I haven't downloaded anything than just this particular otc dll, and after a day my prime account was stolen.

It's a SteamStealer which steals your prime accounts

This thing has a SteamStealer in it!!! I launched it because i was stupid and didn't read the whole thread carefully, now my prime account is gone, it infects your INetCache from your browser folders and steals your prime accounts. The reason why i said prime acocunts is because i have 10+ steam...