According to The Verge, a bot in the channel made a fake announcement that the NFT marketplace was partnering with YouTube and that users should click on a “YouTube Genesis Mint Pass” in order to get one of 100 free NFTs before they’re gone forever.
Just like cybercriminals often do in phishing emails, this message instilled a sense of urgency to get users to click on a link to a site that that blockchain security company PeckShield has now flagged as a phishing site.
At the same time, as the NFT space tends to move rather quickly, users knew from past experience that they only had a limited time to claim one of the free NFTs and likely didn’t want to miss out.
Although the malicious messages have been removed from OpenSea’s Discord channel and the phishing site has also been taken down, one user said they lost NFTs in the incident and pointed to an address on the blockchain that belonged to the cybercriminals responsible.
Viewing the address on Etherscan.io or on competing NFT marketplace Rarible shows that 13 NFTs were actually transferred to it from five users around the time of the attack and based on their prices when last sold, all five NFTs appear to be worth just over $18k.
While OpenSea hasn’t yet explained how its Discord channel was hacked, one possible explanation is that the cybercriminals leveraged the webhook functionality that organizations utilize to control bots which make posts on their channels.
In a statement to The Verge, OpenSea spokesperson Allie Mack provided further details on how the company responded to the incident, saying:
“Last night, an attacker was able to post malicious links in several of our Discord channels. We noticed the malicious links soon after they were posted and took immediate steps to remedy the situation, including removing the malicious bots and accounts. We also alerted our community via our Twitter support channel to not click any links in our Discord. Our preliminary analysis indicates that the attack had limited impact. We are currently aware of fewer than 10 impacted wallets and stolen items amounting to less than 10 ETH.”
Via The Verge