You can read little bit about it here
https://bitcointalksearch.org/topic/extortion-and-blackpr-attack-to-worldcore-need-urgent-assistance-2223444
I think they will not answr quick to you, now ICO is goind and there are big rush.
Also there is russian thread, you can read it through translater if you can:
https://bitcointalksearch.org/topic/extortion-and-blackpr-attack-to-worldcore-need-urgent-assistance-2223444
Topic: Worldcore.eu ANN thread closed (what happened) (Read 212 times)
I emailed and message them on facebook they still doesn't response
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