[Plugin: Better WP Security] Constant Log In Attempts

I constantly get log in attempts that don’t look human, is this some sort of bot attacking me? Log looks like this…

2012-09-21 08:31:14
2012-09-21 08:31:14 username
2012-09-21 08:43:02
2012-09-21 08:43:02 username
2012-09-21 08:54:26
2012-09-21 08:54:26 username
2012-09-21 08:18:49
2012-09-21 08:18:49 username

http://ww.wp.xz.cn/extend/plugins/better-wp-security/