Chapter 3 Flashcards
What’s the main goal of a static acquisition?
to preserve the digital evidence.
Name three formats of digital forensics acquisitions.
Raw Format, Proprietary Formats, Advance Forensic Format
What are two advantages and disadvantages of the raw format?
fast data transfers and capability to ignore minor data read errors on the source drive, Requires as much storage space as the original disk or that it might not collect marginal (bad) sectors on the source drive.
List two features common with proprietary format acquisition files.
to compress or not to compress, Capability to split an image into smaller segmented files, Capability to integrate metadata into the image file ( date and time, hash values).
Of all the proprietary formats, which one is the unofficial standard?
Expert Witness Format
Name two commercial tools that can make a forensic sector-by-sector copy of a drive to a larger drive.
EnCase, SafeBack, and SnapCopy
What does a logical acquisition collect for an investigation?
only specific files of interest to the case
What does a sparse acquisition collect for an investigation?
fragments of unallocated data in addition to the logical allocated data
What should you consider when determining what data acquisition method to use?
size of the source drive, whether the source drive be retained as evidence, how long the acquisition will take, and where the disk evidence is located
Why is it a good practice to make two images of a suspect drive in a critical investigation?
to ensure at least one good copy of the forensically collected data in case of any failures
When you perform an acquisition at a remote location, what would you consider to prepare for this task?
determining whether there’s sufficient electrical power and lighting and checking the temperature and humidity at the location
With newer Linux kernel distributions, what happens if you connect a hot-swappable device, such a USB drive, containing evidence?
Newer Linux distributions automatically mount the USB device, which could alter data on it.
n a Linux shell the fdisk -1 command lists the suspect drive as /dev/hda1. Is the following dcfldd command correct?
dcfldd if=image_file.img of=/dev/sha1.
False
The correct command is dcfldd if=/dev/hda1 of=image_file.img. If performing the other command without a write blocker could alter the data and thus remove that evidence from existence in a case if no write blocker was used.
What is the most critical aspect of computer evidence?
validation
What is a hashing algorithm?
A program designed to create a binary or hexadecimal number that represents the uniqueness of a data set, file, or entire disk
The Linux dcfldd command, which tree options are used for validation data?
hash=, hashlog=, and vf=
What’s the maximum file size when writing data to a FAT32 drive?
2 GB (a limitation of FAT file systems)
What are two concerns when acquiring data from a RAID server?
1) amount of data storage needed.
2) the type of RAID server (0, 1, 5, etc.)
3) whether your acquisition tool can handle RAID acquisitions.
4) whether your analysis tool can handle RAID data
5) whether your analysis tool can split RAID data into separate drives
With remote acquisitions, what problems should you be aware of?
a. Data transfer speeds
b. Access permissions over the network
c. Antivirus, antispyware, and firewall programs
How does ProDiscover Investigation encrypt the connection between the examiners and suspect’s computers?
ProDiscover provides 256-bit AES or Twofish encryption with GUID and encrypts the password on the suspect’s workstation.
What is the ProDiscover remote access program?
PDServer
Which computer forensics tools can connect to suspect’s remote computer and run surreptitiously?
EnCase Enterprise, ProDiscover Investigator, and ProDiscover Incident Response
EnCase, FTK, SMART, and ILook treat an image file as though it were the original disk.
T
FTK Imager can acquire data in a drive’s host protected area.
F
