Attack on a telephone exchange


After receiving an alert from the telephone operator, a company in the financial sector situated in France was surprised to discover an unusually high invoice for a large number of international calls placed from its telephone exchange. Over the course of one weekend, the bill was more than 30,000 euros. The company reported being the victim of hackers taking over its telephone exchange.


In response to the incident, GM Consultant was called in to identify the method used in the cyber-attack and the vulnerability used on the telephone exchange, to define the scope of the attack, and to recommend protective measures to be put in place to stop the attack.