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by throwaway_391 2509 days ago
zero-day malware probably makes malware writing sound difficult. Bypassing fingerprint-based scanners is reasonably easy with the use of 'packers' (which can be bought from hacker markets for pretty cheap, or built pretty easily). Bypassing heuristic based scanners is a little more research-intensive[1], but some 'packers' do this too.

https://wikileaks.org/ciav7p1/cms/files/BypassAVDynamics.pdf