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There is no single free tool that replaces every kind of Sysmon telemetry. Choose based on what you need: Windows Security audit policies for selected native events, osquery for scheduled SQL-based monitoring of system state, Wazuh for centralized collection and analysis, or NXLog for collecting and forwarding logs. On Windows 11 and Windows Server 2025, Microsoft also documents Sysmon as an optional built-in feature, so check whether you can use Sysmon itself before switching.
First, identify what you want to replace
Sysmon is a telemetry producer: a Windows service and device driver that logs selected activity to Windows Event Log. Its event catalog includes process, network, file, and registry activity, with configuration rules controlling what is included or excluded. It does not analyze events, generate alerts, or block activity; those jobs require a separate collection or analysis layer. Microsoft’s Sysmon documentation describes the event model and configuration.
The alternatives below operate at different layers. A policy that generates selected Windows Security events is not the same as a query agent, and neither is the same as a centralized log-analysis platform. Pick the layer that addresses your actual gap.
| Option | Best fit | How it differs from Sysmon |
|---|---|---|
| Windows Security audit policy | Selected native process, account, policy, file, or registry auditing | Policy-driven events in the Security log, not Sysmon’s broader event catalog. |
| Process command-line auditing | Process creation records that include command lines | Focused on Security event 4688 rather than multiple Sysmon event families. |
| osquery | SQL queries and scheduled monitoring of selected system state or changes | Query and polling model; it is not the same as a continuous low-level event stream. |
| Wazuh | Centralized Windows log collection, parsing, rules, and alerts | An endpoint and analysis platform that can collect Sysmon events; it does not automatically replace the event source. |
| NXLog Agent | Collecting and forwarding Windows events to another destination | A collector and forwarder; its coverage depends on the underlying event sources. |
| Built-in Sysmon | Using Sysmon on supported Windows releases without the standalone installation path | Still Sysmon, not an alternative; availability depends on the OS and feature state. |
Use Windows Security auditing for selected native events
Windows advanced audit policy provides categories including Detailed Tracking, Logon/Logoff, Object Access, Policy Change, and System. Detailed Tracking includes process creation and termination. Object Access policies can cover file systems, registry keys, shares, and other objects. For auditing access to a particular file or registry object, enabling a subcategory alone may not be enough: configure the appropriate system access control list (SACL) on that object.
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Audit policy is a practical starting point when you need selected native events and want to avoid adding a separate event-generation agent. Its coverage is policy-selected, not a promise of Sysmon parity. Configure only the behaviors you need: broad auditing can produce excessive entries. Microsoft’s advanced security audit policy reference lists the available categories and subcategories.
Enable process creation and command lines
For process creation records, Windows writes Security event 4688 when process creation auditing is configured. To include command lines, enable the separate policy for including command lines in process-creation events. These settings are not active by default in the cited configuration guidance.
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- Open the applicable audit policy management tool, such as Local Security Policy or Group Policy, and enable Audit Process Creation under Detailed Tracking.
- Enable Include command line in process creation events in the audit policy settings.
- Start a test process, then check the Windows Security log for event 4688 and verify that the command-line field is present.
- Ensure your log collector or monitoring workflow actually collects the Security channel.
Exact policy paths and deployment methods can vary by Windows edition and whether the device is managed locally or through domain policy. Microsoft documents the setting and its Security event behavior in its command-line process auditing guidance.
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Osquery represents operating-system information as tables that can be queried with SQL. You can schedule queries to report selected state and changes, such as process inventory, listening ports, sessions, or scheduled tasks. This is useful when you want targeted, queryable visibility rather than a broad stream of Sysmon-style events.
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The trade-off is that coverage depends on the tables and queries you choose, their schedule, and how results are routed. A query that reports only newly added rows can miss a short-lived process that starts and exits between polls. An NXLog osquery integration example uses a 30-second interval for a process example and 60 seconds for listening ports; those are example configurations, not universal recommendations. Osquery is therefore not a one-for-one replacement for Sysmon’s event-generating service and driver.
Use Wazuh when you need central collection and analysis
Wazuh can collect Windows event channels, including System, Application, and Security by default, with additional channels configurable. Its documentation also shows collection of Microsoft-Windows-Sysmon/Operational. Wazuh decoders normalize events, and rules can trigger alerts, making it a broader collection and analysis option than an event source alone.
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That same ability to collect Sysmon logs makes Wazuh a complement to Sysmon as well as a possible broader platform choice. If you remove Sysmon, Wazuh can only analyze the event sources that remain enabled and collected; it does not create all of Sysmon’s telemetry by itself. Wazuh’s documented archive index is disabled by default because retaining all received events requires substantial storage. Plan for agent deployment, central components, rule configuration, retention, and administration rather than treating it as a zero-effort substitute. See the Wazuh installation guide for documented deployment approaches.
Use NXLog to collect and forward the events you have
NXLog Agent’s Windows documentation covers Windows Event Log and ETW collection, as well as PowerShell, registry, and file-integrity monitoring use cases. It can route relevant records to another system, but the data still has to come from an enabled source. For example, it can forward events from Windows audit policy or Sysmon; forwarding does not itself make NXLog a like-for-like Sysmon event generator.
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Before choosing a collector, identify the channels and sources you need, the destination format, and how the receiving system will parse and retain the records. Confirm current edition and licensing terms directly with the vendor before making a cost decision; the cited technical documentation does not establish a universal free-license claim.
Check whether Sysmon is already available in Windows
Microsoft documents Sysmon as an optional built-in feature for Windows 11 and Windows Server 2025. It remains disabled until enabled, and Microsoft says built-in and standalone Sysmon cannot coexist on the same device. Check the target release and whether the feature is present before installing an alternative. Microsoft also documents that built-in Sysmon is serviced through Windows quality updates.
There is an integration detail for international deployments: the rendered event display text for built-in Sysmon is localized, while the underlying XML event data remains consistent. Tools that parse rendered messages may need adjustment on non-English systems. Consult Microsoft’s optional Sysmon feature documentation and Sysmon guidance for current enablement and coexistence details.
Choose by monitoring goal
- Selected native process, file, registry, or policy events: start with Windows Security audit policy and validate that the resulting events answer your question.
- Process command lines: configure process creation auditing and command-line inclusion, then verify event 4688 and Security-log collection.
- Scheduled visibility into chosen system state: use osquery, designing query schedules and change reporting around the activity you need to catch.
- Centralized collection, parsing, and alerting: consider Wazuh, with an explicit plan for event sources, deployment, storage, and rules.
- Forwarding multiple Windows sources elsewhere: consider NXLog, while naming and enabling the event generators that supply its data.
- Windows 11 or Windows Server 2025: check the optional built-in Sysmon feature before replacing Sysmon with a different tool.
There is no universal winner or apples-to-apples coverage benchmark established for these options. The right choice depends on event detail, collection model, analysis needs, deployment effort, and log volume.
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