SIEM vs SOAR
Detecting threats versus automating the response.
SIEM (security information and event management) collects and correlates log data to detect threats and support investigation. SOAR (security orchestration, automation and response) automates and coordinates the response to those threats through playbooks. SIEM finds the problem; SOAR helps act on it. They are complementary parts of a security operation, not alternatives.
The short answer
SIEM (security information and event management) collects and correlates log data to detect threats and support investigation. SOAR (security orchestration, automation and response) automates and coordinates the response to those threats through playbooks. SIEM finds the problem; SOAR helps act on it. They are complementary parts of a security operation, not alternatives.
SIEM aggregates log and event data from across the estate, correlates it, and analyses the result to detect threats, provide a searchable record for investigation, and support compliance.
- Detects threats by correlating logs and events
- Central, searchable record for investigation
- Supports compliance log retention
- Produces the alerts that a workflow then acts on
SOAR automates and coordinates security operations tasks, connecting tools together and running predefined playbooks to handle repetitive investigation and response steps, so analysts focus on decisions that need human judgement.
- Automates repetitive investigation and response
- Orchestrates action across separate tools
- Runs playbooks that encode best-practice response
- Speeds response and improves consistency
Key differences
Where SIEM and SOAR diverge, at a glance.
| SIEM | SOAR | |
|---|---|---|
| Stage | Detection | Response |
| Core job | Turn logs into alerts | Act on alerts, automatically |
| Works on | Log and event data | Alerts, tools and playbooks |
| Improves | What you can see | How fast you can act |
| Relationship | Feeds SOAR | Acts on SIEM output |
When to choose which
You need SIEM when the priority is detecting threats and retaining a searchable, compliant record of activity across the estate.
You add SOAR when analysts are spending too much time on repetitive triage and response steps, and you want to automate them to reduce response time and inconsistency.
SIEM and SOAR are designed to work as a pipeline: the SIEM detects and surfaces a threat, and the SOAR platform automates the enrichment, triage and response that follow. Modern platforms increasingly combine both, and a well-run security operations centre uses them together so that detection flows straight into fast, consistent action rather than sitting in a queue.
A worked example: from alert to action
A SIEM correlates several log events and raises an alert: a user account has logged in from an unusual location and then accessed a sensitive system. That is detection done. What follows is where SOAR earns its place.
Without automation, an analyst manually gathers context on the account, checks the address against threat intelligence, opens a ticket, and decides what to do, all of which takes time. With a SOAR playbook, those enrichment and triage steps run automatically the moment the alert fires, and the analyst is presented with a decision rather than a research task. If the playbook is confident, it can even begin containment, such as disabling the account, subject to the approval gates the team has set. SIEM found the problem; SOAR accelerated the response.
Which products are SIEM and which are SOAR?
Some products specialise, and some combine both. Microsoft Sentinel is a SIEM with built-in SOAR-style playbooks. Splunk offers both Splunk Enterprise Security (SIEM) and Splunk SOAR (formerly Phantom). Palo Alto pairs Cortex XSIAM and Cortex XSOAR. CrowdStrike offers a next-generation SIEM with automation.
The market is converging, with many platforms now bundling detection and automated response together. When comparing options, the useful questions are whether the platform can correlate the log sources you need for detection, and whether its automation can orchestrate the tools you already use for response.
Do you need both, and how they converge
You generally need detection before automation is useful, so a SIEM or an equivalent detection capability tends to come first. SOAR adds most value once alert volume is high enough that automating triage and response saves meaningful analyst time and reduces mean time to respond.
Increasingly the two are delivered together in a single platform, and a well-run security operations centre uses them as a pipeline: detection flows straight into automated enrichment, triage and response, so genuine threats are acted on in minutes rather than sitting in a queue. The combination is what turns raw log volume into fast, consistent action.
Not sure which you need?
The right detection stack depends on your environment, your team and your risk. Precursor operates managed soc from a CREST-accredited security operations centre, so you get the outcome rather than another tool to run.
SIEM vs SOAR, answered
Common questions about how SIEM and SOAR differ and relate.
No. They do different jobs at different stages. SIEM detects threats by correlating logs; SOAR automates the response to what SIEM finds. They are complementary, and many organisations use them together as a detection-to-response pipeline.
You need detection before automation is useful, so SIEM (or an equivalent detection capability) generally comes first. SOAR adds most value once you have enough alert volume that automating triage and response saves meaningful analyst time.
SIEM answers what is happening by correlating log data into alerts. SOAR answers what to do about it by automating and coordinating the response through playbooks. One improves visibility; the other improves speed of action.
CrowdStrike offers a next-generation SIEM as part of the Falcon platform, with automation capabilities. It is primarily known for endpoint detection and response, and it has extended into SIEM and broader detection. It is not marketed principally as a standalone SOAR, though its platform includes automation.
Microsoft Sentinel is a cloud-native SIEM with built-in SOAR capabilities, delivered through automation playbooks. So it spans both: it detects threats by correlating logs like a SIEM, and it automates response through playbooks like a SOAR, within one platform.
Yes. Splunk offers both as distinct products: Splunk Enterprise Security is its SIEM, and Splunk SOAR (formerly Phantom) is its security orchestration, automation and response platform. They are commonly used together, with the SIEM detecting and the SOAR automating the response.
SIEM is evolving rather than being replaced. Next-generation and cloud-native SIEM platforms add behavioural analytics, automation and XDR-style correlation. SOAR complements SIEM by automating response, but does not replace the detection and log-retention roles a SIEM performs.