An Invoice You Don't Recognize

How it works

You receive an overdue invoice for software, subscriptions, or services you never purchased. The email demands immediate payment.

Some versions are after the payment. Others want you to call the "billing department" to cancel, where the operator walks you into installing remote-access software.

Red flags

• A renewal for antivirus, Geek Squad or a subscription you don't have
• A phone number for cancellation, but no account portal
• An attachment that must be opened to see the details

If it already happened

If you already clicked and signed in: change that password now, from the real site, and turn on multi-factor authentication. If you sent money, call your bank immediately; wire and ACH recalls work best in the first hours. Tell your IT provider so they can check for forwarding rules and other sign-ins on the account.

Where OpenEFA fits

OpenEFA MailGuard blocks most of these before they reach an inbox. The ones that get through are usually the most carefully targeted, which is why your people still need to know the pattern.

Part of the OpenEFA MailGuard Scam Watch series. Published October 21, 2026 by the EFA Security team. Share it freely; a link back is appreciated.