/usr/lib/ruby/ is in ruby-virtus 1.0.5-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/virtus/
/usr/lib/ruby/vendor_ruby/virtus.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/
/usr/lib/ruby/vendor_ruby/virtus/attribute.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/accessor.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/boolean.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/builder.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/coercer.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/coercible.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/collection.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/default_value/
/usr/lib/ruby/vendor_ruby/virtus/attribute/default_value.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/default_value/from_callable.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/default_value/from_clonable.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/default_value/from_symbol.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/embedded_value.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/hash.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/lazy_default.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/nullify_blank.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute/strict.rb
/usr/lib/ruby/vendor_ruby/virtus/attribute_set.rb
/usr/lib/ruby/vendor_ruby/virtus/builder/
/usr/lib/ruby/vendor_ruby/virtus/builder.rb
/usr/lib/ruby/vendor_ruby/virtus/builder/hook_context.rb
/usr/lib/ruby/vendor_ruby/virtus/class_inclusions.rb
/usr/lib/ruby/vendor_ruby/virtus/class_methods.rb
/usr/lib/ruby/vendor_ruby/virtus/coercer.rb
/usr/lib/ruby/vendor_ruby/virtus/configuration.rb
/usr/lib/ruby/vendor_ruby/virtus/const_missing_extensions.rb
/usr/lib/ruby/vendor_ruby/virtus/extensions.rb
/usr/lib/ruby/vendor_ruby/virtus/instance_methods.rb
/usr/lib/ruby/vendor_ruby/virtus/model.rb
/usr/lib/ruby/vendor_ruby/virtus/module_extensions.rb
/usr/lib/ruby/vendor_ruby/virtus/support/
/usr/lib/ruby/vendor_ruby/virtus/support/equalizer.rb
/usr/lib/ruby/vendor_ruby/virtus/support/options.rb
/usr/lib/ruby/vendor_ruby/virtus/support/type_lookup.rb
/usr/lib/ruby/vendor_ruby/virtus/value_object.rb
/usr/lib/ruby/vendor_ruby/virtus/version.rb