microsoft]]
+
  
==== RPC ====
+
Some Python code to do the conversion into human readable format:
* [http://blogs.technet.com/b/networking/archive/2008/10/24/rpc-to-go-v-1.aspx RPC to Go v.1], by Michael Platts, October 24, 2008
+
<pre>
* [http://blogs.technet.com/b/networking/archive/2008/12/04/rpc-to-go-v-2.aspx RPC to Go v.2], by Michael Platts, December 4, 2008
+
date_string = datetime.datetime( 1970, 1, 1 )
 +
            + datetime.timedelta( seconds=timestamp )
 +
</pre>
  
==== User Account Control (UAC) ====
+
=== Example queries ===
* [http://blog.strategiccyber.com/2014/03/20/user-account-control-what-penetration-testers-should-know/ User Account Control – What Penetration Testers Should Know], by Raphael Mudge, March 20, 2014
+
Some example queries:
  
==== Windows Event Logs ====
+
To get an overview of the visited sites:
* [http://journeyintoir.blogspot.ch/2014/03/exploring-program-inventory-event-log.html Exploring the Program Inventory Event Log], by [[Corey Harrell]], March 24, 2014
+
<pre>
 +
SELECT datetime(((visits.visit_time/1000000)-11644473600), "unixepoch"), urls.url, urls.title FROM urls, visits WHERE urls.id = visits.url;
 +
</pre>
  
==== Windows Scripting Host ====
+
Note that the visit_time conversion looses precision.
* [https://www.mandiant.com/blog/ground-windows-scripting-host-wsh/ Going To Ground with The Windows Scripting Host (WSH)], by Devon Kerr, February 19, 2014
+
  
==== USB ====
+
To get an overview of the downloaded files:
* [https://blogs.sans.org/computer-forensics/files/2009/09/USBKEY-Guide.pdf USBKEY Guide], by [[SANS | SANS Institute - Digital Forensics and Incident Response]], September 2009
+
<pre>
* [https://blogs.sans.org/computer-forensics/files/2009/09/USB_Drive_Enclosure-Guide.pdf USB Drive Enclosure Guide], by [[SANS | SANS Institute - Digital Forensics and Incident Response]], September 2009
+
SELECT datetime(downloads.start_time, "unixepoch"), downloads.url, downloads.full_path, downloads.received_bytes, downloads.total_bytes FROM downloads;
 +
</pre>
  
==== WMI ====
+
How the information of the downloaded files is stored in the database can vary per version of Chrome as of version 26:
* [http://www.trendmicro.com/cloud-content/us/pdfs/security-intelligence/white-papers/wp__understanding-wmi-malware.pdf Understanding WMI Malware], by Julius Dizon, Lennard Galang, and Marvin Cruz, July 2010
+
<pre>
 +
SELECT datetime(((downloads.start_time/1000000)-11644473600), "unixepoch"), downloads.target_path, downloads_url_chains.url, downloads.received_bytes, downloads.total_bytes \
 +
FROM downloads, downloads_url_chains WHERE downloads.id = downloads_url_chains.id;
 +
</pre>
  
==== Windows Error Reporting (WER) ====
+
== See Also ==
* [http://blogs.technet.com/b/yongrhee/archive/2010/12/29/drwtsn32-on-windows-vista-windows-server-2008-windows-7-windows-server-2008-r2.aspx Drwtsn32 on Windows Vista/Windows Server 2008/Windows 7/Windows Server 2008 R2], by Yong Rhee, December 29, 2010
+
* [http://journeyintoir.blogspot.ch/2014/02/exploring-windows-error-reporting.html Exploring Windows Error Reporting], by [[Corey Harrell]], February 24, 2014
+
  
==== Windows Firewall ====
+
* [[SQLite database format]]
* [http://en.wikipedia.org/wiki/Windows_Firewall Wikipedia: Windows Firewall]
+
* [http://technet.microsoft.com/en-us/library/cc737845(v=ws.10).aspx#BKMK_log Windows Firewall Tools and Settings]
+
  
==== Windows 32-bit on Windows 64-bit (WoW64) ====
+
== External Links ==
* [http://en.wikipedia.org/wiki/WoW64 Wikipedia: WoW64]
+
* [http://en.wikipedia.org/wiki/Google_Chrome Wikipedia article on Google Chrome]
 +
* [http://www.chromium.org/user-experience/user-data-directory The Chromium Projects - User Data Directory]
 +
* [http://www.chromium.org/developers/design-documents/network-stack/disk-cache Chrome Disk Cache]
 +
* [http://www.google.com/support/forum/p/Chrome/thread?tid=3511015c72a7b314&hl=en Chrome support forum article random 10 character hostnames on startup]
 +
* [http://www.useragentstring.com/pages/Chrome/ Chrome User Agent strings]
 +
* [http://computer-forensics.sans.org/blog/2010/01/21/google-chrome-forensics/ Google Chrome Forensics] by [[Kristinn Guðjónsson]], January 21, 2010
 +
* [http://linuxsleuthing.blogspot.ch/2013/02/cashing-in-on-google-chrome-cache.html?m=1 Cashing in on the Google Chrome Cache], [[John Lehr]], February 24, 2013
 +
* [http://www.obsidianforensics.com/blog/history-index-files-removed-from-chrome/ History Index files removed from Chrome v30], by Ryan Benson, October 2, 2013
 +
* [https://hindsight-internet-history.googlecode.com/files/Evolution_of_Chrome_Databases.png Evolution of Chrome Databases], by Ryan Benson, November 12, 2013
  
=== Windows XP ===
+
== Tools ==
* [http://support.microsoft.com/kb/q308549 Description of Windows XP System Information (Msinfo32.exe) Tool]
+
=== Open Source ===
 +
* [https://code.google.com/p/hindsight-internet-history/ hindsight-internet-history]
  
[[Category:Operating systems]]
+
[[Category:Applications]]
[[Category:Windows]]
+
[[Category:Web Browsers]]

Revision as of 15:08, 29 April 2014

Google Chrome is a web browser developed by Google Inc.

Configuration

The Google Chrome configuration can be found in the Preferences file.

On Linux

/home/$USER/.config/google-chrome/Default/Preferences

On MacOS-X

/Users/$USER/Library/Application Support/Google/Chrome/Default/Preferences

On Windows XP

C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Default\Preferences

On Windows Vista and later

C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Preferences

Or for Chromium

On Linux

/home/$USER/.config/chromium/Default/Preferences

On MacOS-X

/Users/$USER/Library/Application Support/Chromium/Default/Preferences

On Windows XP

C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Chromium\User Data\Default\Preferences

On Windows Vista and later

C:\Users\%USERNAME%\AppData\Local\Chromium\User Data\Default\Preferences

Plugins

Information about plugins can be found under the "plugins section" of the Preferences file.

DNS Prefetching

DNS is prefetched for related sites, e.g. links on the page. This behavior is controlled by the setting "Predict network actions to improve page load performance", which is enabled by default.

If enabled the Preferences file contains:

   "dns_prefetching": {
      "enabled": true,

If disabled the Preferences file contains:

   "dns_prefetching": {
      "enabled": false,

Start-up DNS queries

When Chrome starts it queries for several non-existing hostnames that consists of a 10 random characters, E.g.

ttrgoiknff.mydomain.com
bxjhgftsyu.mydomain.com
yokjbjiagd.mydomain.com

This is used to determine if your ISP is hijacking NXDOMAIN results [1].

Disk Cache

Google Chrome uses multiple caches, from [2]:

// The types of caches that can be created.
enum CacheType {
    DISK_CACHE,  // Disk is used as the backing storage.
    MEMORY_CACHE,  // Data is stored only in memory.
    MEDIA_CACHE,  // Optimized to handle media files.
    APP_CACHE,  // Backing store for an AppCache.
    SHADER_CACHE, // Backing store for the GL shader cache.
    PNACL_CACHE, // Backing store the PNaCl translation cache
};

The Google Chrome disk cache can be found in:

On Linux

/home/$USER/.cache/google-chrome/Default/Cache/
/home/$USER/.cache/google-chrome/Default/Media Cache/
/home/$USER/.cache/google-chrome/Default/PnaclTranslationCache/
/home/$USER/.config/google-chrome/Default/Application Cache/Cache/
/home/$USER/.config/google-chrome/Default/Cache/

On MacOS-X

/Users/$USER/Caches/Google/Chrome/Default/Cache/

On Windows XP

C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Cache\

On Windows Vista and later

C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Cache\

The Chrome Cache contains different files with the following file names:

  • index
  • data_#; where # contains a decimal digit.
  • f_######; where # contains a hexadecimal digit.

For more info see Chrome developers site [3].

History

Chrome stores the history of visited sites in a file named History. This file uses the SQLite database format.

The History file can be found in same location as the Preferences file.

There is also Archived History that predates information in the History file. Note that the Archived History only contains visits.

Timestamps

The History file uses the different timestamps.

visits.visit_time

The visits.visit_time is in (the number of) microseconds since January 1, 1601 UTC

Some Python code to do the conversion into human readable format:

date_string = datetime.datetime( 1601, 1, 1 )
            + datetime.timedelta( microseconds=timestamp )

Note that this timestamp is not the same as a Windows filetime which is (the number of) 100 nanoseconds since January 1, 1601 UTC

downloads.start_time

The downloads.start_time is in (the number of) seconds since January 1, 1970 UTC

Some Python code to do the conversion into human readable format:

date_string = datetime.datetime( 1970, 1, 1 )
            + datetime.timedelta( seconds=timestamp )

Example queries

Some example queries:

To get an overview of the visited sites:

SELECT datetime(((visits.visit_time/1000000)-11644473600), "unixepoch"), urls.url, urls.title FROM urls, visits WHERE urls.id = visits.url;

Note that the visit_time conversion looses precision.

To get an overview of the downloaded files:

SELECT datetime(downloads.start_time, "unixepoch"), downloads.url, downloads.full_path, downloads.received_bytes, downloads.total_bytes FROM downloads;

How the information of the downloaded files is stored in the database can vary per version of Chrome as of version 26:

SELECT datetime(((downloads.start_time/1000000)-11644473600), "unixepoch"), downloads.target_path, downloads_url_chains.url, downloads.received_bytes, downloads.total_bytes \
FROM downloads, downloads_url_chains WHERE downloads.id = downloads_url_chains.id;

See Also

External Links

Tools

Open Source