/usr/lib/x86_64-linux-gnu/libisc.so is in libbind-dev 1:9.10.3.dfsg.P4-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libisc.so.160.0.0
/usr/lib/x86_64-linux-gnu/libisc.so.160.0.0