OMG! That's enormous!, sorry for your loss, it would be of great help if you could elaborate where coins where held, is it a multi wallet(If Yes, which wallet ?) how it happen or what you could think have happened ? A malware installation, phishing site and or anything that is more specific.
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Valerian77 => @Harkorede,
i'm sorry about the loss. i wish you will be able to recover partial coin if, not full amount.
i'll suggest any discussion should be made via pm. Harkorede, pls use PM when asking such question(s) in so doing Valerian77, can also reply and post detail info's to you via pm.*
Otherwise, is not adviceable to post such info's on the public board where everyone including the person behind the act can easily access.If the attacker reads this thread he will not get any information that he doesn't have already.
Regarding the method of hacking - it was a RAT attack in electrumdiamond. We understand the function of that malware pretty well now. From that and what was said before I recommend not to install anything whatsoever on your system what has not been electronically signed by a known entity. Virus and Malware check do not help to prevent such a scenario.