According to an article on the official Microsoft Blog, the botnet Kelihos, also known as Waledac 2.0, has been taken down on the 27th of September 2011 by Microsoft in an operation codenamed “Operation b79”. Read the full story.
After the take down of the internet connections for the US ISP McColo on November, 11th 2008, spam levels dropped worldwide between 50% and 75% according to some sources. 5 botnets Rustock, Srizbi, Pushdo/Cutwail, Ozdok/Mega-D and Gheg where directly affected because their command and control servers got disconnected from the botnet. What is the impact of … Continue reading ISP McColo down, what is the impact so far?