Seattle hacker attack security company Icebrg.io said it's raised $2.5 million in seed financing. Icebrg.io said the funds came from Madrona Venture Group, with participation from Formation 8 and other individual and institutional investors. "Attackers are making a lot of money breaking into corporate networks stealing proprietary information and other valuable assets," said CEO and co-founder William Peteroy, in a statement. Peteroy co-founded Icebrg.io with Josh Carlson, who both worked at the…