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Cryptowall infection!

Last Modified: 2015-09-25
We recently had a server on the network become infected with the Cryptowall virus.  Luckily we have a pretty solid backup plan in place and were able to painlessly restore the server to a previous state without any issues.  But how can we identify where the virus came from in the first place?  We use a Sonic Wall firewall with the security suite that includes intrusion prevention, gateway anti virus, and anti spam.  On top of that, all client workstations have AVG installed.  I guess its still possible that an infected email got past the firewall but if it did then how do I go about finding that email?
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