Spear phishing - CEO fraud

http://www.securityweek.com/austrian-firm-fires-ceo-after-56-million-cyber-scam

http://www.theregister.co.uk/2016/04/07/ceo_email_fraud_cost_2_3bn/

http://krebsonsecurity.com/2015/08/fbi-1-2b-lost-to-business-email-scams/

Belgian Crelan Bank loses 75.8-million dollars in CEO fraud

http://catless.ncl.ac.uk/Risks/29.23.html#subj3

http://www.ehackingnews.com/2016/01/cyber-insurer-sued-after-company-loses.html

The 'bogus boss' email scam costing firms millions

http://www.bbc.com/news/business-35250678