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This paper proposes a attack index to detect stealth attacks on current sensor information in a distributed controlled dc microgrids. Stealth attacks are considered the intelligent false data injection attack where it satisfies consensus algorithm objectives in the secondary control. This particular study is carried out on a secondary controller, which is highly prone to cyber-attacks due to involved communication. An attack index (AI) is calculated to detect the stealth attack on the current sensor information, which effectively identifies the stealth attack with existing low bandwidth communication. A stealth attack on current sensor information to the dc microgrid's secondary controller is simulated using Matlab/Simulink environment, and attack detection results are presented and verified with the experimental results.