CHMOD/CHOWN are server based permissions and have no bearing to the end user if the file is served to them. What you need is to have an addon that uses FProt or ClamAV to scan attachments and imported files. I know there was Fractalizer for VB 3 and there was a VB4 variant but I think they were only for attachments. This is something that would need to be coded from scratch.
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