the oldest hacking method brings in enormous cash because everybody forgot about his phones
"Hackers had broken into the phone network of the company, Foreman Seeley Fountain Architecture, and routed $166,000 worth of calls from the firm to premium-rate telephone numbers in Gambia, Somalia and the Maldives. It would have taken 34 years for the firm to run up those charges legitimately, based on its typical phone bill, according to a complaint it filed with the Federal Communications Commission.
The firm, in Norcross, Ga., was the victim of an age-old fraud that has found new life now that most corporate phone lines run over the Internet.
The swindle, which on the web is easier to pull off and more profitable, affects mostly small businesses and cost victims $4.73 billion globally last year. That is up nearly $1 billion from 2011, according to the Communications Fraud Control Association, an industry group financed by carriers and law-enforcement agencies to tackle communications fraud.
these attacks on your pbx also happen in Belgium and there is very little you can do about it if you didn't place a firewall or some very specific infrastructure before it and strict controls and real-time alerts on it
we always forget about our telephone infrastructure but we forget that they also can be used to penetrate networks and they can be used to deroute communications (sometimes in a circle so that investigators will never find who is the real victim or target) and telecom operators don't pay back and you aren't insured for this either so all that money is lost