Security Information and Event Management (SIEM)
Security-relevant activity takes place across your entire technology environment. User accounts, endpoints, servers, cloud platforms, network devices, business applications, and security tools all generate information that may help reveal an attempted attack or an emerging incident.
The challenge is bringing that information together and turning it into something useful. When logs remain distributed across separate systems, suspicious activity can be difficult to recognise. Important events may be overlooked, while technical teams spend valuable time searching through different platforms.
Security Information and Event Management services from CA help you collect, connect, and analyse relevant security data in one managed environment. We design and improve SIEM solutions that provide meaningful visibility, support earlier threat detection, and give your teams the information they need to respond effectively.
Why This Matters
A SIEM platform can provide a central view of security activity, but technology alone does not guarantee useful results. Collecting every available log without clear priorities can increase costs, generate excessive alerts, and make genuine threats harder to identify.
An effective SIEM needs the right data sources, relevant detection rules, clear ownership, and regular improvement. It must reflect how your organisation operates and the threats it is most likely to face.
A properly designed SIEM solution helps you:
Improve visibility across the environment
Bring relevant events from identities, devices, networks, cloud services, applications, and security tools into one place.
Recognise suspicious activity earlier
Connect events from different systems to identify patterns that may not be visible when each source is reviewed separately.
Support faster investigations
Give security teams access to the information they need without requiring them to search through multiple systems.
Strengthen reporting and evidence
Maintain reliable security records that support incident analysis, audits, regulatory reviews, and internal reporting.
Our Approach
We do not approach SIEM as a project to collect as much data as possible. More information does not automatically create better security, particularly when logs are incomplete, poorly configured, or unrelated to realistic threat scenarios.
Our approach begins with business risk and works backwards to the systems, events, and detection capabilities required. We consider technology, people, processes, costs, and ongoing operational responsibilities so that the SIEM remains useful after its initial implementation.
Understand the environment and define priorities
We begin by identifying your critical services, important data, key systems, user groups, and most relevant cybersecurity risks.
We review the existing technology environment and determine which log sources are available. These may include identity platforms, endpoint security tools, operating systems, network devices, cloud services, email platforms, databases, applications, and other security products.
Rather than connecting every source immediately, we prioritise the information that provides the greatest detection and investigation value. The selection is based on your risk profile, technical environment, regulatory requirements, and available resources.
Design and configure the SIEM environment
We design or improve the SIEM architecture, data flows, retention rules, access controls, integrations, and operational processes.
Log sources are configured to provide the required information in a reliable and consistent format. We also consider data volume, storage requirements, licensing models, and expected usage so that the technical design remains proportionate and financially manageable.
Where an existing SIEM is already in place, we assess its configuration, coverage, data quality, and operating model. This helps identify unused capabilities, missing information, excessive data collection, and areas where the platform is not providing the expected value.
Develop and tune detection rules
We create and refine detection rules based on realistic threats and the activities that would matter most to your organisation.
These may include unusual sign-ins, compromised accounts, unexpected privilege changes, malicious software, suspicious administrative activity, attempts to disable controls, unauthorised access, or unusual movements of data.
Detection rules are tested and adjusted to reduce false positives without hiding important activity. We also define the information analysts should receive with each alert so that they can understand its context, assess its severity, and decide what needs to happen next.
Establish operation and continuous improvement
A SIEM requires ongoing management. New systems are introduced, infrastructure changes, attacker behaviour develops, and detection rules may become less effective over time.
We help establish responsibilities for monitoring, alert investigation, escalation, platform maintenance, access reviews, log-source health, and detection improvement. We also define suitable reporting and review arrangements.
Regular reviews assess whether the SIEM is collecting the right information, producing useful alerts, supporting investigations, and operating within the expected cost. Data sources and detection rules can then be updated as the organisation and its risk profile change.
What Sets CA Apart
Risk-based log selection
We focus first on the information that supports your most important detection and investigation needs, rather than connecting every available data source without clear justification.
Detection built around realistic threats
Rules and use cases are aligned with your systems, users, business processes, and likely attack scenarios.
Practical cost management
We consider ingestion volumes, data retention, storage, licensing, and operational effort when designing the solution.
Support throughout the SIEM lifecycle
We help with initial assessment, architecture, implementation, optimisation, detection engineering, operational planning, and ongoing improvement.
The Business Value
Security Information and Event Management services from CA give your organisation a clearer and more consistent view of security activity across its technology environment.
Relevant information is brought together so that suspicious patterns can be identified earlier and investigations can begin with better evidence. Technical teams spend less time collecting information from separate systems and more time understanding what has happened and what action is required.
A well-managed SIEM also helps the organisation demonstrate that important security events are logged, reviewed, and handled through defined processes. This supports internal governance, regulatory requirements, customer assessments, and post-incident analysis.
The result is not simply a central store for technical logs. It is a practical detection and investigation capability that helps your organisation make better security decisions and respond to threats with greater speed and confidence.
Current joint guidance from international cybersecurity authorities also recommends tailoring SIEM log collection and analysis to the organisation’s environment and risk profile, with priority data sources introduced gradually rather than all at once.
Next Step
A SIEM should provide useful security insight, not simply collect increasingly large volumes of technical data.
Contact CA for an initial consultation. We will help you assess your current logging and monitoring capabilities, identify the most valuable data sources, and design or improve a SIEM solution that supports effective threat detection and investigation.