Usually if you create malicous programs(virus,spyware...), the antivirus will detect easily. It will scan the source code. if it finds the malicious source codes, then it will alert as "virus". To know more details about antiviru program read this article:
How does Anti Virus detects viruses
I hope you know about the antivirus functions completely. In that article, i have mentioned "Crypter"
How to make Virus/spyware Undetectable by all antivirus?
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