registering of "spam" users with strange names ...

Since a few days always new users with strange names and descriptions are registered. I don't know if these are bots or something else. The ReCaptcha at the registration is enabled and works so far I think.

Here is a snapshot from the user-database, maybe someone can see something I didn't recognized.

Does anyone have an idea what this could be or is this problem with bot-registration already known?

Is there an alternative captcha system I can use with Dolphin?

When deleted, they appear after a while (hour / days) again:

A list of names:

• aathrriisaath
• qquechhetooor
• ttryccerraacch
• llddelddussk
• aathhghhaeem
• ciilyeehaatt
• moouupphold
• aaswwoordan
• ageougghech
• ttiuskktuur
• eestrrayyraan
• tthrressriis
• sccheddynaatth
• ccaddarllyeee
• uuntroothuunt
• ssikkalleem
• ttraffatthh
• lleddynaalee
• leeechtaiii
• rrhhayrrrlyye
• ceeighhtddel
• lloeeppttonn
• kkeuunrrrakk
• lliatthbbann
• llyellmyeer
• sslirrrannn
• rrisardenthh

Has anyone an idea?

thanks for your help

jo

ReCaptcha is already the toughest of all the captchas and is most likely working as intended.  The problem is spammers outsource people in third-world countries to intercept and enter captcha info while their spam bots are signing up and creating the accounts.  I don't know there's much that can be done about it yet; even blocking the IP addresses won't help as generally they rotate through proxies.

READ MY POSTS HERE >>> http://www.boonex.com/forums/topic/Now-with-7-1-1-timeline-got-another-bug-spam-.htm

Some of the most effective ways to prevent spammers are talked about :)

Actually, ReCaptcha is broken and has been broken for some time; this may not be well known but do some searches and you will see.  In order for any type of Captcha to be effective, it must be impossible, and I mean impossible, for a human to read and thus makes it impossible for anyone to register.  I am seeing spam registrations similar to what you have and from the data entered, it is clearly a bot doing the registrations.  On my site they are targeting the description box for profiles.

The solution; or at least for me; will be to remove ReCaptcha and put in more effective turing tests that a person can read but makes it much harder for a bot to get pass.

You need a human question field.

For those interested i have a anti spam product in the market http://www.boonex.com/m/dolphin-anti-spam that catches most spammers without the need of captcha or human questions.