Information Systems Audit: for Beginners

Explore how top management involvement shapes business strategy by evaluating corporate governance policies and planning processes; examine policies, procedures, segregation of duties, and business continuity plans for technology department management.

Explore corporate governance as the set of responsibilities guiding management to provide strategic direction, achieve goals, and manage risks and resources, including relationships with the board and shareholders.

Drive IT governance by aligning with stakeholders to generate value, manage risk, maintain an up-to-date inventory of IT resources, and protect confidentiality, integrity, and availability through compliance and information security.

Explore how high-level policies reflect corporate philosophy, guide information system controls, and serve as a benchmark for audits, reviews, and updates to support business objectives.

Information security policies communicate standards to users and technical staff, are approved by management, documented and communicated to employees and service providers, used by auditors as a frame of reference.

Define information security, scope, and objectives; state management's intent; outline risk-based controls, compliance, training, and continuity; assign responsibilities and ensure accessible, understandable policy documentation referencing ISO 271 and ISO 27072.

Audit the information security policy by evaluating its basis in risk management, relevance, content, exceptions, approval and implementation processes, effectiveness, and its review, update, awareness, and training.

Define and document procedures to meet policy objectives; ensure clear, specific guidance for relevant users, while systems auditors review, evaluate, and test controls over business processes.

Examine how recruitment, selection, training, and promotion policies affect system performance, and how employee manuals, codes of conduct, ethics, benefits, vacation rules, and evaluations guide duties and fraud detection.

Identify and document job function relationships in the IT department to assess segregation of duties, and apply compensatory controls—such as audit trails, reconciliation, and supervisory reviews—when segregation is not feasible.

Enforce segregation of duties with transaction authorization, asset custody, data access controls, and formal authorization forms, while the data owner determines access levels and periodic audits detect unauthorized transactions.

Identify key business processes and establish a formal policy to recover operations, assign responsibilities for developing and testing the plan, and protect critical operations, resources, and assets, including the DRP.

Identify disasters and events that disrupt operations by rendering critical information and resources inoperative, including earthquakes, floods, tornadoes, fires, and hacker attacks or human error.

Explore the business impact analysis (BIA) as a core step in developing a business continuity plan, identifying critical processes, recovery time periods, resources, and interdependencies to guide technology choices.

Understand how information system operations and maintenance handle production changes through formal change control, user-driven requests, authorized approvals, testing, documentation, and audit-ready records.

Explore security controls that mitigate risks, including centralized port management with Active Directory group policy, desktop lockout, antivirus, secure removable storage, and RFID asset tracking.

Encrypts plain text into encrypted text using a key, enabling decryption back to plain text; protects data traveling through a network and stored information, and verifies transaction or document authenticity.

Implement a hardware maintenance program with routine cleaning, workload-driven maintenance, and supplier-guided scheduling, while auditing environmental control equipment and ensuring a formal, approved maintenance plan and timely, budget-conscious maintenance.

Assess hardware acquisition aligned with business plans, criteria, and cost-benefit analyses within the hardware review scope; monitor capacity and utilization reports, maintenance timing, problem logs, and overall system operations.

Audit operating system reviews by evaluating software selection procedures, feasibility study, cost-benefit analysis. Check data security controls, patch management, and change procedures to ensure maintenance aligns with it plans.

Audit database design and controls, verify ER diagram completeness, foreign keys, constraints, portability of interfaces, storage, primary keys, triggers, password policies, audit trails, and backup procedures for integrity and availability.

Assess network infrastructure controls in information systems audit for beginners by examining topology, components, use, personnel, user groups, transmission media, environmental and logical security measures, change requests, and monitoring.

Establish internal controls to maintain availability and restore critical processes after disruption, the disaster recovery plan guides backups and BIA to set RPO and OPO.

Identify recovery alternatives to support critical processes when normal facilities fail, including CITES facilities, mobile, warm, hot sites, reciprocal agreements, and duplicate sites, balancing recovery, cost, and impact.

Lay the foundation for effective information security management, protecting information assets from viruses, hackers, and remote access risks while aligning objectives for continuity, integrity, confidentiality, data protection, and compliance.

Explore how an information security management system (ISMS) provides a framework of policies, procedures, and controls based on ISO/IEC 27001 and 27002, emphasizing leadership, staff training, monitoring, and incident response.

Assess computer crimes and their impact on organizations, including financial losses, legal repercussions, and reputational damage, and identify attacker types such as hackers, script kiddies, crackers, employees, end users, and third parties.

Explore common attack methods such as alteration attacks, botnets, brute force, denial of service, eavesdropping, phishing, email spoofing, trojans, man-in-the-middle, and viruses.

Assess minimum security levels by maintaining a frequently updated inventory. Enable automatic malware protection, enforce regular password changes, automatic patches, disable unnecessary services, and conduct periodically tested backups.