Eagle Materials Stops Advanced Phishing Attacks with Zero-Trust Email Security

Eagle Materials is a leading manufacturer of building materials and construction products serving customers across the United States. With a three-person security team responsible for protecting 2,500 users, the organization relies on automation and strategic security investments to scale protection and stay ahead of an evolving threat landscape. For Tom Sipes, Director of Information Security, that means constantly seeking technologies that strengthen existing defenses and surface threats that might otherwise go undetected.

CHALLENGE

Threats That Evade Traditional Email Defenses

Despite having a secure email gateway in place, Eagle Materials found that sophisticated phishing campaigns and social engineering attacks were still slipping through.

Among the new threats were malicious calendar invitation campaigns, where attackers used meeting invites to deliver phishing content, malicious links, QR codes, and callback scams — content that could reach users even when traditional defenses successfully blocked or quarantined the original email, since many calendar apps automatically add invitations upon delivery. Investigating each suspicious email and invitation took real time, and for a small team responsible for the entire organization, every hour spent on manual triage reduced their capacity to address the next threat.

SOLUTION

Reduced Manual Triage, Strengthened Detection

Eagle Materials deployed Varonis Interceptor to improve detection coverage and reduce the burden of manual investigation. Interceptor analyzes email activity, user behavior, and communication patterns to surface suspicious activity — and during deployment, it immediately began catching threats that had bypassed existing controls.

Beyond detection, Interceptor provided context around suspicious messages, helping the team quickly understand a threat's nature and impact. Combined with automated remediation that keeps malicious messages out of user inboxes, it let Eagle Materials investigate and contain threats more efficiently while cutting time spent on manual triage.

Around-the-Clock Threat Coverage with MDDR

Eagle Materials also benefits from Varonis Managed Data Detection and Response (MDDR) extended to email security, giving the team access to experienced analysts who continuously monitor, investigate, and validate threats. For a lean team, the value wasn't just more alerts — it was having experts help determine which threats required action and assist with response when needed.

RESULTS

Confidence Around the Clock

With Varonis Interceptor, Eagle Materials has improved protection against emerging techniques like calendar phishing, reduced time spent investigating suspicious activity, accelerated threat containment through automation, and extended the effectiveness of a lean security team without adding headcount.

By combining multi-modal analysis with a zero-trust email security architecture, threats are detected faster and investigations require less effort — and paired with Varonis MDDR, Interceptor helps Eagle Materials' small security team operate efficiently and protect against evolving attacks around the clock.