MALWAREBYTES warns of a scam campaign that floods calendars with fake renewal notices impersonating Malwarebytes in an attempt to spur victims into calling a “billing support” number. The fake invites are designed to look like receipts for large charges, usually for multiple years of service, with the goal of prompting an immediate phone call rather than any online action.
If you do call, scammers pressure you to disclose payment details, install remote-access software, or send money, and they may try to harvest personal information for later fraud. The article also shows examples of the fake calendar entries and lists several phone numbers connected to these schemes, emphasising red flags such as unusual phrasing, inconsistent formatting, and calendar events you didn’t schedule.
Published on 13 March 2026 by Pieter Arntz, the piece also provides guidance on recognising and removing fake entries from various calendar apps and preventing calendar spam. It recommends turning off auto-add, restricting calendar permissions, and using an up-to-date anti-malware solution to block known malicious domains.