What is "alureon"

Alureon (also known as TDSS or TDL-4) is a trojan and bootkit created to steal data by intercepting a system's network traffic and searching for: banking usernames and passwords, credit card data, PayPal information, social security numbers, and other sensitive user data. Following a series of customer complaints, Microsoft determined that Alureon caused a wave of BSoDs on some 32-bit Microsoft Windows systems. The update, MS10-015, triggered these crashes by breaking assumptions made by the malware author(s).

According to the research conducted by Microsoft, Alureon was the second most active botnet in the second quarter of 2010.