Low Hanging Fruit Tastes Just as Good

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Presented at Flocon 2017 by

We often hear as some network security tasks as being "low hanging fruit." There are network monitoring tasks that seem simple, but the work is tedious or requires significant time to produce results that they never get the time and effort they deserve. Taking the time to accomplish these seemingly simple tasks can provide valuable situational awareness. We used the CERT NetSA security tool suite to monitor traffic and establish baselines of our internal network IP addresses. By deriving simple network statistics of each IP address, we are able to automate alert generation when an anomalous behavior is detected. Similarly, we are able to build lists of all of the domains queried from our network. After enough time, any new domains, and changes to the previously seen domains, are worth investigating. This talk demonstrates the steps we took to perform this analysis with our publicly available tool suite.