Statistical Submission Question

NIS 2012 v 19.8.0.14

Vista Home Premium 32 bit

Vista SP 2

IE 8 browser

 

First let me say I  know that a statistical submission means that something has just sparked curiosity and does not mean it's an infection.

That said I have seen two statistical submissions over the last few days that have me curious

 

Both are located in Windows/System32/

 

mshtml.dll

 

IEFRAME.DLL

 

I have scanned the file with NIS and they are clean.

Neither of them SHOW A SIGNATURE from Microsoft

 

when I go to Windows/System32 and look at the files they both show as:

Modified 8/25/12

 created on 9/21/12 at 3:42pm

\Accessed  on 9/21/12 at 3:42pm

 

I did search for Microsoft updates around that time, I downloaded the updates, BUT DID NOT INSTALL UNTIL LATER, like 4 hours later

 

mshtml.dll is 5.73 MB

IEFRAME.DLL is 10.5 MB

 

Since these are not signed, I'm wondering if they are legit?

Also since they show created and accessed hours before I installed, I'm also concerned about that

 

Any help is appreciated.

 

Thanks