What you're looking for is other services that do this? I think many of the AV companies do this, although I have never used that service. There are many places you can go online to get information on specific malware files that might be disguised as a legit program. If you do a Google search on the suspect filename, you can find information on the profile. The disguised programs are almost never the exact size as the legit file and often reside in a different directory.
Another giveaway is associated files. If it isn't masquerading as a Windows file, you can look at what program the legit file would be associated with and see if you even have that program installed. Also, malware often has several component files that aren't...