/usr/lib/x86_64-linux-gnu/libasan.so.1 is in libasan1 4.9.3-13ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libasan.so.1.0.0
/usr/lib/x86_64-linux-gnu/libasan.so.1.0.0