Adam works as a Security Analyst for Umbrella Inc. Company has a Windows-based network. All computers run on Windows XP. Manager of the Sales department complains Adam about the unusual behavior of…

Cheops-ng is a legitimate open-source network management and topology mapping tool used by administrators, not a Trojan, and would not open those ports or cause the observed symptoms.

Elsave is a benign command-line utility designed to read and clear Windows Security event logs for administrative purposes, not a Trojan, and would not produce remote-access behavior or open ports 12345, 12346, or 20034.

NetBus is a well-known RAT that listens on TCP ports 12345, 12346, and 20034, which matches the ports found open by the port scanner. It includes remote-control features that allow an attacker to display images on the victim's screen, explaining the appearance of unexpected pornographic content. NetBus also writes Windows registry run keys to ensure it launches automatically at startup, directly corresponding to the registry tampering Adam discovered.

NetStumbler is a legitimate wireless network scanning tool used to detect nearby Wi-Fi access points, not malware, and would not install itself via registry keys or open the observed ports.