>Out of curiosity, why is this called Blacknurse?
I can only guess that it's a play on "black hat" hacking as opposed to "white hat"[1].
Since ICMP messages are related to network "health" by way of pinging & diagnostics, a good "white nurse" would use that to monitor the health of the patient. However, an evil "black nurse" would use the ICMP protocol against the patient to kill it.
[1]https://en.wikipedia.org/wiki/White_hat_(computer_security)