VERY IMPORTANT

Sundown is something of an outlier from typical exploit kits. It tends to reuse old exploits and doesn’t make an effort to disguise their activity. The URLs for Sundown requests for Flash files end in .swf, while Silverlight requests end in .xap. These are the normal extensions for these file types. Typically, other exploit kits make an effort to hide their exploits. In addition, Sundown doesn’t have the anti-crawling feature used by other exploit kits.