Hello,
I would request you to make sure you to follow the Plan of Action:
STEP 1 - CHECK FOR KNOWN OS VULNERABILITIES AND DOWNLOAD PATCHES TO PROTECT THEM:
Begin by checking your network for known, patchable OS vulnerabilities that may be exploited to spread virus infections. The Microsoft Baseline Security Analyzer is a free tool from Microsoft that you can use to analyze your vulnerability to known security exploits in the Microsoft Windows operating environments. This tool centrally scans Windows-based computers for common security mis-configurations and generates individual security reports for each computer that it scans. MBSA will scan for common security mis-configurations in the following products: Windows 2000, Windows XP, Windows Vista Windows Server 2003, Windows Server 2008, Internet Information Server (IIS) 5.0, and 6.0, SQL Server 7.0 and 2000, Internet Explorer (IE) 5.01 and later, and Office 2000, 2002 and 2003. MBSA also scans for missing security updates, update rollups and service packs published to Microsoft Update.
You can download the MBSA free from Microsoft at the following link:
http://technet.microsoft.com/en-us/security/cc184924.aspx
Install ALL Latest Microsoft Secuirty Patches / Sevice Packs on ALL machines
STEP 2 - SUBMIT SUSPICIOUS FILES FOR ANALYSIS TO SYMANTEC SECURITY RESPONSE:
Provided in the Article below:
Using Symantec Support Tool, how do we Collect the Suspicious Files and Submit the same to Symantec Security Response Team.
STEP 3 - Disable Auto play with GPO
http://support.microsoft.com/kb/953252
STEP 4 - Disable Scheduled Tasks with GPO
http://support.microsoft.com/kb/310208
STEP 5 - Enable Security Auditing with GPO
http://support.microsoft.com/kb/300549
STEP 6 - Scan ALL the machines...
Please Check the write-ups for these Threats -
W32.Imaut - http://www.symantec.com/security_response/writeup.jsp?docid=2006-091915-1213-99
W32.Imaut.AA - http://www.symantec.com/security_response/writeup.jsp?docid=2007-060717-3202-99
Suspicious.Emit - http://www.symantec.com/security_response/writeup.jsp?docid=2010-042920-5108-99
Trojan.Gen - http://www.symantec.com/security_response/writeup.jsp?docid=2010-022501-5526-99
Trojan Horse - http://www.symantec.com/security_response/writeup.jsp?docid=2004-021914-2822-99
StealthMBR.a - http://www.symantec.com/security_response/writeup.jsp?docid=2008-010718-3448-99
Bloodhound.Olexe - http://www.symantec.com/security_response/writeup.jsp?docid=2012-050814-3052-99
Trojan.ADH.2 - http://www.symantec.com/security_response/writeup.jsp?docid=2011-030906-0727-99
Hope that helps!!