Wordpress password hash for older versions using md5 hashing algorythm with basic md5 encryption. Takes no time to reverse with brute force (for example Rainbow-table). That is why Wordpress changed it to md5 crypt hashing from version 3.x. You can change in Wordpress mysql database ยป table *users. Asterix stands for db prefix. Easiest way to reset password or change password

Wordpress v2 password hash