On Friday, May 12th, 2017, the ransomware program WannaCry started spreading to computers all over the world at an alarming rate. A couple days later, it was basically completely contained with very little damage done. So what happened?

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Sources:

https://www.cnet.com/news/wannacry-wannacrypt-uiwix-ransomware-everything-you-need-to-know/
http://www.npr.org/sections/thetwo-way/2017/05/15/528451534/wannacry-ransomware-what-we-know-monday
https://www.cnet.com/news/ransomware-attack-cyberattack-malware/
https://www.symantec.com/connect/blogs/what-you-need-know-about-wannacry-ransomware
https://technet.microsoft.com/en-us/library/hh831795(v=ws.11).aspx
https://www.wired.com/2017/05/accidental-kill-switch-slowed-fridays-massive-ransomware-attack/
https://arstechnica.com/security/2017/05/fearing-shadow-brokers-leak-nsa-reported-critical-flaw-to-microsoft/
http://money.cnn.com/2017/05/16/technology/hospitals-vulnerable-wannacry-ransomware/
https://www.elliptic.co/wannacry/
https://www.ft.com/content/fa5ed73a-37e7-11e7-ac89-b01cc67cfeec
http://www.bbc.com/news/world-europe-39907965
https://www.theverge.com/2017/5/14/15637888/authorities-wannacry-ransomware-attack-spread-150-countries
https://www.wired.com/2017/05/wannacry-ransomware-hackers-made-real-amateur-mistakes/