/usr/share/initramfs-tools/scripts/init-premount/ is in dropbear-initramfs 2016.74-5+deb9u1.
This file is owned by root:root, with mode 0o755.
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    /usr/share/initramfs-tools/scripts/init-premount/dropbear
    
        
    
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                text/x-shellscript | root:root | 0o755 | 1.5 KB |