They try to inject scripts to able to send or show spam.
That is totally normal nowadays.
We continuously update our list of IP addresses automatically from different sources.
To contribute in this kind of problem, I've exposed an automatic updated list of known hacker IP's.
This list contains the latest 2378 IP-addresses.
Using this list of IP's, it can save you a lot of troubles. This file is free for downloading and distributing.
