Depending on the malware or spyware behavior, you may experience a variety of symptoms, or no obvious symptoms at all. Some threats have ways to hide themselves in the computer, while others display messages or pictures that may indicate their presence. If you suspect a file contains malware or potentially unwanted software, you can send it to Microsoft for analysis.
You can submit samples detected by the following Microsoft Security products:
– Microsoft ForeFront Endpoint Protection 2010
– Microsoft ForeFront Client Security
– Microsoft ForeFront Server Security
– Windows Intune
– Microsoft Security Essentials
– Windows Defender
– Microsoft DaRT
If the file to be submitted is larger than 10MB or you wish to submit multiple files for analysis, it’s recommended that you compress the files into a single zip or rar archive and it must be less than 10MB in size.
Head over to Microsoft Malware Protection Centre (MMPC) to submit file sample.
For virus-related assistance at no charge, you can also contact Microsoft via the Microsoft Online Safety Portal.