Sky Mavis’ Ronin Network Bridge Exploited for Over $625M

Ronin Network, an Ethereum-linked sidechain used for blockchain game Axie Infinity, was breached. Hackers exploited the network for roughly $625 million, or 173,600 ether and 25.5 million USDC, according to a Tuesday statement.

Exploiters, per the network’s post, used hacked private keys to forge withdrawals on March 23. The breach, however, wasn’t discovered until Tuesday, when a user was unable to withdraw 5,000 ETH.

Ethereum and USDC deposits on Ronin have been drained from its bridge contract. Users, as of now, are unable to withdraw or deposit funds. The Ronin Bridge and Katana DEX, as a result, have been halted.

“Sky Mavis’ Ronin chain currently consists of 9 validator nodes. In order to recognize a Deposit event or a Withdrawal event, five out of the nine validator signatures are needed,” the blogpost said. “The attacker managed to get control over Sky Mavis’s four Ronin Validators and a third-party validator run by Axie DAO.”

Sky Mavis, the creator of Axie Infinity, said it is “committed to ensuring that all of the drained funds are recovered or reimbursed.”

“We are working with law enforcement officials, forensic cryptographers, and our investors to make sure that all funds are recovered or reimbursed,” the network said in a tweet. 

Most of the stolen ETH remains in the attacker’s wallet, but 6,250 ETH (about $21 million) has been transferred out, including hundreds of ETH sent to the FTX Exchange.

All $25.5 million in USDC has been transferred out to various wallets and DeFi protocols, according to Etherscan.

RON, the native token of the Ronin Network, is down 23% on the news, according to CoinMarketCap.

This is a developing story and may be updated as new information becomes available.

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