/usr/lib/ is in libb-hooks-op-check-entersubforcv-perl 0.09-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.22/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/B/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/B/Hooks/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/B/Hooks/OP/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/B/Hooks/OP/Check/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/B/Hooks/OP/Check/EntersubForCV/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/B/Hooks/OP/Check/EntersubForCV/EntersubForCV.so
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/Hooks/
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/Hooks/OP/
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/Hooks/OP/Check/
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/Hooks/OP/Check/EntersubForCV.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/Hooks/OP/Check/EntersubForCV/
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/Hooks/OP/Check/EntersubForCV/Install/
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/Hooks/OP/Check/EntersubForCV/Install/Files.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/B/Hooks/OP/Check/EntersubForCV/Install/hook_op_check_entersubforcv.h