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Re:OS X sudoers exploit found in the wild by JonnieCache on Friday August 07, 2015 @12:13PM (#10023279)
TCPBlock is a free version of little snitch. It's apparently abandoned, but it doesn't need any more features.

http://www.macupdate.com/app/mac/35914/tcpblock

You can set it up to disallow all network traffic until you whitelist the binary. Not sure if it's actually hashing them or just checking the path though.

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