high cpu process

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Hy,
I'm use apache 2.2.2.
Casually I find which some process use very high cpu.
This is a "top"
> 21213 wwwrun    20   0  297m  18m 4660 R   98  0.5 100:05.76 httpd2-prefork                                                                                                     
> 21149 wwwrun    20   0  297m  19m 5180 R   96  0.5  97:15.34 httpd2-prefork                                                                                                     
> 20882 wwwrun    20   0  298m  19m 5464 R   95  0.5  96:38.06 httpd2-prefork                                                                                                     
> 20700 wwwrun    20   0  297m  20m 5880 R   94  0.5 101:04.42 httpd2-prefork

Cpu used for first reported process it's 98%.
There is a one way for know why this appear?
I think it's some attack or some process php but I can not trace the origin.

Thank you, Marco


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