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Data Analysis Techniques
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NTFSGETS is NTI s tool for writing all of slack space to a single file The following command line generates a single file called slackspace for all slack space found on the f: drive
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ntfsgets d:\slackspace f:
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The output file slackspace is given an extension of Snn , where nn is a sequential number generated by the program The /F switch can be used to produce a more compact output that does not include binary data This can significantly reduce the size of the output file in cases where the user is interested only in data that will appear as normal ASCII text The command lines for NTFSGETF is identical to NTFSGETS, except that the output file contains all the unallocated space and free space on the physical disk you are performing the operation on Both EnCase and FTK automatically reveal slack space and unallocated space on the qualified forensic duplication Since these tools do not require you to restore the original evidence to its own hardware, command line tools such as NTFSGETF and NTFSGETS are rarely used Figure 11-20 shows the icons that EnCase uses to represent unallocated space and slack space, as well as some other disk structures
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During discovery, production of Jenck s material, production of Brady material, etc, do not be surprised if law enforcement provides you with media that contain a folder for each of the following types of data: M I I L All logical files All recovered files A single file containing all the data recovered from slack space A single file containing all the data recovered from unallocated and free space
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Many law enforcement agencies still use command line tools that carve out slack space and unallocated space
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The icons used by EnCase to reference unallocated space and slack space
Incident Response & Computer Forensics
GENERATING FILE LISTS
One of the most critical, yet overlooked steps in analyzing the contents of a hard drive is to create informative file listings These file listings should include the following information, at a minimum: M I I I I L Full path of each file found on the evidence media Last written and modified time/date stamps for each file Creation time/date stamps, if they exist (Linux does not maintain a creation time/date stamp!) Last access time/date stamps Logical size of each file An MD5 hash of each file
Another investigative step that can help alleviate the workload is to compare the MD5 hashes of known-good files with all the files on the evidence media It is not uncommon to eliminate more than 50 percent of the files on a Windows system from your analysis because the files have a known-good purpose For example, you may find that the files are operating system files or application files that arguably will not contribute to your case On the flip side, it is not uncommon to use the MD5 hashes of known-bad files in an effort to quickly locate files that are indicators of malicious intent
Listing File Metadata
We have developed scripts in-house that take dir output (Windows) or ls -al output (Unix) and populate a database for rapid time/date stamp correlation These in-house tools are especially helpful when you will not be doing a forensic duplication, but are merely performing a live response When you do have a forensic duplicate, however, we recommend using the EnCase environment or FTK to assist you in listing the file data During most cases, we find we need to order every file involved in the case by time/date stamps Figure 11-21 illustrates how intuitive and easy to use EnCase s interface is when it comes to displaying file data In Figure 11-21, we are ordering every file in the case in ascending order by file creation time We also adjusted the columns in the file tables that EnCase created, so we can view these three time/date stamps in adjacent columns EnCase also makes it very easy to export file data to a delimited text file that you can import into an application such as Microsoft Excel for additional analysis and reporting Figure 11-22 provides a glimpse of the fields that you can select to include in your export file If you do not own EnCase or FTK, you can use Danny Mares CATALOG, a commandline Linux tool, to create file lists The following command line works on a single partition drive (-p) and recursively lists all the files located on the mount point /mnt/harddrive, creating an output file called filelistingtxt
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