from the doc: 'brute force the Yahoo account.Actually it read the password from the password file and chek if this is correct or not,so bigger the password file bigger the chance to success. anyway it is very fast,it can chek more than 30 words per minute,It is easy to crack the yahoo passes,It using some advance technology for cracking the yahoo passes.. Enjoy...'
Win32/Spyboter.NAA trojan [Eset]Yahoo password Cracker
yahoopasscrack.exe