Fake Renewal Calendar Invites Used to Harvest Credentials – Malwarebytes Alerts

Malwarebytes uncovered a coordinated campaign distributing fraudulent calendar invitations that mimic subscription renewal reminders. The invites contain malicious URLs that, when clicked, direct victims to credential‑phishing pages designed to capture login details for corporate services. Attackers rely on the legitimacy of calendar events to bypass typical email filters and exploit users’ trust in scheduled notifications.

The campaign poses a direct risk of credential compromise, enabling attackers to gain footholds for further intrusion, lateral movement, and data exfiltration. Defenders should update URL filtering rules, monitor calendar traffic for anomalous invites, and educate users to verify renewal notices through official channels before clicking any links. Early detection and blocking of these invites can prevent credential theft and limit the attack surface.

Categories: Threat Intelligence, Security Culture & Human Factors

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