Wazuh for healthcare

For an addressable implementation specification, the HIPAA Security Rule does not allow a covered entity to skip the control. The entity must first assess whether the specification is reasonable and appropriate in its own environment. If it is not, the entity documents why and implements an equivalent alternative measure, provided that alternative is reasonable and appropriate. This sequence comes from 45 CFR 164.306(d). Appendix A to Subpart C lists 36 implementation specifications: 14 are required and 22 are addressable. The technical safeguards in 45 CFR 164.312 carry 7 specifications, and the addressable ones include automatic logoff and both encryption specifications. Each Wazuh setting tied to those specifications therefore needs a recorded decision, not just a configured default.

Encryption of data in transit between Wazuh agents and the Wazuh server is the first place where that decision shows up in the monitoring design. Confirm how agent-to-server communication is protected in the Wazuh release you deploy, which key material is used, and who can read the agent and server configuration. If the transport protection you choose meets the intent of the specification, record that assessment and keep it with the system documentation. If your assessment finds a gap, such as an agent network segment that cannot carry the protected channel, the documented alternative might be network isolation of that segment or a compensating control. That alternative must be tested and described, and it changes what you monitor, because the scope now includes the isolation controls as well as the agents.

Automatic logoff is addressable, so an entity may decide that a different mechanism is reasonable. Many Windows clinical workstations apply session timeouts through group policy. Wazuh can then play a monitoring role by collecting logon and logoff events from the agent and alerting when sessions run longer than your documented standard or when a timeout control is disabled. Confirm which Windows event IDs your agent collects, whether your decoders and rules map them to alerts, and who receives those alerts. Illustratively, if the organization decides that logoff is enforced by policy and Wazuh only detects deviations, the scope includes the policy objects and the alert rules, and the written decision should name both.

Log retention is the setting most often treated as a default, and it deserves the same discipline. How long the Wazuh indexer keeps alerts, and whether older data moves to an archive you control, determines what evidence exists when an incident or an assessment arrives. The Security Rule does not give Wazuh a retention period, so the retention decision belongs to your policy, your legal advice and your records obligations. Document the chosen period, the reason it is reasonable for your ePHI systems, and how it is enforced. Then test that the retained data can be searched and restored, because a retention rule that cannot be restored does not support an investigation.

A partner can prepare the analysis for each addressable specification, including the configuration evidence, the draft rationale and the list of alternatives considered. The decision, its documentation and its ownership remain with the covered entity. Leadership, the privacy and security officials and the system owners must review and sign off on each choice, and they must revisit it when the Wazuh configuration changes or when rules change. HHS proposed a major Security Rule revision on 6 January 2025, and as of October 2026 no final rule has been published, so treat today's assessments as dated records to be reviewed. No HIPAA certification exists for these decisions, and an independent auditor or HHS, not the implementation partner, judges whether they hold up.

Before a hospital designs Microsoft 365 monitoring, it has to confirm which activity sources it can actually feed into Wazuh. Mail, shared files and collaboration tools can hold ePHI, so administrators and security staff need to know who did what in those services, when, and from where. Wazuh does not see Microsoft 365 activity simply because the tenant exists. Whatever reaches the Wazuh server must arrive through a log source, a collection method and a decoder that the team has verified, so the design starts with that inventory rather than with the alert rules.

Wazuh integrations for cloud and SaaS audit logs are a separate content area from the core endpoint and server monitoring described elsewhere on this page. The team should not assume that a Microsoft 365 integration exists, or that it covers every audit log category the hospital cares about. In the current Wazuh documentation, confirm which Microsoft 365 log sources and decoders are supported, which versions of the 4.14 release line include them, how each source is collected (for example, through a vendor API pull or another transport), and which fields the decoders extract. Record the answers against the specific tenant licensing and audit settings the hospital uses, since some log categories depend on the subscription tier.

The business associate angle changes what the hospital must be able to do with those logs. Where a vendor creates, receives, maintains or transmits ePHI on the hospital's behalf, a business associate contract under 45 CFR 164.314(a)(2)(i) must require the vendor to comply with the Security Rule and to report security incidents to the covered entity. Hospitals that rely on a hosted mail or collaboration provider should review the contract for incident notification duties, reporting timelines and the subcontractors involved. The detection pipeline has to make that reporting possible: alerts about suspicious mailbox rules, external sharing or sign-ins need a documented path to the people who can judge whether a vendor incident has occurred.

A practical check is to write down three things before any build work: the Microsoft 365 workloads that hold ePHI in the hospital's own use, the audit log sources the team has confirmed in Wazuh documentation for those workloads, and the gaps where a source is missing, delayed or only partly parsed. Gaps should be assigned an owner and a compensating control, such as a manual review step, a native vendor audit search, or a request to the vendor. Ask the implementation partner to show the decoder output on sample events from the hospital's tenant before any alert rule is written, so the team knows what the rules can and cannot see.

Treat the boundary of Wazuh's view as a documented risk, not a footnote. Security staff should be able to state which Microsoft 365 events are in scope for detection, which are retained only in the vendor's native audit tools, and who reviews each source during an investigation. Alongside that, record the business associate agreements that govern the same services, so that a finding in the detection pipeline leads to a clear decision about notifying the vendor or the covered entity. Confirm the current HIPAA Security Rule status with counsel as well, since the proposed revision published in January 2025 has not been finalized.