DDoS Attack

[Steven Shepherd <steven () valueweb com>]

Our parent company is experiencing a very odd/severe DDoS attack coming 
from all over the place.  For the most part, the attack is occuring at 
the Apache level.  Log files show this request:

[Tue May 20 09:13:33 2003] [error] [client 194.xxx.xxx.xxx] request
failed: erroneous characters after protocol string: -nb GET
!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!-nb 
GET 
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@-nb 
GET 
!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!^&!*&!%&!%!@#%!^@)&!-nb 
GET +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + 
+ATH0+ + +ATH0+ + +ATH0+ + +\x01TH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ 
+ +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ + +ATH0+ 
+ +ATH0+

Scans of some of the attacking IP's show BackOrifice installations.

Has anyone had this sort of attack and what would be the best way to 
combat it?  Not much luck from the upstream(s) thus far.



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