The WannaCry ransomware attack was a worldwide cyberattack in May 2017 by the WannaCry ransomware cryptoworm, which targeted computers running the Microsoft Windows operating system by encrypting data and demanding ransom payments in the Bitcoin cryptocurrency.[5] It propagated through EternalBlue, an exploit developed by the United States National Security Agency (NSA) for Windows systems. EternalBlue was stolen and leaked by a group called The Shadow Brokers a month prior to the attack. While Microsoft had released patches previously to close the exploit, much of WannaCry's spread was from organizations that had not applied these, or were using older Windows systems that were past their end-of-life. These patches were imperative to organizations' cyber security but many were not implemented due to ignorance of their importance. Some have claimed a need for 24/7 operation, aversion to risking having formerly working applications breaking because of patch changes, lack of personnel or time to install them, or other reasons.

Quick facts: Date, Duration, Location, Also known as, Type...
WannaCry ransomware attack
Screenshot of the ransom note left on an infected system
Date12 May 2017 – 15 May 2017
(initial outbreak)[1]
Duration4 days
LocationWorldwide
Also known asTransformations:
Wanna → Wana
Cryptor → Crypt0r
Cryptor → Decryptor
Cryptor → Crypt → Cry
Addition of "2.0"
Short names:
Wanna → WN → W
Cry → CRY
TypeCyberattack
ThemeRansomware encrypting files with $300–600 USD demand (via bitcoin)
CauseWannaCry worm
Outcome300,000+ computers infected[2][3][4]
ArrestsNone
SuspectsLazarus Group
AccusedTwo North Koreans indicted
ConvictionsNone
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Quick facts: Subtype, Point of origin, Author(s), Operatin...
WannaCry
SubtypeRansomware
Point of originPyongyang, North Korea
Author(s)Lazarus Group (not confirmed)
Operating system(s) affectedMicrosoft Windows
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The attack began at 07:44 UTC on 12 May 2017 and was halted a few hours later at 15:03 UTC by the registration of a kill switch discovered by Marcus Hutchins. The kill switch prevented already infected computers from being encrypted or further spreading WannaCry.[6] The attack was estimated to have affected more than 300,000 computers[7] across 150 countries,[7] with total damages ranging from hundreds of millions to billions of dollars. Security experts believed from preliminary evaluation of the worm that the attack originated from North Korea or agencies working for the country.

In December 2017, the United States and United Kingdom formally asserted that North Korea was behind the attack.[8]

A new variant of WannaCry forced Taiwan Semiconductor Manufacturing Company (TSMC) to temporarily shut down several of its chip-fabrication factories in August 2018. The virus spread onto 10,000 machines in TSMC's most advanced facilities.[9]

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