|23 Mar 2010||#1|
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Botnet pierces Microsoft Live through audio captchas.
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. The attack allows the zombie machines to send email through accounts with a Live.com address, which are whitelisted by many spam filters. The technique offers spammers an alternative to sending spam through open mail relays, which are often blacklisted.
Botnet pierces Microsoft Live through audio captchas ? The Register
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