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I have an IIS hosted website that is getting lots of suspicious data coming in from the contact form. What I mean by suspicious is that there are people whose names and address and phone numbers are all valid, but when my company contacts them they have never heard of us. We attempted to use a CAPTCHA to help prevent this, but it merely slowed it down. We would filter out the IP addresses, but it is never using the same IP twice and it is not using it in ANY pattern we can recognize. I am at a loss here as to what to do to keep them from giving us bad data. The problem, also, is that I am not entirely sure it is a Bot since they are coming in at a pace that COULD be a few people doing one right after the other, though this seems unlikely since they come in ALL the time. Does anyone have any suggestions on, if it IS a bot, keeping it form submitting the form or identifying it after the form has been submitted? Also, is there any way to tell for sure that it IS a bot?

Sam
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Why do people have to enter data? Is it to download something? People will always enter any false data if it's to get at something they feel doesn't need their personal info. 'Any info' is not the same as 'accurate info'.

Your problem is not bots, but perhaps imposing your want for unwanted info.

Also, depending on the captcha, some are easier to bypass than others, but why would people want to bypass it if they gain nothing (such as a link on your site) in return?

user3791372
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  • I did not want to go into specifics, but the data is needed to perform a service for them. And we are used to inaccurate info coming in. But this goes beyond inaccurate info. We get ACCURATE names, addresses, phone numbers and emails for a person, then we call them and they have never heard of us. We also experience a high jump in traffic to these pages which matches the jump in suspicious data. – Sam Sep 04 '14 at 15:09
  • Also, All of the bad data that comes through has a sequential ip address numbering. And I mean perfectly sequential. it goes from multiple 73.s to 74.s to 75.s etc. – Sam Sep 04 '14 at 16:23