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One step that might help is if your server can support it - a little help will come from banning IPs from the affected countries
I know that it isnt a perfect solution since the abusers can spoof ips and use proxies - but my server ONLY serves US Canada and northern Europe Ive blocked many of the suspect countries by IP at the firewall.
A number of years back ( 5 ) the server that I shared at that time was compromised with Iframe injection attacks. That server was behind on kernel updates and had a number of other weaknesses.
Do everything and anything you can to protect yourself from these problems. Firewall, ip blocks, port scanning detection, LFD detection etc
One final note - if you are on shared hosting, meaning you are on a VPS or one of thousands of accounts on a server that advertises as "unlimited everything" for $3 a month. You are then subject to the weaknesses that such a monster server has to be configured for. You are getting what you pay for. If anyone of your "roommates" on that server gets exploited then your site is more likely to be effected by that exploited neighbor.
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