I am not sure if this is the right forum section to post this question, if you need to move it, I understand.

I have been getting Referred Browser Hits that are listed as
/htsrv/comment_post.php

They all say they are coming from different URL's but they do have the same IP listed.

From what I can find by searching Google, this is a way for the black hatters to get around Captcha codes. I am not sure if it is true, it's just what I could find.

I am also wondering if this is some kind of automated Spam system?

Also how much danger does it pose to my site?
When this is searched my blog brings up a Bad Request page but, I am still a bit unsure how worried I should be.

Thank you for any information you can give me.
Sheryl