What does malware do when installed on a system?

Malware, short for malicious software, is specifically designed to harm or exploit computers and systems. When installed on a system, malware can disrupt operations, damage data, steal sensitive information, or compromise the integrity of hardware. This harmful behavior aligns with the chosen answer, as its primary function is to create chaos and damage in various ways, whether by corrupting files, encrypting data for ransom, or causing system failures.

The other options describe functions that are either beneficial or protective, which do not align with the nature of malware. Enhancing the performance of hardware or ensuring data security suggests positive outcomes, while regularly updating software implies maintenance and support, which are not objectives of malware. Thus, the function of malware is correctly understood as being detrimental to systems and data.