/usr/sbin/naxsi-ui-intercept is in nginx-naxsi-ui 1.4.6-1ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/bin/bash
cd /usr/share/nginx-naxsi/naxsi-ui/
python nx_intercept.py -c /etc/nginx/naxsi-ui.conf &
somepid=$!
echo $somepid > /run/nginx-naxsi-ui_intercept.pid
wait $somepid
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