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Batching: Log data accumulates locally and then batches of logs are sent to the remote repository at regular intervals This is the easiest system to implement as most programs log information locally A number of systems are available that can securely transfer log files to a remote repository on a periodic basis The problem is that an intruder can examine and/or modify the logs before they get batched to the remote log system Secure channel: The better approach is to create a secure channel from the application directly to a secure log repository Not every application supports this process With some systems, a creative trick can be used to capture the log as it s written to the local file and pipe it across the network to the remote logging facility
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Once logs are collected and centralized, they can be analyzed A good analysis strategy uses a combination of automatic and manual analysis techniques Automatic analysis can raise flags that should be checked when manually analyzing the logging data A brief description of each follows: Automatic Analysis: A number of commercial and freeware software programs exist that are capable of analyzing and correlating logs from many different sources Most Intrusion Detection Systems (IDSs) are fundamentally automatic log analysis tools The idea is that these software programs can scan through millions of lines of log files and spot trends and suspicious log entries that no human could find These systems often match log files against databases of signatures or patterns that various hacking/virus/Trojan intrusions leave behind Automatic systems are limited, however, as they can only do what they ve been programmed to do An experienced network administrator may be able to see things that an automated analysis tool was not programmed to recognize Manual Analysis: Going through log files by hand can be either incredibly tedious or more effective than the best automated system available It all comes down to the skill of the analyst With the right tools, sifting through millions of log entries by hand is relatively easy Having a good command of powerful searching tools is a must Being able to write custom scripts is also helpful For example, the authors frequently examine network packet dumps by eye Our experience allows us to pinpoint traffic anomalies within a few seconds We have even been known to accurately diagnose network problems based on how fast the activity lights on a switch were blinking Then again, we ve also been known to nearly electrocute ourselves by attempting to plug RAM directly into a running computer
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Valuable Information in Logs: Log files can contain lots of interesting bits of information In some cases they intentionally record juicy stuff In others it s purely unintentional For example, web logs can end up gathering far more data than anyone would anticipate due to buggy browsers that give out too much information Usernames, email accounts, passwords all this and more may be sitting in innocent log files scattered throughout a system Consequently, logfiles are major hacker targets Capturing Logs In Transit: When logs are centralized, they might travel across the net A smart hacker will follow the path of the log packets to the true central logger The hacker will then either capture the logging packets for later analysis or simply attempt to compromise the log server Encryption and dedicated logging connections are solid techniques for protecting log files in transit Overconfidence: The analysis system says all is fine, so all is fine, right Some of the more advanced products on the market are marketed as infallible In reality, dedicated hackers can get by these systems Even if the system is good, chances are it s been partially disabled to allow more convenient use of the network A good human-based analysis on a regular basis will do wonders for network security and performance False Positives: The flip side of the coin is the ever-alarmed analysis system The minute somebody in accounting opens up the wrong web site WHAMMO! Sirens blaring, net admins flying out of their bat caves, total pandemonium, followed by excessive cursing about the highly sensitive analysis system Eventually, somebody unplugs the damn thing by accidentally tripping on the power cord and makes employee of the month
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