full-disclosure - Re: how to detect DDoS attack through HTTP response analysis(throuput)

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Date: Mon, 27 Jun 2011 07:01:06 +0400
From: Kai <kai@...nn.net>
To: 김무성 <kimms@...osec.co.kr>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: how to detect DDoS attack through HTTP
 response analysis(throuput)

 Hi,

 its kinda <s>stupid</s> incorrect way of detecting ddos by reading http 
 responce.
 if server says error 408, it could be just a script which takes long to 
 complete. if there is some caching server, e.g. nginx, before actual web 
 server, e.g. apache httpd, then error 502 could be a result of any 
 apache death, not a ddos attack.
 but if you still want to monitor sites in such "unusual" way, and if 
 you have access to web-servers' serverstatus, you'd could parse them to 
 find out: amount of simultaneous requests; similar requests by IP; 
 similar requests by Requested Page; etc.

-- 
 Cheers,

 Kai

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