/usr/share/Crack/scripts/binstamp is in crack-common 5.0a-9.3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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###
# 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.
###
SYSTEM=`uname -s`
RELEASE=`uname -r`
ARCH=`uname -p || arch || uname -m`
# For Debian we do *not* want architectures, this is handled
# by the different packages
if [ -f /etc/debian_version ] ; then
	echo "debian"
	exit 0
fi
case $ARCH in
    i486)        ARCH=i386 ;;
    x86)         ARCH=i386 ;;
    i86pc)       ARCH=i386 ;;
    sun3?*)      ARCH=sun3 ;;
    sun4?*)      ARCH=sun4 ;;
esac
if [ "$STRICT_OSREV" = "" ]
then
    RELEASE=`echo $RELEASE | awk -F. '{print $1}'`
fi
if [ "$SYSTEM" = "" ]
then
    if [ -d /mach ]
    then
	SYSTEM=mach
    fi
elif [ "$SYSTEM" = "AIX" ] # so much for standards
then
    ARCH=`uname -v`
fi
if [ "$RELEASE" = "" ]
then
    RELEASE=norel
fi
if [ "$ARCH" = "" ]
then
    ARCH=noarch
fi
echo "$SYSTEM-$RELEASE-$ARCH" |
    tr '[A-Z]' '[a-z]' |
    tr -cs '\010\055\137[0-9][A-Z][a-z]' '_'
# 'tr' is a f*cking pain - hacked about by too many morons
exit 0
 |