Case Study: D2C Inc. achieves clear internal-network visibility and automated threat response with Trend Micro Deep Discovery Inspector

A clear view into their internal network enabled D2C to identify and respond to threats

D2C Inc., a Tokyo-based digital marketing company founded by NTT Docomo, Dentsu and NTT Advertising, needed better internal visibility after an email-service incident revealed potential information leaks. Although the company held privacy and ISMS certifications and had centralized endpoint protection, rising targeted attacks and the inability to see or respond to threats inside the network made visualization and faster threat detection urgent.

D2C deployed Trend Micro Deep Discovery Inspector alongside OfficeScan and Connected Threat Defense to monitor mirrored traffic, sandbox suspicious files, and share detections via Control Manager for automated isolation and blocking. The solution delivered clear internal visibility, company-wide threat prioritization, and automatic response capabilities that halved security operations workload, handled surges of suspicious email (notably during WannaCry) without business impact, and made reporting to management simpler and more accurate.

D2C Inc.

Yosuke Nohiro

Assistant Manager, Group Management Department, Corporate Division