The value prop as I understand it: SIEMs let you quickly correlate and respond to an incident. Details be damned on how they achieve correlation; I want to know what happens once an incident is confirmed. Typically such a console event is treated as such; it's an event. From there you may be able to fire off a Remedy ticket; or count how many events have been reviewed or escalated. Basic work flow stuff that may add a reduction in the amount of monitoring hours. Maybe.
NIST 800-61 states: prepare -> detect -> contain -> eradicate -> recover -> lessons learned. This is pretty basic stuff. SIEMs appear to solely focus on the second step. But their value prop is to allow you to more quickly respond (aka: contain, eradicate, recover) from an incident. This is the disconnect for me. I have more detections than I can shake a stick at and I don't even own a SIEM. Funneling that through to yet another console that, in theory, gives a higher fidelity on the detection engine just isn't a value. What would be a value? What is the series of questions I ask every SIEM vendor who corners me?
- Once you have a true positive alert, then what?
- Can I apply my incident schema to it? I have specific severities, categories, and other attributes that must be reported on. Don't you dare give me generic classifications that mean near zero to my organization.
- Can I report based on any response metrics? Response times? incident handlers? volume? reoccurring hosts or possibly related prior incidents?
- Can it give me some hardcore incident analysis? Give me any several relevant data feeds; auto generated timeline capabilities would be very cool.
- Can it track all efforts of containment, eradication and recovery? I need an authoritative post mortem for future reporting.
- Can it track lessons learned and attach it per incident or collect aggregated lessons learned data?
- Shit, can it do anything with aggregated data? If so, you're highly advanced already!
- Can it handle different escalation paths dependent on the scope or severity?
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