/usr/lib/ is in ruby-ntlm 0.6.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/net/
/usr/lib/ruby/vendor_ruby/net/ntlm/
/usr/lib/ruby/vendor_ruby/net/ntlm/blob.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/channel_binding.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/client/
/usr/lib/ruby/vendor_ruby/net/ntlm/client/session.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/client.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/encode_util.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/exceptions.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/field.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/field_set.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/int16_le.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/int32_le.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/int64_le.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/message/
/usr/lib/ruby/vendor_ruby/net/ntlm/message/type0.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/message/type1.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/message/type2.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/message/type3.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/message.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/security_buffer.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/string.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/target_info.rb
/usr/lib/ruby/vendor_ruby/net/ntlm/version.rb
/usr/lib/ruby/vendor_ruby/net/ntlm.rb
/usr/lib/ruby/vendor_ruby/rubyntlm.rb