Difference between pages "Mounting Disk Images" and "File Carving"

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= FreeBSD =
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'''File carving''' is the practice of searching an input for files based on the input's content.  Most often the input is a [[disk image]], but it's possible (and sometimes practical) to carve individual files or [[physical memory]].
  
To mount a disk image on [[FreeBSD]]:
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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.
  
First attach the image to unit #1:
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Many carving programs have an option to only look at or near sector boundaries where headers are found. Searching the entire input can find files that have been embedded into other formats, such as [[JPEG]]s being embedded into [[Microsoft]] [[DOC|Word documents]].
  # mdconfig -a -t vnode -f /big3/project/images/img/67.img -u 1
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Then mount:
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  # mount -t msdos /dev/md1s1 /mnt
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  # ls /mnt
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  BOOTLOG.PRV    BOOTLOG.TXT    COMMAND.COM    IO.SYS          MSDOS.SYS
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To unmount:
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  # umount /mnt
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  # mdconfig -d -u 1
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To mount the image read-only, use:
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  # mdconfig -o readonly -a -t vnode -f /big3/project/images/img/67.img -u 1
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  # mount -o ro -t msdos /dev/md1s1 /mnt
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= Linux =
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==To mount a disk image on [[Linux]]==
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# mount -t vfat -o loop,ro,noexec img.dd /mnt
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The '''''ro''''' is for read-only.
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This will mount NSRL ISOs:
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  # mount /home/simsong/RDS_218_A.iso /mnt/nsrl -t iso9660 -o loop,ro,noexec
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Some raw images contains multiple partitions (e.g. full HD image). In this case, it's necessary to specify a starting offset for each partition.
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# mount -t vfat -o loop,offset=32256,ro,noexec img.dd /mnt/tmp_1
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# mount -t vfat -o loop,offset=20974464000,ro,noexec img.dd /mnt/tmp_2
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===kpartx===
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Mounting raw images with multiple partitions is easy with ''kpartx''. Type ''aptitude install kpartx'' as root to install ''kpartx'' under Debian. ''kpartx'' is creating device-mappings for each partition. If the raw image looks like this:
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        Device        Boot      Start      End      Blocks Id  System
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    rawimage.dd1              1          1        8001  83  Linux
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    rawimage.dd2              2          2        8032+  5  Extended
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    rawimage.dd5              2          2        8001  83  Linux
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The command
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#  kpartx -v -a rawimage.dd
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creates these mappings
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    /dev/mapper/loop0p1
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    /dev/mapper/loop0p2
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    /dev/mapper/loop0p5
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The partitions can be mounted with these commands:
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# mount /dev/mapper/loop0p1 /media/suspectHD_01/ -o ro
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# mount /dev/mapper/loop0p5 /media/suspectHD_02/ -o ro
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Don't forget the switch '''''-o ro''''' !
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==To unmount==
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# umount /mnt
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== Mounting Images Using Alternate Superblocks ==
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* [http://sansforensics.wordpress.com/2008/12/18/mounting-images-using-alternate-superblocks/ Mounting Images Using Alternate Superblocks]
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= Windows =
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MS Windows does not include a native means for mounting acquired images.  However, there are tools available for mounting acquired images on Windows systems.
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== Free Tools ==
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* [http://accessdata.com/support/adownloads#FTKImager FTK Imager v.3.0]
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* [http://www.ltr-data.se/opencode.html#ImDisk ImDisk] - also on [http://en.wikipedia.org/wiki/ImDisk WikiPedia]
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* Paraben's [http://www.paraben-forensics.com/catalog/product_info.php?cPath=25&products_id=268 P2 Explorer]
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* [http://www.vmxbuilder.com/vdk-gui/ VDKWin], requires [http://chitchat.at.infoseek.co.jp/vmware/vdk.html VDK]
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* [http://archive.msdn.microsoft.com/vhdtool vhdtool] - an unsupported MS tool that you can use to convert a raw/dd image to a VHD file and mount as a read-only volume via Disk Manager
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== Commercial Tools ==
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* [http://www.asrdata.com/SmartMount/ SmartMount]
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* [http://www.mountimage.com/ Mount Image Pro] - has a 14-day trial version
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[[Category:Howtos]]
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Revision as of 15:53, 12 June 2006

File carving is the practice of searching an input for files based on the input's content. Most often the input is a disk image, but it's possible (and sometimes practical) to carve individual files or physical memory.

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.

Many carving programs have an option to only look at or near sector boundaries where headers are found. Searching the entire input can find files that have been embedded into other formats, such as JPEGs being embedded into Microsoft Word documents.