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Since you shut off the auditing, the Security log will not record events on the forensic workstation However, realize that the other logs will be populated by any events that your forensic workstation desires to log at this time Since the system name of your forensic workstation should be different from the evidence system name, you should be able to distinguish between entries The time/date stamps also tell you which events belong to the forensic workstation Merely save the event log as soon as possible to avoid the forensic workstation entries in the logs
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The default Security event log settings for Windows are to log nothing at all This means that, by default, Windows systems do not log successful logons, files accesses, shutdowns, and many other important events This can make investigating Windows systems a challenge One of the difficulties with Windows logging is that Event Viewer allows you to view only a single record at a time This often makes reviewing Windows system logs rather time-consuming and difficult Another more perplexing and serious drawback is that these logs only record the source NetBIOS name, rather than the IP address of the remote system This makes conclusive identification of remote connections to Windows systems impossible using only event logs! The default settings for Windows event logs restrict each log file to a maximum size of 512KB and a time length of seven days When the fixed size is reached, the log file is closed, and it must be cleared before you are able to begin logging to that log file again You can change these options in the Log Settings menu, but remember that the size and time length of each log (Security, Application, and System) need to be set individually Reviewing Windows logs using Event Viewer can be a difficult and cumbersome task We have researched the best way to audit large Windows networks, and we conclude that host-based and network-based IDS software provides log entries that are much faster and easier to review than standard Windows logging However, we still feel Windows auditing is important, even though many experts will say Windows auditing is bad or inadequate One of the drawbacks of reviewing system logs offline is that the logs populate the Description field by using values from various dynamically linked library (DLL) files This should not affect offline review of the Security log, since its messages are standard, but the Application log may contain entries that do not have the proper description text messages that correspond to the event ID an application generated Unless the forensic workstation you use has the exact applications installed as the evidence system, you will be missing much of the explanatory data in the Application log, as shown in the example in Figure 12-3 Using PsLogList and importing the event logs into Excel or some other spreadsheet application, as described in the previous section, makes it easier to review the logs and create reports
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Figure 12-3
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An empty Description field in the Application log
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You are performing offline review of a system s Application log, and you see an entry made from the system s anti-virus software The problem is that your forensic workstation is unable to populate the Description field on the entry to determine what message the virus scanner was communicating
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During your review of the Application log from the restored image, keep track of the applications that logged events that require the descriptive messages from the Registry To translate the seemingly useless numbers into the proper descriptive messages, you will need to get a copy of the System Registry hive file from the restored image This file s default location is in the \%systemroot%\System32\Config directory Import the System hive by using Regedt32 Make sure to name the imported hive appropriately so you do not confuse it with the local Registry of the forensic workstation
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