CompTIA CASP+ Practice Test 2025 - Free CASP+ Practice Questions and Study Guide

A packet analyzer is the most suitable tool for identifying the behavior of a stealth Trojan. This type of malware often operates covertly, attempting to evade detection by traditional security measures. A packet analyzer captures and inspects data packets traveling over the network, allowing for the monitoring of unusual or suspicious traffic patterns that could indicate the presence of a stealth Trojan.

Unlike traditional antivirus software, which primarily relies on known signatures and can miss new or modified threats, a packet analyzer provides deeper insights into network behavior and connections, helping to uncover anomalies that might suggest malicious activity. It can identify unauthorized data transmissions or connections to command-and-control servers, which is a common behavior of stealth Trojans trying to exfiltrate data or receive further instructions.

Other tools, such as a network firewall, help to enforce security policies by allowing or blocking traffic based on predefined rules, but they may not provide the detailed behavioral analysis necessary to detect stealthy malware. Similarly, a system performance monitor can offer insights into system resource usage but doesn’t specifically track network behavior or identify hidden malicious activities. Therefore, for understanding and identifying the actions of a stealth Trojan, using a packet analyzer is the most effective approach.