Why does update-notifier contains system-crash-notification?

I just had "System Program Problem Detected" window appearing several times before user session even started (I have KDM with autologin to locked session).
I traced it with xprop to being /usr/lib/update-notifier/system-crash-notification which is binary (while I expected it to be some script) and belongs to update-notifier package (while I expected it to be somewhere from apport*).

$ dpkg -s update-notifier | grep Version
Version: 0.147
$ dpkg -L update-notifier | grep system-crash
/usr/lib/update-notifier/system-crash-notification
$ grep RELEASE /etc/lsb-release
DISTRIB_RELEASE=13.10