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Block xmlrpc.php on Apache for all Domains on Ubuntu

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I was having a very high CPU consumption on my Ubuntu server, and most of my Apache websites were down.

I just went to check the Apache logs on /var/log/apache2 and I saw that there was someone doing an xmlrpc attack on my WordPress sites.

54.38.157.178 - - [01/Oct/2018:11:28:18 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"
54.38.157.178 - - [01/Oct/2018:11:28:18 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"
54.38.157.178 - - [01/Oct/2018:11:28:19 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"
54.38.157.178 - - [01/Oct/2018:11:28:18 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"
54.38.157.178 - - [01/Oct/2018:11:28:18 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"
54.38.157.178 - - [01/Oct/2018:11:27:27 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"
54.38.157.178 - - [01/Oct/2018:11:27:54 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"
54.38.157.178 - - [01/Oct/2018:11:28:00 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"
54.38.157.178 - - [01/Oct/2018:11:27:30 +0200] "POST /xmlrpc.php HTTP/1.0" 500 556 "-" "Mozilla/4.0 (compatible: MSIE 7.0; Windows NT 6.0)"

The fastest way to stop it would be to just block that file on the Apache server.

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