Negate Content - Snort Rules

[João Pedro Lola via Snort-sigs <snort-sigs () lists snort org>]

Hello All,

In a snort rule, why can´t i have two negate contents and third not negate content? If i can, how do I write it to work?

Example:

alert tcp $HOME_NET $HTTP_PORTS -> $EXTERNA_NET $HTTP_PORTS (
msg:"a message...";
 flow:stateless;
content:!"|76 69 64 65 6f 2f 6d 70 65 67|"; offset:13; depth:10;
content:!"|61 75 64 69 6f 2f 6d 70 65 67|"; distance:1; within:10;
content:"|61 75 64 69 6f 2f 6d 70 65 67|"; distance:1; within:10;
classtype:tcp-connection; sid:3024678; rev:1;)

Best Regards,
João Lola

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