For DBS CEO Tan Su Shan, the biggest risk keeping her up at night is not just market volatility or geopolitical shocks, but cyberattacks. "Cyber security. I think the new war is cyber. So what keeps me awake at night is cyber. It's who's going to attack who, and how it's going to happen, how people will get affected," the chief executive of DBS told CNBC on the sidelines of its annual CONVERGE LIVE event in Singapore. Her warning underscores a broader shift in how financial institutions are