An unknown attacker has gained control over the web domain of Classic Ether Wallet, a client-side wallet system for the ETC cryptocurrency. The attack took place around midnight between Thursday, June 29, and Friday, June 30. The hacker immediately redirected the wallet’s main domain to his own server, and altered transactions in order to redirect funds to his accounts. Users who logged into their accounts on June 30 have exposed their wallet’s private keys, which the hacker used to steal funds from their accounts.
Source: https://www.bleepingcomputer.com/news/security/classic-ether-wallet-hacked-users-report-massive-losses/