By IT Governance Publishing
This pocket consultant illustrates the technical complexities curious about computing device forensics, and indicates managers what makes the self-discipline appropriate to their organization. For technical employees, the publication deals a useful perception into the foremost procedures and systems which are required.
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Extra resources for Computer Forensics A Pocket Guide
A network sniffer such as tcpdump28can be used for the traffic capture, and tools such as Wireshark29 can be used to analyse traffic and provide protocol analysis. 28 tcpdump (2009). org 29 Wireshark Foundation (2010). org 56 6: Embedded and Network Forensics NetworkMiner30 is also an open source NFAT for Windows® that interestingly provides a hostcentric perspective of the network traffic. Embedded devices and network forensics are also useful as additional sources to verify or corroborate evidence found on a system.
Hash values of every file can be compared to a reference source. Those with matching hash values are trusted files and can therefore be removed from the analysis. NIST has developed the National Software Reference Library (NSRL), 15 which is freely available and integrates into many forensic analysers. This significantly reduces the burden upon the investigator. It is also extremely useful in malware and hacking investigations as it quickly becomes evident which OS files have been infected or modified.
If you are looking for images, you can perform a search to find all jpeg or bitmap images, etc. A very simply hiding technique used by novice computer users is to modify the file extension to something else in order to avoid such searches. However, most commercially available tools such as EnCase® and FTK®, are able to verify the signature of the files to ensure the file extension matches the file header. These keyword searches are able to scan through the entire disk, including unallocated clusters.