Sites have been hacked :(

[rhonda427]

This morning I noticed a php script on one of my sites with functionality aimed at cracking passwords, and on two other sites programs containing Trojans. I have of course immediately deleted these files from the public_html folder.

Anyones with a idea about what else I should be looking at to make sure that there are no other damages?

I assume the possibility to upload files must be due to some kind of unsecure form?

Thanks for any help and ideas on how to prevent against this!

[pageoneresults]

These topics are showing up a bit more frequently these days.

It sounds like your server has been compromised. You'll need to lock down the server as there is most likely a hole there. If you are on some sort of commodity hosting plan on a shared IP, I'd be considering a new home.

The possibility to upload files is probably due to an open FTP port and a dictionary attack on the login. That is just one method. If your on a shared hosting plan with thousands of others, there is the probability that many of the others are in the same position as you. :(