Avast detected this trojan in the file Sage.Mobile.Sage50Mobile.Installation.dll in folder C:\ProgramFiles(x86)\CommonFiles\SageSBD\
Pretty certain that file has been in the computer unchanged since the Sage Accounts installation. Tried online scanners and only detected by GData but also Emisoft reporting Trojan.Win32.Phorpiex!E2 and Trend Micro House Call TROJ_GEN.F47V0803. No other scanners detecting anything
None of those signs are present - your link there was where got the 4 positives out of 46 scanners. Malwarebytes Pro is running and appears happy with the file. Can you recommend someone to look at the logs?
I have contacted essexboy, who think that it is the file behaviour that avast is picking up, so a heuristic detection that could be qualified as a riskware flag. But feel free to provide the logs asked for here: http://forum.avast.com/index.php?topic=53253.0
and I am sure essexboy will look into it. I would not worry too much,