Difference between revisions of "File Carving"

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Today most file carving programs will only recover files that are contiguous on the media.  
 
Today most file carving programs will only recover files that are contiguous on the media.  
  
DFRWS2006 featured a [http://www.dfrws.org/2006/challenge/index.html file carving challenge]. As a condition of entering the challenge, all tools and techniques developed to solve the challenge had to be open sourced.
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== File Carving challenges and test images ==
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[http://www.dfrws.org/2006/challenge/]
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File Carving Challenge - [[DFRWS]] 2006
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[http://dftt.sourceforge.net/test6/index.html]
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FAT Undelete Test #1 - Digital Forensics Tool Testing Image (dftt #6)
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[http://dftt.sourceforge.net/test7/index.html]
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NTFS Undelete (and leap year) Test #1 - Digital Forensics Tool Testing Image (dftt #7)
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[http://dftt.sourceforge.net/test11/index.html]
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Basic Data Carving Test - fat32 (by Nick Mikus) - Digital Forensics Tool Testing Image (dftt #11)
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[http://dftt.sourceforge.net/test12/index.html]
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Basic Data Carving Test - ext2 (by Nick Mikus) - Digital Forensics Tool Testing Image (dftt #12)
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==File Carving Bibliography==
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Mikus, Nicholas A. "An analysis of disc carving techniques," Master's Thesis, Naval Postgraduate School. March 2005. http://handle.dtic.mil/100.2/ADA432468
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== See also ==
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[[Tools:Data_Recovery#Carving | FIle Carving Tools]]
  
 
=Memory Carving=
 
=Memory Carving=

Revision as of 12:10, 13 February 2007

Carving is the practice of searching an input for files or other kinds of objects based on content, rather than on metadata. File carving is a powerful tool for recovering files and fragments of files when directory entries are corrupt or missing, as may be the case with old files that have been deleted or when performing an analysis on damaged media. Memory carving is a useful tool for analyzing physical and virtual memory dumps when the memory structures are unknown or have been overwritten.


Contents

File Carving

Most file carvers operate by looking for file headers and/or footers, and then "carving out" the blocks between these two boundaries. Semantic Carving performs carving based on an analysis of the contents of the proposed files.

File carving should be done on a disk image, rather than on the original disk.

File carving tools are listed on the Tools:Data_Recovery wiki page.

Many carving programs have an option to only look at or near sector boundaries where headers are found. However, searching the entire input can find files that have been embedded into other files, such as JPEGs being embedded into Microsoft Word documents. This may be considered an advantage or a disadvantage, depending on the circumstances.

Today most file carving programs will only recover files that are contiguous on the media.

File Carving challenges and test images

[1] File Carving Challenge - DFRWS 2006

[2] FAT Undelete Test #1 - Digital Forensics Tool Testing Image (dftt #6)

[3] NTFS Undelete (and leap year) Test #1 - Digital Forensics Tool Testing Image (dftt #7)

[4] Basic Data Carving Test - fat32 (by Nick Mikus) - Digital Forensics Tool Testing Image (dftt #11)

[5] Basic Data Carving Test - ext2 (by Nick Mikus) - Digital Forensics Tool Testing Image (dftt #12)

File Carving Bibliography

Mikus, Nicholas A. "An analysis of disc carving techniques," Master's Thesis, Naval Postgraduate School. March 2005. http://handle.dtic.mil/100.2/ADA432468

See also

FIle Carving Tools

Memory Carving