Internal Audit Plan Template Iso 27001

SOP: Internal Audit Plan Template (ISO 27001:2022)

1. Document Control & Revision History

2. Executive Summary & Scope

Objective: This document establishes the mandatory framework for conducting internal audits of the Information Security Management System (ISMS) to ensure conformity with ISO/IEC 27001:2022 requirements and internal organizational policies.

Scope: This procedure covers all physical locations, logical infrastructure, cloud environments, and business processes defined within the Statement of Applicability (SoA). The audit shall verify the effectiveness of controls, identification of non-conformities, and the maturity of risk treatment plans.

3. Prerequisites & Tool Requirements

• Certifications: Lead Auditor (ISO 27001 LA) or equivalent internal competency certification.
• Access Permissions: Read-only access to the GRC (Governance, Risk, and Compliance) platform, SIEM logs, and Jira/Ticketing systems.
• Documentation: Current ISMS scope, SoA, Risk Register, and previous audit reports (for gap closure verification).
• Software: Secure documentation repository (e.g., SharePoint/Confluence), Audit Management Software, and encrypted communication channels.

4. Roles & Responsibilities (RACI Matrix)

(R=Responsible, A=Accountable, C=Consulted, I=Informed)

5. Step-by-Step Operational Procedure

Phase I: Planning & Scoping

• Define audit objectives, criteria, and timeframe based on risk-based priority.
• Notify all auditees via official memorandum at least 14 days prior to site/process entry.
• Review the last audit report to determine status of outstanding non-conformities.

Phase II: Fieldwork & Evidence Collection

• Conduct opening meeting to confirm scope and logistics.
• Gather evidence (Logs, policies, change requests, access reviews, training records).
• Perform walkthroughs of physical and logical security controls.
• Conduct interviews with process owners to confirm "as-performed" versus "as-documented" procedures.

Phase III: Reporting & Closure

• Draft preliminary audit findings and validate findings with process owners for factual accuracy.
• Submit the formal Internal Audit Report to the ISMS Steering Committee.
• Conduct the closing meeting to discuss remediation timelines and risk acceptance.

6. Quality Assurance & Verification Criteria

• Verification: All findings must be supported by objective evidence (e.g., screenshots, logs, email approvals). Verbal confirmations without supporting evidence are classified as "Observations," not "Non-Conformities."

7. Practical Troubleshooting Scenarios

Scenario A: Process Owner Refusal of Evidence Access

• Issue: Process owner denies access to sensitive HR/Financial systems citing "confidentiality" or "lack of time."
• Corrective Action: Escalate immediately to the Accountable executive (CISO/CTO). Document the refusal as a "Major Non-Conformity" regarding management cooperation with the internal audit process.

Scenario B: Evidence Inconsistency

• Issue: The stated procedure requires MFA for all users, but audit evidence shows 5% of service accounts bypass MFA without an approved risk exception.
• Corrective Action: Classify as a "Minor Non-Conformity." Request the auditee to provide the Risk Acceptance record or initiate an immediate remediation ticket in the GRC tool.

Scenario C: Evidence Integrity Compromise

• Issue: Audit logs provided for review show signs of manual tampering or gaps in sequence.
• Corrective Action: Cease audit of that specific control. Flag as a "Critical Security Incident." Report to the Security Operations Center (SOC) for forensic analysis of the logging infrastructure.