Case Study: Greenhill stops cyberattacks and prevents Office 365 account takeovers with Vectra AI Inc.'s Cognito NDR

Greenhill stops cyberattacks from enterprise to Office 365 SaaS

Greenhill & Co., a New York–based investment bank advising on major mergers, acquisitions and restructurings, needed better network visibility and a faster way to separate critical threats from noisy firewall logs. The firm was particularly concerned about rising credential abuse and account takeovers in Microsoft Office 365 and wanted to reduce both business and cyber risk without overburdening its security team.

Greenhill deployed Vectra’s Cognito Detect NDR, an AI-driven platform that analyzes network and Office 365 telemetry, automates Tier‑1/2 triage, and enriches detections with user, device and attack context. The result: fewer false alarms and less alert fatigue, faster investigations and proactive threat hunting, and confident detection and stoppage of privilege escalation and Office 365 account takeovers—while integrating with endpoint and SIEM tools to contain attacks end-to-end.

Greenhill

John Shaffer

Chief Information Officer