Block WordPress brute force attacks with CSF

csf.conf

....

CUSTOM1_LOG = "/var/log/apache2/domlogs/*/*"

....

regex.custom.pm

#!/usr/local/cpanel/3rdparty/bin/perl
###############################################################################
# Copyright 2006-2016, Way to the Web Limited
# URL: http://www.configserver.com
# Email: sales@waytotheweb.com
###############################################################################

sub custom_line {
        my $line = shift;
        my $lgfile = shift;

# Do not edit before this point
###############################################################################
#
# Custom regex matching can be added to this file without it being overwritten
# by csf upgrades. The format is slightly different to regex.pm to cater for
# additional parameters. You need to specify the log file that needs to be
# scanned for log line matches in csf.conf under CUSTOMx_LOG. You can scan up
# to 9 custom logs (CUSTOM1_LOG .. CUSTOM9_LOG)
#
# The regex matches in this file will supercede the matches in regex.pm
#
# Example:
#       if (($globlogs{CUSTOM1_LOG}{$lgfile}) and ($line =~ /^\S+\s+\d+\s+\S+ \S+ pure-ftpd: \(\?\@(\d+\.\d+\.\d+\.\d+)\) \[WARNING\] Authentication failed for user/)) {
#               return ("Failed myftpmatch login from",$1,"myftpmatch","5","20,21","1");
#       }
#
# The return values from this example are as follows:
#
# "Failed myftpmatch login from" = text for custom failure message
# $1 = the offending IP address
# "myftpmatch" = a unique identifier for this custom rule, must be alphanumeric and have no spaces
# "5" = the trigger level for blocking
# "20,21" = the ports to block the IP from in a comma separated list, only used if LF_SELECT enabled. To specify the protocol use 53;udp,53;tcp
# "1" = n/temporary (n = number of seconds to temporarily block) or 1/permanant IP block, only used if LF_TRIGGER is disabled

# XMLRPC
if (($globlogs{CUSTOM1_LOG}{$lgfile}) and ($line =~ /(\S+).*] "\w*(?:GET|POST) \/\/?xmlrpc\.php.*" .*"-".* /)) {
return ("WP XMLPRC Attack",$1,"XMLRPC","100","80,443","1");
}

# WP-LOGINS
if (($globlogs{CUSTOM1_LOG}{$lgfile}) and ($line =~ /(\S+).*] "\w*(?:GET|POST) \/\/?wp-login\.php.*".* /)) {
return ("WP Login Attack",$1,"WPLOGIN","50","80,443","1");
}


# If the matches in this file are not syntactically correct for perl then lfd
# will fail with an error. You are responsible for the security of any regex
# expressions you use. Remember that log file spoofing can exploit poorly
# constructed regex's
###############################################################################
# Do not edit beyond this point

        return 0;
}

1;