VNC Failed Login

[sekure <sekure () gmail com>]

Saw a warning on isc.sans.org about brute force VNC login attempts and
couldn't really find any rules to detect it, so I threw together this
one:

alert tcp $HOME_NET 5900 -> $EXTERNAL_NET any (msg:"VNC Failed Login";
flow:to_client,established; content:"|00 00 00 00 00 01 00 00 00 16|";
content:"Authentication|20|failure"; classtype:unsuccessful-user;
sid:1000001; rev:1;)


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