A new variant of the Sundown exploit kit leverages on steganography to hide exploit code in harmless-looking image files. Steganography was recently observed in the malvertising campaigns conducted by the AdGholas and GooNky groups. The most affected countries were Japan, Canada, France and the US. The updated version of Sundown has been used in several malvertisingcampaignstargetingusers in Japan,Canada,France andthe US.”]
Source: http://securityaffairs.co/wordpress/54886/cyber-crime/sundown-exploit-kit-2.html