"A popular wallet system for storing the Ethereum Classic (ETC) cryptocurrency has been hacked, and users are urged to refrain from using the service for now.
At about 11pm BST on Thursday 29 June, Classic Ether Wallet was hijacked by a hacker who used social engineering to trick the wallet service's web host into giving them access. The hacker called German web host 1and1's customer support, pretending to be the owner of the domain.
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The hacker convinced 1and1 to give them gain access to the site's domain registration, then changed the domain's settings to point the domain at their own hostile server."
For more information, and to find out if you're secure:
Source IBTIMES