An unknown attacker drained thousands of wallets containing untold millions of dollars worth of Solana and USDC late Tuesday night. The hack, which was still ongoing at 8:00 PM PST, seemed to originate on the Solana browser wallet Phantom and was believed to compromise user keys—possibly involving seedphrases that were re-used among wallets on different chains
“Over 5,000 Solana wallets have been drained in the past few hours,” blockchain audit firm OtterSec reported earlier in the evening. “These transactions are being signed by the actual owners, suggesting some sort of private key compromise.” Watcher Guru updated the count to 8,000 a short while later.
Engineers across the Internet, including blockchains other than Solana, were working together to try and understand both the cause of the exploit and its extent. “We are actively communicating with the affected wallet teams to offer our help and monitor if there is anything we can do to keep our users safer,” a spokesperson for the Ethereum wallet MetaMask told Decrypt.
Initial reports singled out the Solana browser wallet Phantom and the Solana ecosystem. The news has already prompted an 8% drop in Solana’s value in the two hours following the first reports of the attack, according to CoinMarketCap, which also notes a 45 percent increase in trading volume in the last 24 hours.
“There’s an unknown $SOL exploit currently draining random Phantom wallets,” said crypto investor and analyst Miles Deutscher. “$6m currently stolen. If you have funds on Phantom, make sure to revoke all permissions + move to a hardware wallet.”
Popular Solana NFT marketplace Magic Eden also took to Twitter to warn of the exploit.
“There seems to be a widespread SOL exploit at play that’s draining wallets throughout the ecosystem,” the account wrote. In the tweet, Magic Eden provided instructions to remove permissions for suspicious links.
Phantom says it is investigating the reported exploits.
“We are working closely with other teams to get to the bottom of a reported vulnerability in the Solana ecosystem,” Phantom tweeted. “At this time, the team does not believe this is a Phantom-specific issue. As soon as we gather more information, we will issue an update.”
But the attack does not appear to be limited to Solana. Another user reported his USDC balance was drained as well.
Twitter user Justin”Justin.sol” Barlow posted: “My ERC-20 and SPL USDC held on both @slope_finance and @TrustWallet were drained.”
Crypto analyst and author @0xfoobar confirmed that “the attacker is stealing both native tokens (SOL) and SPL tokens (USDC)… affecting wallets that have been inactive for less than 6 months.”
Theorizing that it might be an “upstream dependency supply chain attack,” he added that the widespread advice of revoking wallet approvals will probably not help — only transferring to an offline hardware wallet.
“These SOL and SPL transfers are signed by the users themselves, not transferred away by a third party using approvals,” @0xfoobar explains. “So while you can revoke, it’s likely something has caused widespread private key compromise.”
“There is no way an ‘interaction’ could make a wallet vulnerable,” Solana Labs cofounder Anatoly Yakovenko further clarified.
“Only a token specific delegation or an auto approve or a leaked seed could transfer assets from a wallet on behalf of the user,” Yakovenko wrote. “Since system transfers are happening, that rules out delegation.”
The exploit follows on the heels of yesterday’s Nomad Bridge hack, in which a hacker or hackers made off with some $190 million.
This is a developing story and will be updated as details emerge.
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