olemus
senitundmatu viirus, mille käekirja veel ei tunta või mis kasutab ära selliseid nõrkusi, mille puhul heuristilised antiviirused ei toimi
= a virus created, not yet discovered

ülevaateid
https://www.techopedia.com/definition/29741/zero-day-malware
https://www.logixconsulting.com/2021/04/15/an-introduction-to-zero-day-computer-viruses/
https://en.wikipedia.org/wiki/Zero-day_(computing)

tõrje
https://www.isucorp.ca/blog/2021/5/21/3-ways-to-protect-your-information-from-zero-day-virus-attack
https://cybriant.com/2020/08/13/how-to-prevent-zero-day-attacks-in-5-steps/
https://media.techtarget.com/searchNetworking/downloads/Fighting_the_Battle.pdf