Today I will discuss:1. What are correlation rules?2. How SIEM correlation rules work?3. What is Data normalization in SIEM?Gateway ⛩ to become Skilled-Cybersecurity Professional 🕴🕴🕴 https://luminisindia.com/goehm---A SIEM correlation rule tells your SIEM system which sequences of events could be indicative of anomalies which may suggest security weaknesses or cyber attack.When “x” and “y” or “x” and “y” plus “z” happens, your administrators should be notified.Here are some examples of SIEM correlation rules which illustrate this concept.1.) Detect new DHCP servers in your network by watching for inside or outside connections which use UDP packets (“x”), have port 67 as the destination (“y”), and the destination IP address isn’t on the registered IP list (“z”).2.) Warn administrators if five failed login attempts are tried with different usernames from the same IP to the same machine within fifteen minutes (“x”), if that event is followed by a successful login occuring from that same IP address to any machine inside the network (“y”).The first example could indicate a cyber attacker establishing a DHCP server to acquire malicious access to your network. Any authorized DHCP server would use one of your registered IP addresses!The second example could indicate a cyber attacker brute-forcing an authentication vector and then successfully acquiring authentication to your network. It could be a possible privilege escalation attack.Both SIEM correlation rules could be triggered by honest mistakes and simple user errors or technical glitches. But they’re also key indicators of cyber attack and security administrators should check them out right away!--_

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