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Windows Defender Anti-virus Bypassed Using Direct Syscalls & XOR Encryption
(cybersecuritynews.com)
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this post was submitted on 12 Apr 2025
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That's how it was done in the old days to save a few cycles in Z80 assembly. XOR A instead of LD A, 0.
I use that daily in my accelerator work.
Once you learn the trick, you just use it naturally.