Operation Socialist: How GCHQ Spies Hacked Belgium’s Largest Telco

The Belgacom hack, he said, is the “first documented example to show one EU member state mounting a cyber attack on another…a breathtaking example of the scale of the state-sponsored hacking problem.” Publicly, Belgacom has played down the extent of the compromise, insisting that only its internal systems were breached and that customers’ data was never found to have been at risk. But secret GCHQ documents show the agency gained access far beyond Belgacom’s internal employee computers and was able to grab encrypted and unencrypted streams of private communications handled by the company.

https://firstlook.org/theintercept/2014/12/13/belgacom-hack-gchq-inside-story/