Whitepaper that goes over a full attack scenario by getting a foothold through Microsoft Exchange OWA Portal to discover and abuse MSSQL.
You can download it from the following link: https://packetstormsecurity.com/files/download/159335/spraying-owa.pdf
Source: https://packetstormsecurity.com/files/159335/Spraying-OWA-And-Abusing-MSSQL.html