Apple's XProtect system (aka File Quarantine) in OS X is a rudimentary anti-malware scanner that will perform a quick check on downloaded files to make sure they do not contain known malware, and will block any versions of Web plug-ins like Java and Flash that have known vulnerabilities.
XProtect runs in the background with no interaction with the user, which is convenient, but it does mean that when it gets updated, users may find themselves unexpectedly unable to access some Web content. Even though quickly updating plug-ins should get you around this inconvenience, it may be useful to know if the block happened because of XProtect or for some other reason that may need to be investigated.
With a small custom script, you can cause the system to notify you when its XProtect definitions are updated.
(Credit: Screenshot by Topher Kessler/CNET)
Unfortunately, Apple does not provide notifications when XProtect is updated; however, you can implement a routine of your own that will check for and notify you of any updates.
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by Topher Kessler via CNET How To
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