What function do Backdoors serve in malware?

Backdoors in malware are designed to provide unauthorized access to a system without the need for standard authentication processes. This means that an attacker can bypass normal security measures and gain entry to a system, allowing them to manipulate, steal, or damage data at will.

The primary purpose of a backdoor is to create an entry point for the attacker that is hidden from normal detection methods. Once in, they can perform various malicious activities, such as installing additional malware, collecting sensitive information, or maintaining long-term access even if the initial infection is discovered and removed.

While other functions mentioned in the choices can be associated with various types of malware (such as ransomware, keyloggers, or viruses), the defining characteristic of backdoors remains the ability to circumvent authentication mechanisms, thereby granting attackers unwarranted control over the targeted system.