The most sophisticated program ever written

Recently I've found a description of the Stuxnet worm, which exploited the vulnerability of Windows to quietly copy itself from the flash drive so that no antivirus program suspected anything, then, using stolen certificates from Realtek and JMicron, copied itself to other flash drives using a false driver, spread itself all over local network, then looked for Siemens software to control industrial centrifuges, copied itself to the controller and unnoticed for experts set the wrong rotational speed of the centrifuges, which led to their spoilage when they enriched uranium.

Instructive story.

https://www.quora.com/What-is-the-most-sophisticated-piece-of-software-code-ever-written

https://www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/w32_stuxnet_dossier.pdf

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