Weeks before the WannaCry ransomware spread like wildfire through unpatched Windows systems, a more sophisticated, stealthier attacker used the same NSA-engineered cyberweapon to infiltrate the IT networks of companies across the world, including at least one publicly traded in the U.S., according to new research.

https://www.cyberscoop.com/super-stealthy-attackers-used-nsa-exploit-weeks-wannacry/