The recent ransomware attack named "WannaCry" that spread globally and has affected over thousands of devices including the ATMs in India has forced them to shut down ATMs to stop the further spread of this ransomware. This is the highest affected ransomware till now and was made possible due to a flaw in older versions of Windows OS that was got leaked from the CIA. Speculations include the hackers must have used a software called "Eternal blue hacking weapon created by the NSA to find that vulnerability.It uses the vulnerability in operating systems to gain access to the OS. The well-known Whistleblower Edward- Snowden says "CIA's to blame", he also states, " They knew about this flaw in U.S. software, U.S. infrastructure, hospitals around the world, these auto plants and so on and so forth, but they did not report it to Microsoft until after the NSA learned that that flaw had been stolen by some outside group"
Source - http://www.washingtontimes.com/news/2017/may/16/edward-snowden-blames-nsa-enabling-unprecedented-w/
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