In July 2025, the cryptocurrency exchange BigONE attracted community attention when it reported a hacker attack resulting in losses exceeding $27 million.
How the Hack Happened?
According to an official statement from BigONE, the attack targeted its production network, allowing hackers to bypass defenses. Key servers responsible for account management and risk control were compromised, enabling withdrawals without the need for stolen private keys.
Suspicious Wallet Movements Detected
Blockchain security firm CertiK Alert observed unusual activity from wallet address 0xd4d…d93f. This wallet was used to transfer stolen tokens. Subsequently, the stolen assets were sent to another wallet, 0x0a3…05f4f, which now holds approximately $4 million in Ethereum (ETH) and other tokens.
Quick Action and Compensation Plan
BigONE's team acted swiftly to contain the situation, blocking the attack path and preventing further losses. The exchange stated it will cover all user losses and that private keys remain safe. Currently, deposit, withdrawal, and trading services have been temporarily paused for a full system review.
The situation at BigONE exchange highlights the importance of cybersecurity in the industry. Exchanges must improve their systems to prevent similar incidents in the future.
