Reference no: EM133544329

Computer Forensics and Analysis

Assessment - Practical Case Study

Task 1: Recovering scrambled bits - Demonstration of practical case study.

This task helps you to test your skills in encryption and decryption of some data that you may encounter in the field of digital forensics. For this task I will upload a text file with scrambled bits on the subject interact2 site closer to the assignment due date. You will need to use some DFT (digital forensics tool) to recover the scrambled bits. First, decide what DFT will be suitable for this task and then start your process. Please note you may need to do few iterations and some trial and test to get the goal. Your bit recovery process will be step by step which means you may not see the whole recovered bits just after one step, you may need to use several steps to recover all bits in the given file. You will be required to restore the scrambled bits to their original order and copy the plain text in your assignment.

Task 2: Digital Forensics Report
In this major task you are asked to prepare a digital forensic report for the following scenario after carefully reading the scenario and looking at textbook figures as referred below:

In addition, you are also to comment on the ethical issues / implications that may arise during your investigation. See further explanation of this in the deliverables below.

You are working in a Digital Forensic Investigation company, ABC Forensics (you can come up with your own company name if you are not fan of this name) and investigating a possible intellectual property theft by a new employee of Superior Bicycles, Inc. This employee, Tom Johnson, is the cousin of Jim Shu, an employee who had been terminated. Bob Aspen is an external contractor and investor who gets a strange e-mail from Terry Sadler about Jim Shu's new project (shown in Figure 8-5 of the textbook on p. 350). Bob forwards the e-mail to Chris Robinson (the president of Superior Bicycles) to inquire about any special projects that might need capital investments. Chris forwards the e-mail to the general counsel, Ralph Benson, asking him to look into it. He also forwards it to Bob Swartz, asking him to have IT look for any e-mails with attachments. After a little investigation, Bob Swartz forwards an e-mail IT found to Chris Robinson (shown in Figure 8-6 of the textbook on p. 350).

Chris also found a USB drive on the desk Tom Johnson was assigned to. Your task is to search for and determine whether the drive contains any proprietary Superior Bicycles, Inc. data in the form of any digital photograph and/or in any other form such as emails, text, spreadsheets etc as an evidence. In particular, you may look for graphic files such as JPEG on the USB drive

hidden with different format. But during the investigation you also look for other type of data as mentioned above. As a digital forensic specialist, you do not pre-assume that you will (or will not) find what you are looking for. However, you need to make sure that you conduct comprehensive investigation before reaching to any conclusions.

Note for the USB drive image, you need to download the "C08InChp.exe" file from the download section of Chapter 8 on the student companion site of the textbook (Nelson, Phillips, & Steuart, 6/e, 2019).

In order to conduct a thorough investigation, search all possible places where you think that data might be hidden (e.g. in e-mails and USB drive) and recover and present any digital evidence in the report. You may find that some of the files that you found cannot be opened properly or may be damaged or may be made corrupt intentionally, mention such files in your report. You may look at how to repair these files (hint: look at files headers). If you repair a file, mention your report that you have done so using a specific DFT. You do not need to write the whole repairing process if it is too long. If your current free version of the DFT cannot save large size files, you may consider searching and using other similar DFT that can save the larger size files. Assume that your company does not have the budget to purchase another DFT for this purpose, so you have to go with the free version.

You should also be asking this question while doing investigation, are there any evidence other than images in this case (although you have been specifically asked to look for images)?

For this forensic examination, you need to provide a report of approximately 10-12 pages (this is not a hard page limit, take it as a guideline) in the format described in presentation section below. Your report must include screen shots of your work and any images that you may have found during the investigation. Make sure that each screen shot has proper label, e.g. something like Figure 1: Screen shot of opening USB file. etc. You also provide a brief (one or two sentence) description of that screen shot or the image that you inserted in your report.

This may increase the number of pages of your report, which is acceptable. But make sure, if this is the case, you only include the screen shots which you think are necessary for the report.

In the findings section of your report, please comment on the ethical issues / implications that you may encounter during your investigation. Your comments should be clear, concise and to the point to articulate all the ethical issues and consequences related to the investigation.

You may have used various sources for collecting information such as lecture notes, web sources and forums etc. Cite all the sources of information in references that you used to prepare the report.

RATIONALE

This assessment task will assess the following learning outcome/s:

• be able to determine and explain the legal and ethical considerations for investigating and prosecuting digital crimes.
• be able to formulate a digital forensics process.
• be able to evaluate the technology in digital forensics to detect, prevent and recover from digital crimes.
• be able to analyse data on storage media and various file systems.
• be able to collect electronic evidence without compromising the original data.
• be able to evaluate the functions and features of digital forensics equipment, the environment and the tools for a digital forensics' lab.
• be able to critique and compose technical tactics in digital crimes and assess the steps involved in a digital forensics' investigation.
• be able to prepare and defend reports on the results of an investigation.

PRESENTATION
The following should be included as minimum requirements in the report structure:

Executive Summary
This section provides a brief overview of the case, your involvement as an examiner, authorisation, major findings and conclusion
Table of Contents
Introduction
Background, scope of engagement, forensics tools used and summary of potential findings

Analysis Conducted
Description of relevant programs on the examined items
Techniques used to hide or mask data, such as encryption, steganography, hidden attributes, hidden partitions etc
Graphic image analysis

Findings
This section should describe in greater detail the results of the examinations and may include: o Specific files related to the request
Other files, including any deleted files that support the findings
String searches, keyword searches, and text string searches
Internet-related evidence, such as Web site traffic analysis, chat logs, cache files, e-mail, and news group activity
Indicators of ownership, which could include program registration data.

Conclusion
Summary of the report and results obtained. Do not introduce new results or new ideas in conclusions. Repeat the information from Executive Summary.

References
You must cite references to all material you have used as sources for the content of your work

Glossary (Optional)
A glossary should assist the reader in understanding any technical terms used in the
report. Use a generally accepted source for the definition of the terms and include appropriate references.

Appendices (Optional)
You can attach any supporting material such as printouts of particular items of evidence, digital copies of evidence, and chain of custody documentation.

Attachment:- Practical Case Study.rar