If it was a keylogger then all your accounts would be hacked so i don't think you have a keylogger you must have been hacked by the 'friend' who knows your info or could work it out or maybe your siblings another could be you have used the same info on an ot or open tibia forum
edit: another reason why you don't have a keylogger is because MBAM and Avast are 2 of the best you can get (even the free versions!) and if they haven't detected it then it probably isn't there
