Study reveals North Korean cyber-espionage has reached new heights

Spying unit is widening its operations into aerospace and defence industries, according to US security firm

An increasingly sophisticated North Korean cyber-espionage unit is using its skills to widen spying operations to aerospace and defence industries, a new study has revealed.

FireEye, a US private security company that tracks cyber-attackers around the world, has identified a North Korean group, which it names APT37 (Reaper) and which it says is using malware to infiltrate computer networks.