Threat intelligence is the most helpful method for protecting an enterprise from advanced persistent threats (APTs), as it provides relevant and actionable information about the sources, methods, and intentions of the adversaries who conduct APTs. Threat intelligence can help to identify and anticipate the APTs that target the enterprise, as well as to enhance the detection, prevention, and response capabilities of the information security program. Threat intelligence can also help to reduce the impact and duration of the APTs, as well as to improve the resilience and recovery of the enterprise. Threat intelligence can be obtained from various sources, such as internal data, external feeds, industry peers, government agencies, or security vendors.

The other options are not as helpful as threat intelligence, as they do not provide a specific and timely way to protect the enterprise from APTs. Updated security policies are important to establish the rules, roles, and responsibilities for information security within the enterprise, as well as to align the information security program with the business objectives, standards, and regulations. However, updated security policies alone are not enough to protect the enterprise from APTs, as they do not address the dynamic and sophisticated nature of the APTs, nor do they provide the technical or operational measures to counter the APTs. Defined security standards are important to specify the minimum requirements and best practices for information security within the enterprise, as well as to ensure the consistency, quality, and compliance of the information security program. However, defined security standards alone are not enough to protect the enterprise from APTs, as they do not account for the customized and targeted nature of the APTs, nor do they provide the situational or contextual awareness to deal with the APTs. Regular antivirus updates are important to keep the antivirus software up to date with the latest signatures and definitions of the known malware, viruses, and other malicious code. However, regular antivirus updates alone are not enough to protect the enterprise from APTs, as they do not detect or prevent the unknown or zero-day malware, viruses, or other malicious code that are often used by the APTs, nor do they provide the behavioral or heuristic analysis to identify the APTs. References =

CISM Review Manual, 16th Edition, ISACA, 2022, pp. 211-212, 215-216, 233-234, 237-238.

CISM Questions, Answers & Explanations Database, ISACA, 2022, QID 1021.

Advanced Persistent Threats and Nation-State Actors 1

Book Review: Advanced Persistent Threats 2

Advanced Persistent Threat (APT) Protection 3

Establishing Advanced Persistent Security to Combat Long-Term Threats 4

What is the difference between Anti - APT (Advanced Persistent Threat) and ATP (Advanced Threat Protection)5