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The compromised vendor

A real invoice, from a real supplier, sent from their real email account. With new banking details. Here is why nothing about it looks fake, and what actually catches it.

Illustrative scenario. This walkthrough is a composite built from attack patterns LANTEK sees in South African businesses. It does not depict a real client, and the names, figures and organisations in it are invented.

The control was a telephone call.

Verification of any change to banking details, by telephone, on a number you already had, is not bureaucracy. It is the only control that would have caught this one.

Everything else in this story was working correctly. The filter was right, the sender really was genuine, and the email really was sent from his account. The gap was not in the technology. It was the absence of one rule, applied every time, without exception.

Keep going

02 The session hijack A normal login on normal WiFi, and someone sitting quietly in the middle of it. Caught in minutes → 03 The night nobody was watching One mailbox, five client businesses, one long weekend. The damage was not to them. Five clients, one mailbox → 04 Ransomware, the worst morning The worst morning of the year, told from the moment somebody unlocks the front door. Stopped cold →

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