qr code to excel app 20: Computer Forensics in Software

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20: Computer Forensics
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Figure 20-1 Investigative method rigor
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Further, if the computer being analyzed is a server, it is unlikely management will support taking it offline and shutting it down for investigation So, from an investigative perspective, either course may be correct or incorrect, depending on the circumstances surrounding the incident What is most important is that you are deliberate in your work, you document your actions, and you can explain why you took the actions you did EXAM TIP For Security+ testing purposes, remember this: the memory should be dumped, the system powered down cleanly, and an image should be made and used as you work Many investigative methods are used Figure 20-1 shows the continuum of investigative methods from simple to more rigorous Figure 20-2 shows the relationship between the complexity of your investigation and both the reliability of your forensic data and the difficulty of investigation PART V CAUTION You should never examine a system with the utilities provided by that systemYou should always use utilities that have been verified as correct and uncorrupted Do not open any files or start any applications If possible, document the current memory and swap files, running processes, and open files Disconnect the system from the network and immediately contact senior management If your organization has Computer Incidence Response Team (CIRT) procedures, follow them Capture and secure mail, Domain Name Service (DNS), and other network service logs on supporting hosts Unless you have appropriate forensic training and experience, consider calling in a professional
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Figure 20-2 Rigor of the investigative method versus both data reliability and the difficulty of investigation
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Evidence must be properly marked as it is collected so that it can be identified as a particular piece of evidence gathered at the scene Properly label and store evidence, and make sure the labels can t be easily removed Keep a log book identifying each piece of evidence (in case the label is removed); the persons who discovered it; the case number; the date, time, and location of the discovery; and the reason for collection This information should be specific enough for recollection later in court It is important to log other identifying marks, such as device make, model, serial number, cable configuration or type, and so on Note any type of damage to the piece of evidence Being methodical is extremely important while identifying evidence Do not collect evidence by yourself have a second person who can serve as a witness to your actions Keep logs of your actions during both seizure and during analysis and storage A sample log is shown here:
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Item Description Dell Latitude laptop computer, D630, Serial number: 6RKC1G0 Investigator Smith Case # Date C-25 30 Jan 2008 Time 1325 MST Location Room 312 safe Reason Safekeeping
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Protect evidence from electromagnetic or mechanical damage Ensure that evidence is not tampered with, damaged, or compromised by the procedures used during the investigation Be careful not to damage the evidence to avoid potential liability problems later Protect evidence from extremes in heat and cold, humidity, water, magnetic fields, and vibration Use static-free evidence protection gloves as opposed to standard latex gloves Seal the evidence in a proper container with evidence tape, and mark it with your initials, date, and case number For example, if a mobile phone with advanced capabilities is seized, it should be properly secured in a hard container designed to prevent accidentally pressing the keys during transit and storage If the phone is to remain turned on for analysis, radio frequency isolation bags that attenuate the device s radio signal should be used This will prevent remote locking or disabling of the device
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