An anonymous reader writes: German steel manufacturer ThyssenKrupp has been hacked in a major cyberattack, coordinated by unnamed malicious actors based in south-east Asia. The large-scale attack was targeted at the German firm to steal its technical trade secrets. Martin Hölze, CIO at ThyssenKrupp said that the company had been the target of a ‘very professional hacker attack since February.’ The breach was executed through hidden backdoors in the IT systems which were used to gain access to the steel giant’s valuable intellectual property. ThyssenKrupp said that the attack was uncovered in April by its own in-house computer emergency response team (CERT), which has since cleaned and re-secured the infected systems. State and federal cyber security and data protection agencies were informed of the hack. A criminal complaint was also lodged with police in the state of North Rhine-Westphalia.