McAfee Malware Support Operations have released the following guide to help combat Cryptolocker and Cryptolocker via SNS last week.
We deployed these Access Protection Rules last week.
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and yes, those were the Settings we have in use but as mentioned we did Encounter an infection without having an executable on the harddisk (that is the scary part). Nevertheless the malwarefamiliy in our cases is part of the TeslaCrypt Family: