NIST SP 800-53 Rev. 5 AU-11 — Audit Record Retention

What this control requires

Retains audit records for an organization-defined period to support after-the-fact investigations and meet regulatory or organizational retention requirements. This control supports the Audit Retention System capability within the Audit and Accountability family.

In plain English

Retains audit records for an organization-defined period to support after-the-fact investigations and meet regulatory or organizational retention requirements. In practice, this means you can prove you policy management-level controls on a defined cadence.

Why it matters

SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed.

What an auditor looks for

A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan.

Within Audit and Accountability, the assessor will trace your implementation back to the catalogue reference (Control AU-11) and look for objective evidence on the latest two assessment cycles.

How to implement

Logging Monitoring

AWS. Org-trail CloudTrail to a central log archive account, GuardDuty in every region, and Security Hub for cross-source correlation.

Azure. Pipe every diagnostic setting into a central Log Analytics workspace; onboard Microsoft Sentinel for SIEM/SOAR.

GCP. Aggregate audit logs in a dedicated logging project with sink to BigQuery; enable Security Command Center Premium and route findings to Chronicle SIEM.

Policy Management

Docs. Keep each policy in version-controlled Markdown alongside the code that implements it; ship a signed PDF snapshot at each annual review and link the SHA into the SoA.

Operational checklist

• Policy. Document the trigger, the owner and the cadence.
• Audit. Document the trigger, the owner and the cadence.
• Audit Record. Document the trigger, the owner and the cadence.
• System. Document the trigger, the owner and the cadence.
• Control. Document the trigger, the owner and the cadence.
• Scope: management, organization, system, records, audit records, retention, capability, accountability.

Evidence to collect

• Policy Document. A signed and version-controlled policy / standard / procedure document.

Signed policy or standard documents the safeguard. Focus: Audit Record Retention.

Common pitfalls

• Per-account logging that nobody stitches together at the org level — incidents that cross accounts go undetected for days.
• Policies that no engineer has read; the version in Confluence drifts from the version that's actually being enforced.

How it maps to other frameworks

Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit.

• NIST SP 800-171 Rev. 3 3.3.3 — Audit Record Generation
• HIPAA (45 CFR Part 164) 164.502(j)(2) — Disclosures by workforce members who are victims of a crime
• CIS Controls v8 8.1 — Establish and Maintain an Audit Log Management Process

Related controls in NIST SP 800-53 Rev. 5

• Control AU-12(1) — System-Wide And Time-Correlated Audit Trail
• Control AU-8 — Time Stamps
• Control AU-12(2) — Standardized Formats
• Control AU-6(4) — Central Review And Analysis
• Control AU-5(5) — Alternate Audit Logging Capability
• Control AU-14 — Session Audit

References

• NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
• Catalogue identifier: Control AU-11

Topics: governance risklogging monitoringlogging retentionpolicy management