Various techniques are being tried to filter-out the malicious registrations since the old "Where is the Granvia manufactured?" test question is ineffective. The ReCaptcha test of recognising a jumble of letters has been tried and even that is ineffective. A different approach is being tried today to try to find out if the attack is coming from real humans or machines.
I have same problem on my forum club4x4.ro (is a biggest 4x4 forum from Romania).
I think spammers use some new script and penetrate our protection. For now, i don't have a solution. I just watch new members and i delete spammers. Is verry easy to detect wich is spammer.
My forum platform is Vbulletin with pay licence and is the best forum platform but spammers is more stronger.
I re-enabled the new-member registration process a few days ago - there has been no sign of any further spurious registrations. There is now a new test question which must be answered before the system allows registration to proceed: "How many doors does a standard 1995 Granvia have?" The eagle-eyed will have spotted that the description of the Granvia at the top of the header page has been slightly altered.
On the assumption that sooner-or-later the bot-nets will come-up with the correct answer to the test question, does anyone have a simple question which anyone with an interest in the Granvia could be expected to answer without too much difficulty? (The answer can't be Yes/No or have a limited number of answers, for example "Is the Granvia Left- or Right-hand Drive? - too easy to guess for the bot-nets).
Can I suggest that the question whatever it is, is displayed as a picture eg jpeg so that the bot-nets are unable to understand it?
I realize that the ReCaptcha test isn't effective, but that comprises random letters/digits which can be recognized and replicated, and do not require an intelligent response.
That, together with requiring registrants to give their email addresses for activation, should defeat most attacks.
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