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2: PDM:Trojan.Win32.Generic (C:\program files (x86)\common files\steam\steamservicetmp.exe) = Malware
ONLY allow them, Still assume other files, if they crop up are malicious.
I've never had this issue with it myself, however nor do I have that file located under the steam folder (only steamservice.exe). Those ???????Tmp.exe files are most likely used when Steam updates older versions to new (keeping a backup of the old or new to swap over), it might of just thought it was odd as it didn't remove/update or something. Worth looking into.
Look up the location of the file...
Right-click the file > Properties > Digital Signatures, is it valid and signed by "Valve".
PDM:Trojan.Win32.Generic - Means it's unknown but triggered off a trojan like process, most likely trying to send data out to a server. Yes, it can be a false positive, but it's just suggesting you should check it out and ensure it's safe.
Application control and Firewall is the way to go... knowing what everything is doing and monitoring it. Virus definitions just don't cut it, can easily be bypassed. Most people are just blind to their infections.
AV TEST: http://www.av-test.org/en/antivirus/home-windows/
Sort by performance/security tabs, you will notice all application control virus scanners get top ratings. Virus definition only, such as Microsoft Security Essentials, only detects 65% of infections and therefore gets 0.5 out of 6 rating failing each year.
Anyways...
When steam updates itself, it first creates 2 temporary steam.exe files (for example), called "steamTmp.exe" and "steamNew.exe" and then tries to delete the old Steam.exe and swaps them over. This is due to Windows locking/protecting/using the file at the time. If that tmp.exe file is still there, either the update failed or it's just left over backup file. Either way something might of went wrong, the file signature might be corrupted and Kaspersky has most likely just picked up on that.
Trojans can also fake the real steam files, using the same naming. "SteamWebHelper.exe" being the most commonly used, located somewhere else other than the steam/bin folder is most likely a Stimilik trojan.
It however appears for you to be due to copying of files when updating Steam Client.
Either the file signature isn't valid/corrupted or the file transfer is getting stuck/blocked perhaps by Windows or something? A temporary file is left over, then Kapersky active scanner detects that as a possible threat because the security level of it would be at 0 - Unknown, plus have code in it which can access the net, etc.
What Operating System are you using?
Do you have full admin rights/access?
Firstly, as it's only recenty turned up and it's been the weekend, they might only just be aware of it.
Secondly, it happens from time to time. It's only a section of code somewhere that resembles a piece of code in known malware (a bit like the word "smiles" contains the word "mile"). They will undoubtedy update it in the next few days.