CAPTCHA smuggling: hijacking web browsing sessions to create CAPTCHA farms
Proceedings of the 2010 ACM Symposium on Applied Computing
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Cyber criminals have finally merged the idea of crowdsourcing and Captcha solving. Troj/CAPTCHA-A is a trojan horse posing as an adult game, in which a stripper called Melissa sheds clothing every time the user solves a Captcha puzzle. A Captcha is a test designed to distinguish humans from computers, and the most common example is the transcription of distorted text into a web form as part of the process of setting up email accounts or posting to blogs. The trojan creates another instance of Internet Explorer and submits the user's Captcha solution to a server, says an analysis from anti-virus firm Sophos.