What Is Malicious Code? Types, Examples & How to Protect Yourself

Malicious code refers to any program or script designed to harm a system, steal data, or disrupt operations, encompassing both direct attacks like viruses and backdoors, and vulnerabilities in legitimate code that attackers can exploit. It infiltrates through various channels, including first-party code, open-source dependencies, and container images, with AI coding agents presenting new risks by suggesting insecure patterns or introducing "hallucinated" dependencies. Detection requires a multi-layered approach that includes Static Application Security Testing (SAST) for first-party code, Software Composition Analysis (SCA) for open-source dependencies, and runtime monitoring for behavioral anomalies, while also addressing the noise from false positives through reachability analysis to refine the focus on actionable risks. Understanding the difference between malware, a subset of malicious code, and the broader category itself is crucial, as are strategies for prevention, such as input validation, dependency control, and automated scanning in CI/CD pipelines. AI-written code, like human-written code, necessitates thorough security scanning to prevent vulnerabilities, emphasizing the importance of comprehensive protection across the software development lifecycle.

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