How does a rootkit pose a cybersecurity threat?

A rootkit poses a cybersecurity threat primarily because it is designed to gain and maintain elevated access to systems while hiding its presence. By obtaining deep control over an operating system, a rootkit can bypass normal security mechanisms, such as authentication controls and monitoring tools. This elevated access allows it to manipulate system settings, steal sensitive data, or introduce other malicious software without detection.

The threat is compounded by its stealthy nature; a rootkit can obscure its existence from security software and system administrators, making it much harder to identify and remove. Generally, systems compromised by rootkits can suffer from significant security violations, including unauthorized data access and the potential for further exploitation by other malware or cyber actors.

In contrast, options that suggest a rootkit improves system performance, installs new security software, or aids in data recovery do not align with the malicious intent and operational nature of rootkits. A rootkit does not enhance system efficacy or provide security functionalities; instead, it undermines the integrity of systems, making them more vulnerable to further attacks.