[help] attack on one of my client site

my server is overloading when i check apache status in WHM, there're thousands request like this

54-0 5203 0/24/24 W 0.01 12 0 0.0 0.01 0.01 221.217.186.140 forum.clientdomain.com GET /?***-HOLE-***-HOLE.GoToHell HTTP/1.1
55-0 5204 0/19/19 W 0.00 1 0 0.0 0.00 0.00 82.205.193.149 forum.clientdomain.com GET /?***-HOLE-***-HOLE.GoToHell HTTP/1.1
56-0 5205 0/19/19 _ 0.00 17 0 0.0 0.00 0.00 202.180.83.6 taurus.clientdomain.com GET /suspended.page/?***-HOLE-***-HOLE.GoToHell HTTP/1.1
57-0 5206 1/20/20 K 0.00 3 0 0.0 0.00 0.00 82.205.199.46 taurus.clientdomain.com GET /suspended.page/?***-HOLE-***-HOLE.GoToHell HTTP/1.1
58-0 5207 0/20/20 W 0.03 12 0 0.0 0.02 0.02 58.147.131.34 forum.clientdomain GET /?***-HOLE-***-HOLE.GoToHell HTTP/1.1
59-0 5208 0/22/22 W 0.00 25 0 0.0 0.00 0.00 212.138.47.24 forum.clientdomain GET /?***-HOLE-***-HOLE.GoToHell HTTP/1.0
any idea how to block ? i have installed mod security but seems its not help me

 

 

 

 

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