Policy VNC server response

[hchlai () netscape net (Hin)]

Hi Snorters, 

A quick question on the below signature. From what I understand, the below signature will detect the response traffic 
of a VNC server, which means the source address of the alert should be where the VNC server is, right? 
What would the reason be if I see the VNC server in the destination address field of the alert?

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"POLICY VNC server response"; flow:established; content:"RFB 0"; 
depth:5; content:".0"; depth:2; offset:7; classtype:misc-activity; sid:560; rev:6;)

Hin

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