3.14.5Scan on schedule and in real time in Rev. 3

Malicious code insertions occur through the exploitation of system vulnerabilities. Malicious code can be inserted into the system in a variety of ways, including email, the internet, and portable storage devices. Malicious code includes viruses, worms, Trojan horses, and spyware. Malicious code can be encoded in various formats, contained in compressed or hidden files, or hidden in files using techniques such as steganography. Malicious code may be present in commercial off-the-shelf software and custom-built software and could include logic bombs, backdoors, and other types of attacks that could affect organizational mission and business functions. Periodic scans of the system and real-time scans of files from external sources as files are downloaded, opened, or executed can detect malicious code. Malicious code protection mechanisms can also monitor systems for anomalous or unexpected behaviors and take appropriate actions. Malicious code protection mechanisms include signature- and non-signature-based technologies. Non-signature-based detection mechanisms include artificial intelligence techniques that use heuristics to detect, analyze, and describe the characteristics or behavior of malicious code and to provide controls against such code for which signatures do not yet exist or for which existing signatures may not be effective. Malicious code for which active signatures do not yet exist or may be ineffective includes polymorphic malicious code (i.e., code that changes signatures when it replicates). Non-signature-based mechanisms include reputation-based technologies. Pervasive configuration management, anti-exploitation software, and software integrity controls may also be effective in preventing unauthorized code execution. If malicious code cannot be detected by detection methods or technologies, organizations can rely on secure coding practices, configuration management and control, trusted procurement processes, and monitoring practices to help ensure that the software only performs intended functions. Organizations may determine that different actions are warranted in response to the detection of malicious code. For example, organizations can define actions to be taken in response to the detection of malicious code during scans, malicious downloads, or malicious activity when attempting to open or execute files.