This post was most recently updated on May 16th, 2023
A well-known and well-liked term in the cybersecurity community. In this article, we will try to describe what SIEM is, what benefits it provides, what components it consists of, and how it really helps prevent attacks.
SIEM, or Security Information and Event Management, is a type of software that has been used for more than a decade in IT security departments. Now, siem monitoring service provides a holistic view of what is happening on the network in real-time and helps IT teams proactively combat threats. The uniqueness of SIEM solutions lies in the combination of security incident management and information management of the monitored environment. For an organization that needs full permeability and control over what is happening on its organize in genuine time, SIEM arrangements are basic.
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Why do we require SIEM?
Checking frameworks and systems has continuously played a key part in ensuring against assaults. Numerous interrelated assault strategies and strategies have advanced over a long time, and it rapidly got to be clear that the changing nature of cybercrime implies that a few dangers regularly go unnoticed.
Fusing data from multiple sources and correlating between different events has become necessary. So has the retention of this data for long periods of time. The increase in attacks has made compliance requirements and standards more stringent. HIPAA, ISO27001, and RODO – all require organizations to implement a comprehensive security control system, including monitoring, auditing, and reporting. All of these exercises are encouraged by a SIEM framework.
Basically put, a SIEM could be a multi-component security system for observing and investigating that points to assist organizations in distinguishing dangers and relieving assaults. SIEM combines a few disciplines and devices into one cohesive framework:
- Log Management (LMS)—tools utilized for conventional log collection and capacity
- Security Information Management (SIM)—tools or frameworks centered on collecting and overseeing security-related information from numerous sources, such as firewalls, DNS servers, switches, antiviruses
- Security Event Management (SEM)—systems based on proactive observing and examination, counting information visualization, occasion relationship, and cautioning
SIEM is the term utilized nowadays for an administration framework that combines all the over components into a single stage that knows how to naturally collect and handle data from disseminated sources, store it in one centralized area, compare distinctive occasions, and produce alarms based on that data
How SIEM works
SIEM works by collecting logs and events generated by hosts, security systems, and applications across an organization’s infrastructure and collating them on one centralized platform. From antivirus software events to firewall logs, SIEM identifies this data and categorizes it, which then helps investment.
When the program identifies actions that might imply a risk to the organization, alarms are created to demonstrate a potential issue and rapidly inform the fitting security offices. Alarms can be set with low or tall needs employing a set of predefined rules. For case, in case a client account creates 10 fizzled login endeavors in 10 minutes; this may be hailed as a suspicious activity but set to a lower need since it is most likely a client who has overlooked their account watchword. However, if an account experiences 100 failed login attempts in 5 minutes, it will most likely be a brute-force attack, and the incident will be marked with high priority.
All rules and dependencies in SIEM-class systems are static. That is, configured once, and they will not adapt to a changing environment. It’s usually difficult to choose the right set of rules and conditions so as not to trigger a lot of false-positive events but also not to miss a real incident. The latest SIEMs are enriched with UBA modules and artificial intelligence, allowing the organization’s network to create dynamic rules and learn from the data provided.
A SIEM is often not a single tool or application but a set of components that work together to form one cohesive system. There is no set standard of protocols or methodologies for SIEM-class systems, but virtually all of them include the following functionality:
Logs, representing the raw output from the processes running in the environment, are an excellent source of data providing a detailed picture of what is happening in real time. It is the essential source of data for SIEM. Whether it is information from other security frameworks or mistakes from benefit operations, the SIEM collects and stores it in one central area. The information collection preparation is ordinarily performed by specialists or applications conveyed on the checked frameworks and arranged to transfer information to a common database.
Once the log information has been collected, handled, and put away, the other step is occasion relationship.
This involves what is known as connecting the dots, that is, extracting relevant information from an organization’s infrastructure and correlating it with a security incident. The correlation activity is based on rules already built into a given SIEM system, predefined attack scenarios, or policies created and configured by the analyst.
Put another way; a correlation rule defines a sequence of events that can indicate a security incident. For example, a rule can be created that if more than 1,000 requests are sent from specific IP addresses and specific ports during a specific time period, it is associated with a DDoS attack.
The amount of data logged in extended IT environments is huge. In medium-sized companies, it is GBs of data per day. Correlating in SIEM systems makes it possible to condense this data, remove unnecessary noise, and get information that means something to the user.
The ability to visualize data and events is another key functionality of SIEM systems. Dashboards, visualizations, or views help spot trends or anomalies and monitor the overall state of the environment. Some SIEM tools come with ready-made dashboards for incident management and visualization, while others additionally allow users to create their own views.
Once incidents are properly correlated and monitored, in order to provide comprehensive system protection, it is necessary to have a way to deal with incidents once they are detected. Most SIEM systems include mechanisms to automatically block and restrict access to an attacked device or resource. It is also possible to perform actions automatically, such as calling a script, creating a service request, or sending an email.