Tycoon City:New York trojan

I've had this game for a while now (actually won it here) and I was going to give it a try today. I installed it using the steam client and I launched it using the steam client. Immediately my antivirus kicked in, blocked the game's exe and prompted me to do a scan. I deleted the game and tried reinstalling to see if there's any change. Once again I used the steam client and as soon as I tried to launch it I got the same exact issue. Apparently w32.trojan.sasfis.asot is attached to the tycooncity.exe that steam downloads. This is the first time I've ever experienced something like this and I'm somewhat dumbfounded. Have any of you experienced and issues like this?