The statement is kinda contradictory though so I'm unsure.

"The systems Vircurex.com and Cryptostocks.com have been taken offline over the weekend" - suggests some sort of planning and timescale in mind..

yet

"Please do not deposit any further coins to your Vircurex accounts. We must assume that the wallet has been compromised." - suggests something has gone wrong!.

This page was up seconds\one minute after the site was unavailable however...  if they have been compromised the admins have come to some very quick conclusions and posted the message.....

I'm an admin of many systems and it strikes me as strange they posted this message so quickly (very little diagnosis could have been done imo)