I never got where the misconception of “*nix doesn’t have malware” came from. Maybe from the 2k era where “malware” was anything that was slowing down your PC (I also don’t get why a malware would slow down your PC, unless it’s a ransomware)?
I remember the c99.php shell from way back which is an amazing example of cross-platform (PHP can run anywhere) “virus” and it was considered a golden standard (2010 era?)