= A forensic examination is a process of collecting, preserving, analyzing, and presenting digital evidence in a manner that is legally acceptable. The first step in conducting a forensic examination is to create an image of the original data on new media, such as a hard disk, a CD-ROM, or a USB drive. This is done to ensure that the original data is not altered, damaged, or destroyed during the examination. An image is an exact copy of the data, including the file system, the slack space, and the deleted files. Creating an image also allows the examiner to work on a duplicate of the data, rather than the original, which may be needed as evidence in court. Booting the original hard disk on a clean system is not a good practice, as it may change the data on the disk, such as the timestamps, the registry entries, and the log files. Duplicating data from the backup media is not sufficient, as the backup media may not contain all the data that is relevant to the investigation, such as the deleted files, the temporary files, and the swap files. Shutting down and relocating the server is not advisable, as it may cause data loss, corruption, or tampering. The server should be kept running and isolated from the network until an image is created. References = CISM Review Manual 15th Edition, page 204-205.
Prior to conducting a forensic examination, an information security manager should create an image of the original data on new media. This is done in order to preserve the evidence, as making changes to the original data could potentially alter or destroy the evidence. Creating an image of the data also helps to ensure that the data remains intact and free from any interference or tampering.
