Spam bot (I think) from multiple IP addresses

[nadreg]

Hi all,

Starting from about 1 week ago, I started getting a lot of traffic from "direct users" hitting my forum. I looked deeper into this, and noticed the following behaviour:

1. The traffic is going almost completely to the register.php page
2. I am not seeing a lot of "fake" registrations on my site, and by fake I mean the man/male standard crap that these things register with.
3. As for the IPs that this traffic is coming from, it's from primarily these countries: Thailand, Turkey, Brazil, South Korea. Traffic from these destinations is very rare on my site, which is primarily about India.

Has anyone seen an attack like this before? The traffic from multiple locations is what baffles me. Is this a sophisticated attack, or is IP spoofing that easy to do these days?

I'm thinking of installing the Is Bot hack to prevent further registrations, by the way. I read some good reviews on it.

Any help is sincerely appreciated.