I wouldn't call a RAM scraper an exploit. ASLR isn't an effective protection against a program that reads from memory. Driver signing in newer versions of Windows is a more appropriate protection but will still fall short of stopping a motivated attacker.
Newer versions of Windows make this exploit far more difficult [2].
[1] http://www.dailytech.com/Appalling+Negligence+DecadeOld+Wind...
[2] http://en.wikipedia.org/wiki/Address_space_layout_randomizat...