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We then use the dump command to simply dump the file referenced by three different inodes Specifically, we recover the 12 kilobyte file, the 81 kilobyte file, and we even successfully recover the 2 gigabyte file
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debugfs: dump <1343493> /mnt/storage/recovered/k12 debugfs: dump <1343499> /mnt/storage/recovered/k81 debugfs: dump <1343490> /mnt/storage/recovered/g2 debugfs: q [root@localhost chapter11]# ls -al /mnt/storage/recovered total 2048360 drwxr-xr-x 2 root root 4096 Jun 10 03:27 drwxr-xr-x 6 root root 4096 Jun 10 03:24 -rwxr-xr-x 1 root root 2097414144 Jun 10 03:29 g2 -rwxr-xr-x 1 root root 12288 Jun 10 03:26 k12 -rwxr-xr-x 1 root root 82944 Jun 10 03:27 k81
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It turns out that all three files we dumped to /mnt/storage/recovered are in fact exact duplicates of our original files After numerous reboots, this technique for recovery will work; as long as the original media is not mounted for writing, you will be able to recover these files Our procedures for recovering files from the other Unix filesystems definitely involve as much art as science We try to find the inodes that reference the blocks that contain the data we searched for Not an easy task, but we usually rebuild what we need by hand and find what we need via string searching
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After you perform a forensic duplication of media, and you have recovered as many files as you can, there is still data left on the evidence media that you will want to review The remaining data is stored in slack space, unallocated space, and free space In order to understand slack space and unallocated space, we must first review what an allocation unit or cluster is Operating systems arrange all data stored on a hard drive into segments called allocation units (also called clusters) For example, an operating system that uses 32K clusters reads and writes data from a hard drive 32K at a time It cannot read less than 32K of data from a hard drive, and it cannot write less than 32K at a time to the hard drive However, very few files have the exact amount of data to occupy an entire cluster or set of clusters Therefore, when an operating system that writes 32K clusters to a hard drive is being asked to save a 20K Microsoft Word document, there is 12K of unused space called file slack In our example, there may be remnants of previous files in this 12K of file slack
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Many folks refer to two different types of slack space, RAM slack and file slack The following figure will help elucidate what we mean by these terms Figure 11-19 demonstrates how an operating system using 4K clusters would store a file that is 5,167 bytes in size We refer to the space from the end of file marker to the end of that physical sector as RAM slack, whereas the data from the end of the last physical sector used to the end of the allocation unit is called file slack RAM slack contains a small portion of random data whose source is whatever contents of RAM that happened to be chosen to fill that space Ordinarily, it is a tiny fragment of some executable file in memory File slack contains data from previously deleted files or from the factory conditioning of the hard drive
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Unallocated space is the area of the hard drive not currently allocated to a file Fragments of deleted files are often strewn across unallocated space on a hard drive Free space is the portion of the hard drive media that is not within any currently active partitions MS-Dos tools have been written that peruse the data on a hard drive (actual restored image, not a forensic duplicate file) and produce files that contain all the data within the unallocated space, free space, and slack space on a drive We are going to demonstrate using NTI s tools for writing the contents of slack space and free space to a file The tools are powerful and simple, and although we have not used them in years, they are still excellent forensic tools because they are straightforward and effective
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Figure 11-19
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