This file is indexed.

/usr/share/Crack/scripts/mkcracker is in crack-common 5.0a-11.

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 -x
###
# This program was written by and is copyright Alec Muffett 1991,
# 1992, 1993, 1994, 1995, and 1996, and is provided as part of the
# Crack v5.0 Password Cracking package.
#
# The copyright holder disclaims all responsibility or liability with
# respect to its usage or its effect upon hardware or computer
# systems, and maintains copyright as set out in the "LICENCE"
# document which accompanies distributions of Crack v5.0 and upwards.
###

# Eulogy for Paul Revere, upon visiting his grave in Boston:
# "Of course, you realise, this is all your fault..."

prefix=$1

shift

if [ -d ../libdes ] # libdes from eay
then

    ( cd ../libdes ; make ) || exit 1
    exec make "$@" $prefix/libdes-cracker

elif [ -d ../ufc-crypt ] # UFC from comp.sources.misc
then

    ( cd ../ufc-crypt ; make ) || exit 1
    exec make "$@" $prefix/ufc-cracker

elif [ -d ../crypt ] # GNU UFC in disguise
then

    ( cd ../crypt ; make ) || exit 1
    exec make "$@" $prefix/gnu-cracker

else

    exec make "$@" $prefix/stdlib-cracker

fi

echo "WTF!?!"

exit 1