What is the primary goal of Trojan malware?

The primary goal of Trojan malware is to create a backdoor for unauthorized access. Unlike other forms of malware that may focus on spreading or encrypting files, Trojans specifically disguise themselves as legitimate software or files to gain the trust of users. Once executed, a Trojan can give attackers remote access to the infected system, enabling them to control it without the user's knowledge. This access can be used for various malicious purposes, such as stealing sensitive information, deploying additional malware, or using the device as part of a botnet.

In contrast, while other options describe legitimate malware behaviors, they are not the primary function of Trojans. For instance, ransomware, which encrypts files for ransom, serves a different purpose. Similarly, viruses and worms are designed to replicate and spread to other systems, and network sniffing tools are intended to capture and analyze network traffic. However, these functions do not align with the fundamental operational design of Trojan malware.