Dos bufer overflow snort rule

[‫moon sun‬ ‫ via Snort-users <snort-users () lists sourceforge net>]

Hello,
Is this snort rule correct for detecting dos bufer overflow attack ? :

alert tcp !$HOME_NET any -> $HOME_NET 80 (flags: S; msg:"Possible TCP DoS"; flow: stateless; threshold: type both, 
track by_src, count 70, seconds 10; sid:10001;rev:1;)

And what is the tcp header features that included in Dos attack ? such as  service type : http , port: 80  and the 
count , and what else ?
Thanks
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