What is a rootkit?

A rootkit is indeed a type of malware that is specifically designed to gain unauthorized access to a computer system while concealing its presence. The unique characteristic of a rootkit is its ability to embed itself deeply into the operating system, making it difficult for users and traditional security software to detect and remove it. Rootkits can allow an attacker to maintain persistent control over a system, facilitating various malicious activities such as data theft or system manipulation without the knowledge of the system owner.

In contrast, other options do not accurately define rootkits. For instance, a tool for improving cybersecurity would focus on protecting assets and detecting intrusions, whereas rootkits primarily serve to compromise security. Similarly, a benign software with administrative privileges does not fit the definition, as rootkits are malicious rather than benign. Network monitoring software serves a different purpose and is generally used for security oversight rather than malicious control. Therefore, the selected definition clearly identifies rootkits as a deceptive and harmful category of malware.