Making sure your permissions are sane is a big step. There are several articles on D.O detailing ways to hack-proof and spam-proof your site.
 
Nancy
Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.

From: Anthony <tony@tony-mac.com>
To: support@drupal.org; Ms. Nancy Wichmann <nan_wich@bellsouth.net>
Sent: Monday, April 30, 2012 1:36 PM
Subject: Re: [support] Strange characters in source of block

What do you suggest?


3) Hackers could have picked up the IP, or even accidentally discovered it.

The third thing is going to happen sooner or later, so be ready.
 
Nancy
Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.

From: Anthony <tony@tony-mac.com>
To: support@drupal.org
Sent: Monday, April 30, 2012 12:17 PM

Subject: Re: [support] Strange characters in source of block

Thanks Earnie.My site isn't actually live yet so it's address is a numerical url. I only publicized that here once months ago. So what was this person doing trying to access random nodes I wonder?

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Anthony Stefan Maciejowski



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