Study Publisher: Cisco
Study Date: January 2014
Study URL: https://www.cisco.com/web/offer/gist_ty2_asset/Cisco_2014_ASR.pdf

Study Overview:
The report does not specifically mention the source of this data other than mentioning "16 billion web requests are inspected every day through Cisco Cloud Web Security" and "28 million network connects are evaluated every day by FireAMP" Presumably this is that data analyzed by Cisco Threat Research Analysis and Communications & Security Intelligence Operations (TRAC/SIO) and summarized in these statistic entries.

Statistics From This Study:

• Collection of nearly 9 million credentials used for some brute-force attacks in 2013
• Internet brute-force login attempts increased threefold in first half of 2013