An outbound TCP connection from a compromised web server to a single external IP on a non-standard high port such as 4444 is a classic reverse-shell indicator. Because the server initiates the connection, it can evade typical inbound firewall restrictions, allowing an attacker to receive a shell session through a listener on the command-and-control host. The repeated nature of the connections suggests beaconing for instructions, a hallmark of C2 communication.
Why this answer
Repeated outbound connections from an internal web server to an external server on TCP port 4444 strongly indicate a reverse shell, which is a common technique used by malware to establish command-and-control (C2) communication. Unlike a standard client-server model, the internal host initiates the connection to bypass firewalls that block inbound traffic, and port 4444 is frequently associated with Metasploit's default reverse shell payload (e.g., meterpreter). This behavior is anomalous for a web server, which typically serves HTTP/HTTPS on ports 80/443 and does not initiate persistent outbound connections to arbitrary external IPs on non-standard ports.
Exam trap
The key trap here is that candidates see 'connection attempts' and assume it is an inbound scan (Option C), but the question specifies the internal IP is the source, meaning the web server is initiating the connection, which is the hallmark of a reverse shell or C2 beacon. In CHFI, understanding traffic direction and common C2 port usage is critical.
How to eliminate wrong answers
Option A is wrong because HTTPS traffic is served on TCP port 443 by default, not 4444; while a server could be configured to use a non-standard port, a web server serving HTTPS would not repeatedly initiate outbound connections to an external server—it would listen for inbound connections. Option B is wrong because DNS queries use UDP port 53 (or TCP port 53 for zone transfers), not TCP port 4444, and DNS traffic is typically ephemeral and not characterized by repeated connection attempts to a single external IP. Option C is wrong because a port scan would originate from an external source targeting the internal web server, not from the internal web server to an external server; the log shows outbound connections from the internal host, indicating it is the initiator, not the target of a scan.