Botnet Pierces Microsoft Captchas

23 March 2010

"The prolific Pushdo spam botnet has found a new way to penetrate Microsoft's Live.com by exploiting weaknesses in the audio captchas designed to prevent automated scripts from accessing the popular email service...

...A new version of the bot causes infected PCs to pull down Live.com audio captchas and return the correct response within 10 seconds, according to a researcher at anti-virus firm Webroot...."