Hacker turns 25 cents into 46 billion fake Bitcoins to steal $770,000 from Symbiosis DeFi exchange

On September 11, DeFi network Symbiosis lost about $770,000 (9.97 BTC) due to two smart contract vulnerabilities. The attacker gained admin rights, set a negative fee, and issued 46 billion unbacked syBTC, exchanging them for BTCB, cbBTC, WBTC, and RBTC.

• Loss amounted to $770,000, or 9.97 BTC
• Hacker spent 330 satoshi (about $0.25) on the attack
• 46 billion syBTC issued against a 21 million BTC limit
• Only about $336,000 was withdrawn to fiat via Uniswap