(ISC)2 Certified in Cybersecurity Practice Exam

What is a rootkit?

1. A type of anti-virus software.

2. Software designed to hide its presence while allowing unauthorized access.

3. A security feature for protecting user passwords.

4. A system for managing software updates safely.

The correct answer is: Software designed to hide its presence while allowing unauthorized access.

A rootkit is a type of software specifically created to conceal its existence or the existence of other software on a system while enabling unauthorized access. The primary purpose of a rootkit is to allow an attacker prolonged control over a system without detection. It often targets low-level operations in the operating system, allowing it to hide files, processes, and system data crucial for maintaining stealth. This capability makes rootkits particularly dangerous because they can maintain access to compromised systems while bypassing traditional detection mechanisms. The other choices do not align with the function of a rootkit. Anti-virus software is designed to detect and remove malicious software, not hide it. Security features for protecting user passwords refer to measures like encryption or secure storage, which aren't related to unauthorized system access. Similarly, a system for managing software updates safely pertains to keeping software current and secure rather than providing covert access to a system. Thus, option B accurately captures the essence of what a rootkit is and its malicious intent.