IT asset inventory is the process of tracking and managing the financial, physical, licensing, and contractual aspects of IT assets throughout their life cycle1. IT assets include hardware, software, and network components that an organization values and uses to achieve its objectives2. A complete and accurate IT asset inventory can help an organization to optimize its IT budget, reduce security risks, ensure compliance, and improve performance3.
One of the best controls to enable an organization to ensure a complete and accurate IT asset inventory is performing network scanning for unknown devices. Network scanning is the process of identifying and collecting information about the devices connected to a network, such as their IP addresses, operating systems, open ports, services, and vulnerabilities4. Network scanning can help an organization to:
Discover and inventory all the IT assets on the network, including those that are unauthorized, unmanaged, or hidden Detect and remove any rogue or malicious devices that may pose a threat to the network security or performance Update and verify the asset inventory data regularly and automatically, and alert on any changes or discrepancies Support the asset lifecycle management and maintenance activities, such as patching, upgrading, or retiring assets5 References = IT Asset Valuation, Risk Assessment and Control Implementation Model, ITAM: The ultimate guide to IT asset management, Navigating Security Threats with IT Inventory Management, Network Scanning - Wikipedia, 8 Best IT Asset Management Software (2024)

The most effective way for a large and diversified organization to minimize risk associated with unauthorized software on company devices is to scan end points for applications not included in the asset inventory. An asset inventory is a document that records and tracks all the hardware and software assets that are owned, used, or managed by the organization, such as laptops, tablets, smartphones, servers, applications, etc. An asset inventory helps to identify and classify the assets based on their type, model, location, owner, status, etc.
An asset inventory also helps to monitor and control the assets, such as enforcing security policies, applying patches and updates, detecting and resolving issues, etc. Scanning end points for applications not included in the asset inventory helps to minimize the risk of unauthorized software, because it helps to discover and remove any software that is not approved, authorized, or licensed by the organization, and that may pose security, legal, or operational risks, such as malware, spyware, pirated software, etc. The other options are not as effective as scanning end points for applications not included in the asset inventory, although they may provide some protection or compliance for the software assets. Prohibiting the use of cloud-based virtual desktop software, conducting frequent reviews of software licenses, and performing frequent internal audits of enterprise IT infrastructure are all examples of preventive or detective controls, which may help to prevent or deter the installation or use of unauthorized software, or to verify or validate the software assets, but they do not necessarily discover or remove the unauthorized software. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.2.1, page 3-11.

The best course of action in responding to the internal audit inquiry is to provide justification for the lower risk rating. This would demonstrate that the risk record was updated based on a valid and documented rationale, such as changes in the risk environment, risk drivers, risk indicators, or risk responses. Providing justification would also help to maintain the transparency and accountability of the risk management process, and ensure that the internal audit is satisfied with the risk assessment outcome. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 4, Section 4.2.3, page 184.

The potential impact of events is the estimated magnitude and likelihood of the consequences that may result from a risk scenario. The potential impact of events can help key stakeholders understand the severity and urgency of the risk, and prioritize the appropriate response actions. The potential impact of events can be expressed in quantitative or qualitative terms, such as financial loss, operational disruption, reputational damage, legal liability, etc. The potential impact of events is the most important information to include when reporting on an increasing trend of ransomware attacks in the industry, as it can help stakeholders assess the level of risk exposure and the adequacy of the existing controls. References = Risk and Information Systems Control Study Manual, Chapter 2: IT Risk Assessment, Section 2.3: Risk Analysis, p. 87-89.

Identifying specific risk events provides the foundational input for creating relevant and actionable risk scenarios. These scenarios form the basis of assessing potential impacts and determining effective controls.
This is a key step in theRisk Identification and Assessmentprocess.