“Belgium’s largest telecom, Belgacom, was hacked for at least a few years, according to national newspaper De Standaard.
The paper wrote on Monday that ‘everything suggests’ (Google Translate) that the culprit was the National Security Agency (NSA). De Standaard reports that after an internal security check in June 2013, technicians found an ‘unknown virus’ that had been installed across a ‘few dozen computers,’ and that the malware seemed to be targeting traffic on Belgacom International Carrier Services (BICS), a subsidiary that works primarily with other telcos in the Middle East and Africa.”
Source:Major Belgian telco targeted by a foreign state, Brussels says | Ars Technica