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For the most part this has led to an increase in escalated ticket quality. For example if an alert identifies a host and tags it with 40 risk 5 times, the analysts see that 200 Risk was added by Alert X for the time range. It is not meant to identify bursts of critical severity events, but the lower-level stuff that is supposed to add up to a bad picture.įor actual notification, we generate new Notables with a critical severity that include the total risk score and scores contributed by constituent Risk events. "500 is much too high to not identify criticals!" But, if you're ignoring 5 critical severity alerts, your process is already wrong and doing risk-based alerting will not help you anyway. I think I evaluated these over the same 14 day dataset for a few days before settling on these values. Below that, the "risky activity" was really closer to baseline noise, and almost anything over 500 for a given period had something hinky to it. You might be surprised to find out I arrived at about 500 risk/15m. Then I started looking at risk over time intervals, trying to find out how much risk is enough for our chosen interval (15 minutes). Then I did nothing for a while as I let the risk scoring roll in. I deployed the majority of it! We went through all the existing searches and identified their severity and whatnot and assigned a risk score based on that (increments of 20, ending at 100 for a critical this is standard for Enterprise Security as of 6.4). If you have any additional resources on RBA or Splunk ES in general please share! Thank you in advance What metrics do you collect on Risk Objects and Risk Scores? Is it adding value to and for your SOC? What are some of the "Thresholds" that you have to meet in your environment to trigger a Notable event that leads to an investigation? How do you determine a risk score to assign to those risky events? Is there some sort of formula that you use to scale them respectively?
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This can be a broad answer, for example, right now we have - download activity, threat list hits, vulnerabilities, etc. What events in your environment do you deem "Risky" or do you have set to generate risk? I wanted to hear from anyone who is currently using the Risk-Based Alerting approach and tap in on some of the knowledge.
and combat alert fatigue + too much whitelisting I found great value in the context that RBA provides when dealing with investigations vs the traditional security alert that provides very little to no context at all. conf RBA presentations and slide decks and have built and implemented a similar version in my organization's SOC. Splunk Enterprise Security - Risk-Based Alerting(RBA) - Anyone doing this? if so, how and why?