Nmap Version Scan

After waiting for an additional hour, the attacker is back once again with an Nmap version scan against TCP port 80. The attacker remembers from the SYN scan that there is a server listening on this port, and would therefore like to know more information about this server.

Starting Nmap 4.01 ( http://www.insecure.org/nmap/ ) at 2007-03-05 20:40 EST Interesting ports on 71.157.X.X: PORT STATE SERVICE VERSION 80/tcp open http Apache httpd

Nmap finished: 1 IP address (1 host up) scanned in 6.957 seconds

The Apache webserver is bound to TCP port 80. The mere act of establishing a TCP connection with the target over port 80 in and of itself does not indicate any suspicious activity. From the transport layer and below, the connection appears benign, and iptables does not log anything. However, blind FIN packets, as we will see in the next example, are a different story.

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