CompTIA CSA+ Cybersecurity Analyst Certification All-in-One Exam Guide (CS0-001) (EBook) by Maymi Fernando & Chapman Brent

Author:Maymi, Fernando & Chapman, Brent [Maymi, Fernando]
Language: eng
Format: azw3
Publisher: McGraw-Hill Education
Published: 2017-09-01T04:00:00+00:00

Forensic Duplicators

Forensic duplicators are systems that copy data from a source to a destination while ensuring that not even a single bit gets altered in the process. What sets them apart from any copying utility is that they do not rely on file system operations, which means they can recover file system artifacts such as the Master File Table (MFT) in Windows systems and the inode table in Linux ones.

dd The venerable workhorse in Linux is the dd utility that comes by default with most systems. Because almost everything in the extended file system (ext) used in Linux is a “file” (even network connections and peripheral devices), dd can duplicate data across files, devices, partitions, and volumes. The following command will do a bit-for-bit copy of hard drive “hda” to a file called case123.img using a block size of 4096 bytes, and it will fill the rest of a block with null symbols if it encounters an error:

dd if=/dev/hda of=case123.img bs=4k conv=noerror,sync

Note that this command does not generate a hash of the output file, which we need for verification. The solution is to simply use the sha1sum command separately.

FTK Imager FTK Imager is a free data preview and imaging tool developed by Access Data. Unlike the dd utility, this imager is a full-featured product that allows you to perform a forensically sound acquisition, verify it by generating MD5 and/or SHA-1 hashes, and even preview the files and folders in a read-only fashion. FTK Imager will also read registry keys from Windows and let you preview them and their values. It also supports compression, encryption, and multiple output formats, including EnCase Evidence File format (E01) and the raw format generated by dd (001).

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