A spate of ransomware attacks in early 2017 hit millions of computer systems worldwide, including those of National Health Service hospitals in England and radiation monitoring stations in Chernobyl. The persistent spread of simple, cheap ransomware tools puts the onus on businesses and law enforcement to reconsider their tactics for mitigating the effects of cybercrime. CSIS will host a panel discussion on ransomware proliferation and effective tactics for business-law enforcement cooperation on cybersecurity.