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Computer Forensics

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Computer Forensics

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  1. Computer Forensics Summer bridge Program Dr. HwaJUNGLeE dr. Ashley Podhradsky

  2. Objectives • What is computer forensics? • History of computer forensics • When is computer forensics used? • Computer Forensics in the news • Describe how to prepare for computer investigations • Computer Forensics Example- AccessData FTK Imager Guide to Computer Forensics and Investigations

  3. Understanding Computer Forensics • Computer forensics • Involves obtaining and analyzing digital information • Investigates data that can be retrieved from a computer’s hard disk or other storage media. Task of recovering data that users have hidden or deleted and using it as evidence. Evidence can be inculpatory (“incriminating”) or exculpatory • Related Fields • Network forensics • Yields information about how a perpetrator or an attacker gained access to a network • Data recovery • Recovering information that was deleted by mistake or intentionally • Typically you know what you’re looking for • Disaster recovery • Uses computer forensics techniques to retrieve information their clients have lost due to natural or man made disaster

  4. A Brief History of Computer Forensics • 1970s, electronic crimes were increasing, especially in the financial sector • Most law enforcement officers didn’t know enough about computers to ask the right questions • Or to preserve evidence for trial • Fraction of a penny crime (Office Space anyone??) • 1980s • Norton DiskEdit soon followed • And became the best tool for finding deleted file • Apple produced the Mac SE • A Macintosh with an external EasyDrive hard disk with 60 MB of storage • 1990s • Tools for computer forensics were available • International Association of Computer Investigative Specialists (IACIS) • Training on software for forensics investigations • ExpertWitness for the Macintosh • First commercial GUI software for computer forensics • Created by ASR Data

  5. Understanding Case Law • Technology is evolving at an exponential pace • Existing laws and statutes can’t keep up change • Case law used when statutes or regulations don’t exist • Case law allows legal counsel to use previous cases similar to the current one • Because the laws don’t yet exist • Each case is evaluated on its own merit and issues

  6. Preparing for Computer Investigations • Computer investigations and forensics falls into two distinct categories • Public investigations • Private or corporate investigations • Public investigations • Involve government agencies responsible for criminal investigations and prosecution • Organizations must observe legal guidelines • Law of search and seizure • Protects rights of all people, including suspects

  7. Preparing for Computer Investigations • Private or corporate investigations • Deal with private companies, non-law-enforcement government agencies, and lawyers • Aren’t governed directly by criminal law or Fourth Amendment issues • Governed by internal policies that define expected employee behavior and conduct in the workplace • Private corporate investigations also involve litigation disputes • Investigations are usually conducted in civil cases

  8. Understanding Corporate Investigations • Private or corporate investigations • Involve private companies and lawyers who address company policy violations and litigation disputes • Corporate computer crimes can involve: • E-mail harassment • Falsification of data • Gender and age discrimination • Embezzlement • Sabotage • Industrial espionage

  9. Understanding Corporate Investigations • Establishing company policies • One way to avoid litigation is to publish and maintain policies that employees find easy to read and follow • Published company policies provide a line of authority • For a business to conduct internal investigations • Well-defined policies • Give computer investigators and forensic examiners the authority to conduct an investigation • Displaying Warning Banners • Another way to avoid litigation

  10. Maintaining Professional Conduct • Professional conduct • Determines your credibility • Includes ethics, morals, and standards of behavior • Maintaining objectivity means you must form and sustain unbiased opinions of your cases • Maintain an investigation’s credibility by keeping the case confidential • In the corporate environment, confidentiality is critical • In rare instances, your corporate case might become a criminal case as serious as murder

  11. Preparing a Computer Investigation • Role of computer forensics professional is to gather evidence • Forensic Investigators are not police officers, it is our duty to show what happened, not prove guilt or innocence. • Collect evidence that can be offered in court or at a corporate inquiry • Investigate the suspect’s computer • Preserve the evidence on a different computer • Chain of custody • Route the evidence takes from the time you find it until the case is closed or goes to court

  12. Taking a Systematic Approach • Steps for problem solving • Make an initial assessment about the type of case you are investigating • Determine the resources you need • Obtain and copy an evidence disk drive • Identify the risks- Mitigate or minimize the risks • Analyze and recover the digital evidence • Investigate the data you recover • Complete the case report • Critique the case

  13. Planning Your Investigation • A basic investigation plan should include the following activities: • Acquire the evidence • Complete an evidence form and establish a chain of custody • Secure evidence in an approved secure container • Prepare a forensics workstation • Make a forensic copy of the evidence • Return the evidence to the secure container • Process the copied evidence with computer forensics tools

  14. Securing Your Evidence • Use evidence bags to secure and catalog the evidence • Use computer safe products • Antistatic bags • Antistatic pads • Use well padded containers • Use evidence tape to seal all openings • Power supply electrical cord. • Write your initials on tape to prove that evidence has not been tampered with • Consider computer specific temperature and humidity ranges

  15. Understanding Data Recovery Workstations and Software • Investigations are conducted on a computer forensics lab (or data-recovery lab) • Computer forensics and data-recovery are related but different • Computer forensics workstation • Specially configured personal computer • Loaded with additional bays and forensics software • To avoid altering the evidence use: • Forensics boot disk, Write-blockers devices, Network interface card (NIC), Extra USB ports, FireWire 400/800 ports, SCSI card, Disk editor tool, Text editor tool, Graphics viewer program, Other specialized viewing tools

  16. Digital Forensic Cases • BTK Killer • http://precisioncomputerinvestigations.wordpress.com/2010/04/14/how-computer-forensics-solved-the-btk-killer-case/ • Michael Jackson • http://www.dfinews.com/news/michael-jackson-death-trial-showcases-iphone-forensics • Caylee Anthony • http://www.christianpost.com/news/casey-anthony-trial-computer-expert-unearths-chloroform-internet-searches-50980/ Guide to Computer Forensics and Investigations

  17. Understanding Bit-Stream Copies • Bit-stream copy • Bit-by-bit copy of the original storage medium • Exact copy of the original disk • Different from a simple backup copy • Backup software only copy known files • Backup software cannot copy deleted files, e-mail messages or recover file fragments • Bit-stream image • File containing the bit-stream copy of all data on a disk or partition • Also known as forensic copy

  18. Acquiring an Image of Evidence Media • First rule of computer forensics • Preserve the original evidence • Conduct your analysis only on a copy of the data • Use FTK Imager to create a forensic image • www.accessdata.com/support/downloads • Your job is to recover data from: • Deleted files • File fragments • Complete file