Hi Julrendo,
It was known issue and was fixed in RU6 MP2
A large number of .tmp files builds up in the XFER folder
Fix ID: 1675729
Symptom: Many files build up in the XFER folder on a Symantec Endpoint Protection client.
Solution: The Symantec Endpoint Protection client was modified to enhance extraction and clean up of XFER files.
Please check release notes.
http://www.symantec.com/business/support/index?pag...
.tmp files is detected as a risk & it's a false positive.
Upgrade from 11.0.4000 (RU4) to SEP RU7 or SEP 12.1 will fix your issue.
Check Symantec description about this virus at following link
http://www.symantec.com/security_response/writeup.jsp?docid=2007-041117-2623-99&tabid=3
I hope it will answer your question !!