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Using TASK to Recover Deleted Files
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TASK is an open-source forensic toolkit used to analyze Microsoft and Unix file systems It supports attempting to recover files from a variety of file systems, including FAT, FAT12, FAT16, FAT32, FreeBSD, EXT2, EXT3, OpenBSD, and UFS TASK also works on binary image files, as long as there are no embedded checksum values This means that TASK will currently not work on EnCase evidence files and SafeBack files TASK works with only a single partition Therefore, you must image each partition on a drive separately in order to use this tool Using TASK, you may be able to recover previously deleted files in your binary image file created by dd To accomplish this, you would use the following command to list all of the files present on the media you are examining In this case, the binary forensic duplicate file called evidencefloppybin
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fls -r -f fat -p evidencefloppybin
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The format of the output from this command is as follows:
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(file perm)/(file perm) (*) (inode): (filename)
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An asterisk (*) in the second column indicates the file was deleted For example, the following denotes a deleted file named fstxt, found at inode 1515:
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r/r * 1515: fstxt (FSTXT)
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Once you identify a file you want to recover with the fls tool , you can use the icat command to reconstruct that file If you wanted to recover a file with inode number 1515, you would use the following syntax:
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icat -f fat evidencefloppybin 1515 > fstxtrecovered
The above command would create a file called fstxtrecovered, which would be an exact duplicate of the original, deleted file Table 11-1 lists several of the useful tools included in the TASK suite We executed icat on many different files, and it appears that the tool only recovers the first portion of the file displayed Therefore, icat does not appear to successfully follow the cluster chain This is a laborious task to perform every time you want to undelete a file We have used TASK with varying degrees of success We have found that when dealing with file
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Tool fsstat dcat dls ils istat icat fls
Function Displays filesystem information such as file system type, volume label, etc Displays the contents of a filesystem-specific unit address in hex, web, or ASCII format Displays the contents of the unallocated data within the filesystem Lists the raw values of the metadata structures Defaults to listing only the unallocated ones Lists the metadata information at a specified structure address in ASCII format Displays the data located at a specified address (inode) Lists directory and file names, including deleted ones TASK Suite Tools
Table 11-1
recovery from FAT file systems, Fatback is a more accurate and easier tool to use The Tool Task changed its name to the Sleuth Kit right before this book went to press It can be found at the following web site
GO GET IT ON THE WEB TASK: http://wwwsleuthkitorg/sleuthkit/indexphp
Running Autopsy as a GUI for File Recovery
The Autopsy Forensic Browser is a graphical interface to the utilities found in TASK It allows you to analyze allocated files, previously deleted files, directories, data units, and metadata of forensic images in a read-only environment Autopsy provides a GUI front-end for the following types of functions: M I I L Initiating string and regular-expression searches Recovering deleted material Creating a timeline of events, by examining the modified, access, and changed times of files Importing hash databases of known-good files so that you can perform hash comparisons with the evidence files
Autopsy is HTML-based and uses a client/server model The Autopsy server runs on many Unix systems, and the client can run on any platform with an HTML browser This enables you to designate a central Autopsy server and allow numerous examiners to
11:
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connect to it from remote locations Autopsy will not modify the original images, and the integrity of the images can be verified in Autopsy using MD5 values Figure 11-15 shows the opening screen you see when connecting to an Autopsy server After you connect to the Autopsy server, just click New Case to begin Figure 11-16 shows the Create a New Case screen Once you create a new case, you can start reviewing the files contained on the evidence media (or forensic duplication) Figure 11-17 shows how Autopsy displays the file data in a file system Notice how previously deleted files appear in red on the generated report, making them easy to find You can also get specific metadata concerning each file on the evidence media, such as time/date stamps for each file and file size Figure 11-18 is an example of how Autopsy reports the metadata for a deleted file (from a FAT12 partition) When using Autopsy, a small magnifying glass shows up directly under the menu item currently selected
Figure 11-15
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