To begin with, I run Windows 7 Professional. I keep it patched up to date. I also run ESET NOD32 v4, and Windows Defender is on by default. Malwarebytes AntiMalware is run once a week on-demand.
Today I launched Steam, connected, and found there was a patch. I downloaded the patch and let it install. After it installed, I reconnected to steam, and suddenly Windows Defender popped up.
The popup balloon didn't say that it had found a virus, or malware. It said it flagged SteamServiceTmp.exe, and that it wanted to submit the file to Microsoft. I don't know if this means there was a virus in the file or some other malware. I think that's unlikely, considering it came directly from Valve (That's the file that launches to patch the Steam Service), but I'm not sure what that means. I can't find any record of the file being detected in the Windows Defender History, at all. Does this mean I have a virus? What is this all about?
All I can find is this information from the Event Viewer:
Fault bucket 864089046, type 5
Event Name: AVSubmit
Response: Not available
Cab Id: 0
P1: Windows Defender
These files may be available here:
Rechecking for solution: 0
Report Id: 78cda38e-e5ff-11de-862f-001fbc01945b
Report Status: 0
EDIT: Upon review, here's the contents of the Report.wer file generated
Sig.Name=Problem Signature 01
Sig.Name=Problem Signature 02
Sig.Name=Problem Signature 03
Sig.Name=Problem Signature 04
Sig.Name=Problem Signature 05
AppName=Windows Defender User Interface
AppPath=C:\Program Files\Windows Defender\MSASCui.exe
I uploaded the file to Virustotal, but the report has since expired. It came back with 1/41 as the result, with Panda finding the only positive (W32/Xor-encoded.A), and everything else being negative.