Hello,
You could try running the SERT Utility, if you have access to Fileconnect, the SERT (Symantec Endpoint Recovery Tool) is useful in situations where computers are too heavily infected for the Symantec Endpoint Protection client installed upon them to clean effectively. The Consumer version of this tool is the Norton Bootable Recovery Tool. The tool is free, so there is no need for a Fileconnect account to download the software.
You could also try working on the steps provided below on collecting the suspicious files and submitting the same to the Symantec Security Response Team.
Using Symantec Support Tool, how do we Collect the Suspicious Files and Submit the same to Symantec Security Response Team.
Here is a good public blog post from Symantec Security Response about why ransomware has become so prevalent recently:
https://www-secure.symantec.com/connect/blogs/ransomware-crimeware-kits
Also see: Ransomware and Silence Locker Control Panel
https://www-secure.symantec.com/connect/blogs/ransomware-and-silence-locker-control-panel
and: https://www-secure.symantec.com/connect/node/1618951
and https://www-secure.symantec.com/connect/blogs/ransomware-and-silence-locker-control-panel
I would also recommend you to make sure you create a case with Symantec Technical Support.
You could either Create a Case OR contact Symantec Technical Support.
How to create a new case in MySupport
http://www.symantec.com/docs/TECH58873
How to update a support case and upload diagnostic files with MySupport
http://www.symantec.com/docs/TECH71023
OR
Regional Support Telephone Numbers:
United States: 800-342-0652 (407-357-7600 from outside the United States)
Australia: 1300 365510 (+61 2 8220 7111 from outside Australia)
United Kingdom: +44 (0) 870 606 6000
Additional contact numbers: http://www.symantec.com/business/support/contact_techsupp_static.jsp
Hope that helps!!