Hi,
I hope you are using all three SEP features AV/AS, PTP & NTP.
You might have to submit suspicious files to the Symantec for further analysis if issue remained same.
Using Symantec Help (SymHelp) Tool, how do we Collect the Suspicious Files in SEP 12.1 and Submit the same to Symantec Security Response Team.
https://www-secure.symantec.com/connect/articles/u...
Symantec Help (SymHelp)
http://www.symantec.com/docs/TECH170752
You can scan the machine using Symantec power eraser tool also.
Use Power Eraser to detect threat and remove them
http://www.symantec.com/theme.jsp?themeid=spe-user..
Best Practices for Troubleshooting Viruses on a Network
Follow the best practices:
1) Install all the SEP features i.e. AV/AS, PTP & NTP.
1) System should be updated with Service packs and windows patches.
2) Make sure the machines are installed with the latest third party applications.
3) Disable the Autorun Feature if not using SEP 12.1.
Similar thread:https://www-secure.symantec.com/connect/forums/virus-issue-chinese-language-corrupted-files-and-folders-pen-drive