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[root@localhost evid]# ls -al /mnt/ext2/dd_Imagefullbin -rw-r--r-1 root root 6495068160 Apr 9 21:54 /mnt/ext2/dd_Imagefullbin
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The forensic image file dd_Imagefullbin appears to be a 6495GB file Generating an MD5 hash of this file ensures that this file is an exact duplicate of the original hard drive
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[root@localhost evid]# md5sum -b /mnt/ext2/dd_Imagefullbin b57be804f2fb945fba15d652c3770fd5 */mnt/ext2/dd_Imagefullbin
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Restoring the image to a new hard drive is very similar In this example, we have connected a new, wiped 6GB hard drive to the forensic workstation When we booted Linux, it was assigned the device name /dev/hdg (by now, you should have locked the original evidence in a security container) As a precaution, use the dmesg command to identify the hard drives connected to the workstation The following lines are an excerpt of the dmesg command s output
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hda: 30015216 sectors (15368 MB) w/2048KiB Cache, CHS=1868/255/63, UDMA(100) hdb: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=4865/255/63, UDMA(100) hdg: 12685680 sectors (6495 MB) w/420KiB Cache, CHS=13424/15/63, UDMA(33)
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You can see from this output that the operating system has detected three separate IDE hard drives: M I L /dev/hda This drive hosts the native operating system for the forensic workstation /dev/hdb /dev/hdg This drive is a 40GB storage drive to store forensic images This drive is the new drive, prepped for the restoration
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We are now ready to restore the forensic image to the new hard drive for analysis Use the cat command to concatenate the multiple segments of the forensic duplicate to the new hard drive, /dev/hdg
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[root@localhost ]# cat dd_Image1 dd_Image2 dd_Image3 dd_Image4 dd_Image5 dd_Image6 dd_Image7 > /dev/hdg [root@localhost ]# md5sum -b /dev/hdg b57be804f2fb945fba15d652c3770fd5 */dev/hdg
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Once again, we verify that the operation was completed accurately by using the md5sum command on the restored image The hashes match, proving that the duplication and restoration operations were successful If your destination hard drive has a different capacity than the original evidence drive, the MD5 hashes will not match If this occurs, you may need to compute hashes on the partitions rather than the entire drive The hashes on the original drive and the forensic duplicate should not be different
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Incident Response & Computer Forensics
Restoring a Qualified Forensic Duplication of a Hard Disk
Occasionally, you will need to restore a qualified duplicate in order to perform a more complete analysis When the source drive is damaged or has a strange file system format, the forensic processing suites will not be able to correctly interpret the data In some cases, you may need to exercise your keen data recovery skills to patch a malformed partition boot record Knowing how to transform a suspect s hard drive that is locked in a proprietary file format into a form that you can work with is an important skill As we discussed in the previous section, you will need to have a clean, wiped hard drive of equal or greater capacity Again, the destination drive needs to completely clear of any data before you restore any type of forensic duplicate
Restoring an EnCase Evidence File
Restoration of an EnCase evidence file to a clean hard drive is fairly simple Unfortunately, EnCase does not provide the means to convert their proprietary image file format to a true forensic image, as we will see in a few sections To begin the restoration process, you will need to create a new case Choose the File | New | New Case menu item Once the new case is created, you can add evidence files Select the first EnCase evidence file in the set, if you have a segmented image file EnCase will load the evidence and begin validating the hash values to ensure that the information has not changed since the evidence was acquired On the left side of the EnCase interface, you will see a list of hard drives that have been added to the case file To restore a drive, right click on the drive icon, as shown in Figure 11-1 This will pop up a list of the hard drives that EnCase recognizes as valid destinations for a restoration (Figure 11-2) In this example, we have a 120GB hard drive wiped and ready to receive the image The next dialog should be unnecessary, if you wiped the destination drive ahead of time If not, this will wipe the sectors at the end of the drive clean of any residual data Another option that may appear is Convert Drive Geometry Back in 7, we discussed some of the reasons why a restored image may not boot correctly This is due to different drive geometries between the source and the destination Remember that the partition tables are stored in cylinder / head / sector format If the drives are different, the tables will point to the wrong locations EnCase will alter the appropriate tables to match the new geometry Keep in mind that if you were to compute an MD5 of the restored drive, it would not match the original
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