Study Publisher: RSA
Study Date: September 8 2014
Study URL: https://blogs.rsa.com/hackers-guess/

Study Overview:
It is possible this data is anecdotal, but we are including it here given the specific details provided. We did contact the blog author on Twitter and requested more information on this attack but did not receive anything else to add here.

Statistics From This Study:

• An attacker compromised hundreds of accounts by trying a single popular password