/usr/bin/dbsessmgr4 is in mono-xsp4 3.8-2.1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#!/bin/sh exec /usr/bin/mono $MONO_OPTIONS "/usr/lib/xsp/4.0/dbsessmgr4.exe" "$@"