DoS attacks from random IPs

I have a bunch of fake requests in my log:
216.187.83.13 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
128.12.102.49 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
128.12.102.49 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
66.185.84.68 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
66.185.84.68 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
24.67.253.203 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8862"
128.12.102.49 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
216.187.83.13 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
63.199.207.169 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
216.187.83.13 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"
12.228.167.15 - - [29/Mar/2003:19:01:52 -0800] "GET / HTTP/1.1" 403 428 "-" "Microsoft URL Control - 6.00.8169"

How can I stop these attacks? There are A LOT of them so I think that its a random generating IP attack of some sort

 

 

 

 

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