In order to know what service is running on port 445, we'll perform a port scan.
sudo nmap -T5 -sCV <target_ip>
-T5 is the aggressiveness level. 5 is the highest and 0 is the softest.
-sCV refers to Nmap scripts. 'C' stands for the most commonly used scripts, while 'V' are the scripts that provide service information for each port.