200-201 Question 271
Single answerA cybersecurity analyst is investigating suspicious activity on the network and notices an unusual amount of outbound traffic from internal hosts to port 4444 on an external IP address. What is the most likely explanation for this behavior?
- A
Port 4444 is commonly used for secure web traffic, and this activity is likely legitimate.
- B
Port 4444 is a well-known port for malicious backdoor communication, and this could indicate a compromise.
- C
Port 4444 is commonly used for DNS traffic, and this activity is likely due to an internal DNS misconfiguration.
- D
Port 4444 is a reserved port for FTP communication, and the activity is part of regular file transfers.
Show answer and explanation
Correct answer: B
Explanation
Port 4444 is commonly associated with malicious backdoor communication, such as those used by trojans and remote access tools. When a cybersecurity analyst observes outbound traffic to port 4444, it is critical to investigate further as this could indicate a compromised system attempting to communicate with a command-and-control server. Understanding the significance of destination ports in network traffic analysis is essential for identifying potential threats.
- A. Incorrect.
Port 4444 is not associated with secure web traffic such as HTTPS, which typically uses port 443. This is an incorrect explanation.
- B. Correct.
Port 4444 is indeed a well-known port often used by malicious software, such as backdoors or remote control tools, for communication. Unusual traffic to this port could indicate a system compromise.
- C. Incorrect.
DNS traffic typically uses port 53, not port 4444. This is an incorrect explanation.
- D. Incorrect.
FTP communication commonly uses ports 20 and 21, not port 4444. This is an incorrect explanation.