/usr/lib/ is in erlang-webtool 1:17.3-dfsg-4+deb8u2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/erlang/
/usr/lib/erlang/lib/
/usr/lib/erlang/lib/webtool-0.8.10/
/usr/lib/erlang/lib/webtool-0.8.10/priv/
/usr/lib/erlang/lib/webtool-0.8.10/priv/root/
/usr/lib/erlang/lib/webtool-0.8.10/priv/root/doc/
/usr/lib/erlang/lib/webtool-0.8.10/priv/root/doc/tool_management.html
/usr/lib/erlang/lib/webtool-0.8.10/priv/root/doc/start_info.html
/usr/lib/erlang/lib/webtool-0.8.10/priv/root/doc/index.html
/usr/lib/erlang/lib/webtool-0.8.10/priv/root/conf/
/usr/lib/erlang/lib/webtool-0.8.10/priv/root/conf/mime.types
/usr/lib/erlang/lib/webtool-0.8.10/priv/bin/
/usr/lib/erlang/lib/webtool-0.8.10/priv/bin/start_webtool
/usr/lib/erlang/lib/webtool-0.8.10/ebin/
/usr/lib/erlang/lib/webtool-0.8.10/ebin/webtool_sup.beam
/usr/lib/erlang/lib/webtool-0.8.10/ebin/webtool.beam
/usr/lib/erlang/lib/webtool-0.8.10/ebin/webtool.appup
/usr/lib/erlang/lib/webtool-0.8.10/ebin/webtool.app