Malware creators have spent a lot of energy over the years obfuscating the malicious files they drop on infected systems to stay one step ahead of detection mechanisms. This year they’re taking their efforts to a new level by dispensing with dropped files altogether.
Article Link: http://www.darkreading.com/vulnerabilities---threats/fileless-malware-takes-2016-by-storm/d/d-id/1327796?_mc=RSS_DR_EDT