malicious code protection mechanism

A countermeasure capability — such as antivirus engines, signature-definition sets, heuristic/AI-based analyzers, reputation services, or software-integrity controls — deployed at system entry and exit points to detect, block, quarantine, or eradicate hostile software (viruses, worms, Trojans, spyware, logic bombs, and similar threats). Both signature-based and nonsignature-based technologies are covered by the term; nonsignature approaches include AI-driven heuristics that characterize malicious behavior for threats whose signatures do not yet exist. In authoritative frameworks (NIST SP 800-53 control SI-3, NIST SP 800-171, and CMMC), the term names a required, configurable, and continuously updated safeguard: organizations are expected to employ these mechanisms at information-system entry and exit points, update them as new releases become available, and configure them to perform both periodic and real-time scans. Because traditional mechanisms cannot always detect custom or polymorphic threats, complementary safeguards such as secure coding practices, configuration management, and trusted procurement are used alongside them.

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