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Computer ForensicsDr. Randy M. Kaplan
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Browser Forensics
A Source of Evidence
Critical Evidence can often be found in a subject’s browsing historyEmailsSites visited Internet searches
Computer Forensics
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Browsers
Two are dominant IEMozilla (and its derivatives and variants)
Computer Forensics
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IE
Activity stored in –C:\Documents and Settings\user\Local Settings\
Temporary Internet Files\Content.IE5
ContainsCached pagesImages
Two other files of interestHistory without locally cached content
C:\Documents and Settings\user\History\History.IE5Cookies
C:\Documents and Settings\user\Cookies
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Index.dat
In each of these directories there is a file named index.dat
The relationship between cached web content and URLs is maintained in this file
Computer Forensics
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Mozilla
Web activity maintained in a file named history.dat
File located in –C:\Documents and Settings\user\Application Data\
Mozilla\Firefox\Profiles\<random text>\history.datC:\Documents and Settings\user\Application Data\
Mozilla\Profiles\<profile name>\<random text>\history.dat
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Mozilla
history.dat differs from IE
Does not link web site activity to cached web pages
More difficult to reconstruct the activity
Computer Forensics
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Tools
Web HistorianA tool used to reconstruct web activityApplicable to –
IE Mozilla Firefox Netscape Safari Opera
Computer Forensics
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Downloading Web Historian
Web Historian can be downloaded from –http://www.download.com/Red-Cliff-Web-Historian/
3000-2653_4-10373157.html
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Web Historian
Computer Forensics
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Web Historian
Computer Forensics
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Web Historian
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Lots and lost of information produced by Web Historian
Web Historian
Suppose my wife wanted to know what I have been doing on the Internet
(Maybe she wants to make sure I am not spending the kid’s college fund)
What evidence in the generated file would give her the kinds of information she is looking for?
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Web Historian
Scan the URL addresses
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Web Historian
Scan the URL addresses
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Trying Firefox
Set WH to Firefox directory
What are the results?
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Trying Firefox
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Trying Firefox
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Very odd because this is mydefault browser
Web Historian
Not really clear why WH does not work with Firefox
Try alternative
Computer Forensics
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Cache View
Cache View can be downloaded from –http://progsoc.org/~timj/cv/
Computer Forensics
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Cache View
Download and install
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Cache View
Need to point Cache View to the proper directory
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Cache View
Point to the proper directory
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Cache View
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Cache View
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Cache View
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How To Use?
Clearly having a record of someone’s web activities can be used to determine what they have doing
For example if a subject was interested in learning how to hack a particular system then accessing web sites to learn how to do this would substantiate this theory
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How To Use?
If a subject uses a web interface for email then we can tell if he accessed it and we can also see what the status of the access was at that time
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