Scammers Use Inferno Drainer to Steal $43K from CoinMarketCap Users

A coordinated crypto theft operation targeting CoinMarketCap users has been exposed after leaked images surfaced from a Telegram channel known as TheCommsLeaks. The attack used a convincing wallet connection prompt embedded in CoinMarketCap’s own interface, tricking users into handing over access to their wallets. The result? more than $43,000 worth of crypto funds drained in hours.

According to Tammy H, a Senior Threat Intelligence Researcher and Certified Dark Web Investigator at Flare.io, a Canada-based cybercrime intelligence firm, the attack was carried out using Inferno Drainer, a known wallet-draining toolkit that’s been linked to previous campaigns.

The method was simple but effective. Users visiting CoinMarketCap were presented with a prompt asking them to “Verify Your Wallet” to access features. It looked identical to legitimate pop-ups seen on the platform, giving users no reason to doubt it. However, once connected, wallets were quietly emptied of whatever assets they held.

A source cited in the leak claimed the prompt appeared across nearly every page on the site. “Make it where it appears on every page,” read one message. “Most people have coins pinned… the second they render the site.”

The attacker seemed focused on increasing visibility and maximizing wallet connections. Some reports suggest that even the connect button began malfunctioning due to being rendered too many times.

As per Tommy H’s analysis, the Telegram channel TheCommsLeaks began sharing details around 7:30 PM local time on June 20. The messages included screenshots showing a live dashboard used by the attacker. These visuals displayed wallet connections, token transfers and total values drained in real time.

Early numbers showed 67 successful hits and over 1,300 wallet connections. The payout was already past $21,000 within the first wave. By the time the campaign ended, the final haul had climbed to $43,266, drained from 110 victims.

Tokens siphoned off included SOL, XRP, EVT, and smaller coins like PENGU and SHDW. One transaction involving $1,769 in XRP was linked to a wallet visible on BscScan, offering public confirmation of the theft.

However, the researcher noted that not every attempt succeeded. Logs from the attacker’s toolkit also showed multiple failed drains, typically due to wallets holding unsupported tokens or negligible balances.

After growing speculation over whether the attack came from a spoofed domain, CoinMarketCap addressed the issue directly. In a statement published on X, the company said a doodle image displayed on their homepage had triggered malicious code through an embedded API call. This vulnerability caused the unauthorized wallet prompt to appear for some users.

The company confirmed that its security team responded immediately after detecting the issue. The malicious content was removed, and internal systems were patched to prevent further abuse.

“All systems are now fully operational, and CoinMarketCap is safe and secure for all users,” the company stated, adding that it continues to monitor the situation and provide support.

This incident goes on to show how small interface changes, even those involving something as harmless as a homepage doodle, can be leveraged for large-scale damage. While the use of a legitimate platform’s own environment to deploy malicious prompts is extremely concerning, it reflects how easily trust in familiar interfaces can be misused.

In a separate incident reported by Hackread just last week, scammers exploited search ads to trick users into calling fake support numbers shown on real websites like Apple and PayPal. Though technically unrelated, both cases show how attackers rely on user assumptions about what’s safe to interact with online.

For now, users are advised to avoid connecting wallets directly through pop-ups and verify any prompt against the platform’s official guidance. If something looks familiar, that doesn’t always mean it’s safe.