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New DeepScreen technology allows avast! to make more intelligent decisions about new/unknown files. DeepScreen is a successor of AutoSandbox, now upgraded with some additional new technologies such as dynamic binary translation and dyna-gen announced earlier.
http://forum.avast.com/index.php?topic=132502.0
Its in v9 beta: http://forum.avast.com/index.php?topic=134419.0