I am not sure if you are talking about Backdoor.Ploutus which has been added to the definitions on 09/04/13.
Every Antivirus company has its own naming conventions.
The best way to understand if Symantec Endpoint Protection is detecting this Threat or not is by submiting the files to the Symantec Security Response Team.
How to collect and submit to Symantec Security Response suspicious files found by the SymHelp utility
Secondly, check these Articles:
Naming convention for statically named virus definition update files
Virus Naming Conventions
Hope that helps!!!
Associate Security Architect
MIM | MCSA | MCTS | STS | SSE | SSE+ | ITIL v3
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What AV product detected this?
I see rapid release defs for it on 9/4/13 so I would assume yes
Please click the "Mark as solution" link at bottom left on the post that best answers your question. This will benefit admins looking for a solution to the same problem.
"Thumbs up" to the above- please submit a file to Security Response or an MD5 if you'd like to check if there is a signature to detect that.
With thanks and best regards,
Submit using the following link.
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Thanks and take care,