Hackers have allegedly stolen $600 million from the popular cryptocurrency service Poly Network. Security experts are calling this one of the largest crypto thefts so far. Poly Network is confirming a breach has taken place, but did not disclose how much was lost.
If you are unfamiliar with Poly Network, it is a China-based decentralized finance (DeFi) platform. The company says a threat actors “exploited vulnerability” to gain access to systems and assign themselves as owners of money moving through the platform.
Specifically, the attackers leveraged a flaw in the “_executeCrossChainTx”. This is a function that handles interoperability communication between blockchains.
“The attacker use this function to pass in carefully constructed data to modify the keeper of the EthCrossChainData contract,” Poly Network stated.
— Poly Network (@PolyNetwork2) August 10, 2021
While Poly is not saying how much was taken, but reports suggest $611 million was stolen in digital tokens. These are representations of the crypto asset that sit in the blockchain. Tokens are associated like coins in the blockchain. In terms of this breach, BowsCoin (BSC) and Ethereum (ETH) tokens were taken.
On Twitter, Poly Network confirmed the attack with the following post:
“We are sorry to announce that #PolyNetwork was attacked on @BinanceChain @ethereum and @0xPolygon Assets had been transferred to hacker’s following addresses: ETH: 0xC8a65Fadf0e0dDAf421F28FEAb69Bf6E2E589963 BSC: 0x0D6e286A7cfD25E0c01fEe9756765D8033B32C71.”
The company says cryptocurrency miners to blacklist any tokens coming from the addresses listed in the tweet. Now Poly is taking legal action to find and prosecute the hackers. It urged the group to return the tokens, with over 340 million given back so far (at time of writing).
$342 million (As of 12 Aug 08:18:29 AM +UTC) of assets had been returned:
The remaining is $268M on Ethereum
— Poly Network (@PolyNetwork2) August 12, 2021
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