Why do we need a SIEM?

Author: Jake Knight
Release Date: 20/04/2021

What is a SIEM and why do we need one?

Security Information and Event Management (SIEM) software allows security teams to keep on top of security alerts in real time. These systems collect security log data from diverse sources, categorising and analysing security alerts. It combines security event management meaning long term storage, analysis and reports with security event management which monitors systems in real time. SIEM platforms use correlation and statistical algorithms to extract actionable information from event and log entries. A well tuned SIEM can help the security teams to filter through the noise and volume of data to hone in on the important risks.

Main reasons to implement a SIEM:

  • Detecting Incidents – SIEMS solution detects incidents that could otherwise go unnoticed.
  • Compliance with Regulations – Companies use SIEM to meet compliance requirements by generating reports that address all logged security events among these sources.
  • Incident Management – A SIEM improves incident management by allowing the security team to identify an attack’s route across the network, identifying the compromised sources and providing the automated mechanisms to stop the attacks in progress.

Best Practice for a successful SIEM implementation

We have helped many customers get the most out of their SIEMs by:

  • Establish the scope and requirements – Know exactly what data you want your SIEM to monitor. This follows on from understanding the organisation’s risks and knowing what’s important. Are you looking to manage your own SIEM or looking into a hosted or managed service. Make sure you know the security use cases you need to achieve making sure you cover any industry compliance requirements.
  • Customise your correlation rules – Correlation rules group alerts together so that you see the security picture as a whole. While most SIEM’s come with a set of built-in rules every business is different. Make sure you have rules covering what’s important to you and your organisation. Make sure rules are adjusted to reduce noise and false positives.
  • Have an incident response plan – SIEM’s provide near real time alerting but without a response plan in place it can be difficult to react in a timely manner should an incident be detected. Most SIEM’s come with features to help manage incidents but ensuring detailed step by step response plans are in place prevents mistakes and wasted time.
  • Update your SIEM continuously – Cyber attack methods are constantly evolving. Stay a step ahead by ensuring the platform is up-to-date and evolving with newly identified threats. It’s important to continually review your organisation’s cyber risk. There are some providers that give threat intelligence insights which can help your team stay a step ahead.

This security challenge has been made even more prevalent in a world where we have multiple cloud environments and largely remote workforces. We work extensively with clients to adapt their security strategy for their cloud migrations. 

Somerford Associates have a suite of solutions and services to help you with your security challenges. If you are interested in exploring these with me and your particular roadmap to a better security standing then please get in touch via marketing@somerfordassociates.com

For further information on Splunk ES, join our next Hands On Workshop or our webinar and if you are looking at Managed Detection and Response services, we partner with mnemonic.

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