Server Attack

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Hi someone is currently sending requests to our server 20x a second.

Here is what one of the logs look like.

[CODE]
Host: 84.77.19.46   /signUp.php?ref=1945777  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; MTQ; PPC Mac OS X; en-US) AppleWebKit/578.4
(KHTML, like Geco, Safari) OmniWeb/v643.68e=C:  

Host: 82.234.98.65   /signUp.php?ref=ec0lag  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; CDB; PPC Mac OS X; en-US) AppleWebKit/126.0
(KHTML, like Geco, Safari) OmniWeb/v554.35  

Host: 84.94.31.161   /signUp.php?ref=ec0lag  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; TLD; PPC Mac OS X; en-US) AppleWebKit/502.6
(KHTML, like Geco, Safari) OmniWeb/v401.63ive=C:  

Host: 81.49.24.92   /signUp.php?ref=1945777  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; SZS; PPC Mac OS X; en-US) AppleWebKit/230.1
(KHTML, like Geco, Safari) OmniWeb/v710.56ive=C:  

Host: 80.129.248.17   /signUp.php?ref=1945777  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; OST; PPC Mac OS X; en-US) AppleWebKit/243.6
(KHTML, like Geco, Safari) OmniWeb/v846.88  

Host: 87.235.49.194   /signUp.php?ref=ec0lag  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.1  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; SDD; PPC Mac OS X; en-US) AppleWebKit/430.1
(KHTML, like Geco, Safari) OmniWeb/v145.34  

Host: 125.129.12.61   /signUp.php?ref=1945777  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; WCG; PPC Mac OS X; en-US) AppleWebKit/455.3
(KHTML, like Geco, Safari) OmniWeb/v042.84stemDrive=\x81  

Host: 66.110.153.47   /signUp.php?ref=ec0lag  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; ZAM; PPC Mac OS X; en-US) AppleWebKit/387.2
(KHTML, like Geco, Safari) OmniWeb/v456.02ve=C:  

Host: 62.2.177.250   /signUp.php?ref=ec0lag  
  Http Code: 403  Date: Aug 27 17:44:38  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; LMZ; PPC Mac OS X; en-US) AppleWebKit/206.1
(KHTML, like Geco, Safari) OmniWeb/v204.07es  

Host: 200.115.226.143   /signUp.php?ref=1945777  
  Http Code: 403  Date: Aug 27 17:44:37  Http Version: HTTP/1.1  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; EDE; PPC Mac OS X; en-US) AppleWebKit/647.0
(KHTML, like Geco, Safari) OmniWeb/v760.47emDrive=C:\x81  

Host: 84.171.125.189   /signUp.php?ref=1945777  
  Http Code: 403  Date: Aug 27 17:44:37  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; QHA; PPC Mac OS X; en-US) AppleWebKit/778.0
(KHTML, like Geco, Safari) OmniWeb/v456.03=C:  

Host: 83.242.79.70   /signUp.php?ref=1945777  
  Http Code: 403  Date: Aug 27 17:44:37  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; GFS; PPC Mac OS X; en-US) AppleWebKit/537.0
(KHTML, like Geco, Safari) OmniWeb/v313.01rive=C:  

Host: 86.69.194.172   /signUp.php?ref=ec0lag  
  Http Code: 403  Date: Aug 27 17:44:37  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; ZCV; PPC Mac OS X; en-US) AppleWebKit/468.2
(KHTML, like Geco, Safari) OmniWeb/v026.14stemDrive=\x81  

Host: 196.203.176.26   /signUp.php?ref=ec0lag  
  Http Code: 403  Date: Aug 27 17:44:37  Http Version: HTTP/1.1  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; BXT; PPC Mac OS X; en-US) AppleWebKit/840.3
(KHTML, like Geco, Safari) OmniWeb/v767.50s  

Host: 201.41.241.190   /signUp.php?ref=1945777  
  Http Code: 403  Date: Aug 27 17:44:37  Http Version: HTTP/1.0  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0 (Macintosh; TYZ; PPC Mac OS X; en-US) AppleWebKit/742.0
(KHTML, like Geco, Safari) OmniWeb/v715.65C:  

Host: 200.84.144.234   /signUp.php?ref=ec0lag  
  Http Code: 403  Date: Aug 27 17:44:37  Http Version: HTTP/1.1  Size in
Bytes: -  
  Referer: -  
  Agent: Mozilla/5.0  
[/CODE]

We are currently blocking this user through our Apache.

.htaccess
[CODE]
RewriteEngine On 
RewriteCond %{HTTP_USER_AGENT} ^Mozilla/5\.0\ \(Macintosh;\ (.+)\ PPC\ Mac\
OS\ X;\ en-US\)\ AppleWebKit/(.+)\ \(KHTML,\ like\ Geco,\ Safari\)\
OmniWeb/v([0-9]+).([0-9]+)(.+)$
RewriteRule .* - [F]
[/CODE]

That works fine and is giving the user a 403 (Forbidden), but the problem is
that half of our Apache processes are from this user.

Is there a way to block his user agent before he gets to Apache? Sometimes
this brings our server to a crash.

Thanks
Andrew
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