Hey,

I would tell you to get "The Tao of Network Security Monitoring: Beyond Intrusion Detection" book by Richard Bejtlich. It's a great book on the subject, but as there stated for effective SIEM correlation and results you should try to find a balance between: statistical data, full content data and intrusion detection. The book is a true must read for anyone working with SIEM, in order to maximize your "bang for buck".

cheers

-----Original Message-----
From: listbounce (at) securityfocus (dot) com [email concealed] [mailto:listbounce (at) securityfocus (dot) com [email concealed]] On Behalf Of Thugzclub Thugzclub
Sent: 09 July 2012 02:36
To: listbounce (at) securityfocus (dot) com [email concealed]; security-basics (at) securityfocus (dot) com [email concealed]; pen-test (at) securityfocus (dot) com [email concealed]; discussion (at) siemusers (dot) org [email concealed]
Subject: SIEM Use Cases

Hi,

This may not be the right forum ( if so please point me to the right
location) but here goes:

I am working on a project where we are integrating a SIEM into our environment and I need to create a monitoring and alerting standard.

If I can explain some more:
- There are specific "isolated" suspicious behaviour that we would want the SIEM to alert on e.g e.g Admin logon at specific times of the day, mid night for instance.
- There are also specific "combination" of suspicious behaviour that we should alert on: e.g

I have a simple 3-tier web app behind a firewall, and four event sources for SIEM: a firewall, system events from whatever daemon running on your servers and an (D)IDS

Event 1 : IDS says I have an SQL injection. Taken alone, this is false, it's just an attempt at an SQLi and I have no idea whether or not it has succeeded.
Event 2 : system daemon says I have a file creation on a temp folder in your DB server Event 3 : system daemon says said dropped file is ran under the DBserver user Event 4 : firewall says I have outbound connection created to blah server on port 80 Event 5 : IDS says blah server is hosted on an IP with a bad reputation (I assume that's the D in DIDS)

Based on the above, I would say that i have been hacked.

The query that I have is: are there specific set of malicious behaviour or "use cases" similar to the above that I can use as the basis for configuring my SIEM to detect against malicious patterns of behaviour.

Thanks in advance.

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