Sophos, a global leader in network and endpoint security, today announced that it has acquired Rook Security, a pioneer and leader in managed detection and response (MDR) services. Rook Security provides a 24/7 team of cyberthreat hunters and incident response experts who monitor, hunt for, analyze and respond to security incidents for businesses of all sizes. The privately-owned company was founded in 2008 and is headquartered in Indianapolis, Ind.