How can I tell if my mbp got trojan like MacDefender?

I want to make sure that my machine is free from those malware. I followed the instruction from the apple site http://support.apple.com/kb/HT4650, seems ok, didn't find any with the common names MacDefender, MacProtector and MacSecurity but how can I be sure it didn't use another name. That malware suddenly popped up but I was able to close, quitted safari, deleted the files and emptied the trash right away. I had like 4 downloads of that macdefender package. It opened and I just didn't continue to install the application, I wonder if it didn't get through. Can somebody help me out on this? 

It would be obvious if you had it. You'd have a bright red icon in your menu bar that you couldn't get rid of, and offensive web pages would be popping up unexpectedly.

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