/usr/bin/makecert is in mono-devel 3.2.8+dfsg-4ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
umask 077
exec /usr/bin/mono $MONO_OPTIONS /usr/lib/mono/4.5/makecert.exe "$@"
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