It is funny but some are after bitcoins. More funnier is others are after cracked apps and stupidly they do not care to check the source before downloading and installing. MacRumors reported "Bitcoin-Stealing OS X Trojan Now Masquerading as 'Angry Birds' and Other Popular Mac Apps". Of course this thread is for very limited audience.
If you have some bitcoins and you stupidly downloaded cracked apps without even checking the source, check out this website and get yourself cleaned!