British intelligence and security organisation GCHQ hacked Belgian telecommunications company Belgacom via spoof employee LinkedIn profiles.

The top secret' project was leaked by NSA whistleblower Edward Snowden in a presentation and revealed the victim would not have known they were being watched because the malware was invisible to them.

Profiles would have displayed as normal despite being fake set-ups, not hosted on LinkedIn - but the malware allowed intelligence officers to access their computers.

The majority of those targeted worked in network maintenance and security for the company.

LinkedIn has denied having anything to do with the hack, saying it takes the privacy of its users very seriously and "does not sanction the creation or use of fake LinkedIn profiles or the exploitation of its platform for the purposes alleged in this report. To be clear, LinkedIn would not authorise such activity for any purpose,' and was not notified of the alleged activity."

When the GCHQ had managed to access the computers of engineers, they were able to access information about the company and its subsidiary BICS, which operates a GRX router system that allows people to make and receive calls or use data abroad.

This enabled the organisation to access data about the locations of targets and who they are communicating with.