Old malware rarely dies:  it just lies dormant for a while.  This was one of the key findings of the Check Point Research Team’s latest Global Threat Impact Index, which saw a surge in the usage of Exploit Kits during March, following a steady decline in usage since a high point in May 2016.

http://blog.checkpoint.com/2017/04/13/marchs-wanted-malware-list-exploit-kits-rise-popularity/