By Stefan Dasic, Malware Bytes
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Phishing follows whatever people want at the moment, and right now that includes AI subscriptions they don’t have to pay for. We recently uncovered a new variation on this theme: A fake Claude Max giveaway that uses a convincing Google sign-in window to steal login information.
Claude’s paid plans start at $20 a month and cost considerably more for higher usage limits, while free accounts have stricter limits. That makes the promise of a free upgrade an attractive lure.
Microsoft reported in June that it had seen a growing number of phishing, malicious advertising, and search-based campaigns impersonating services such as ChatGPT, Claude, DeepSeek and Copilot. Some claim that a payment has failed and send you to a fake checkout. Others offer an app download that installs malware.
The campaign we found takes a different approach. There is no form to collect card details and no download. Instead, it offers a free upgrade and asks you to sign in with your Google account.
What the page shows you and what it collects
The site announces that Anthropic has passed 100 million users and is thanking people by giving away 10,000 free one-month subscriptions to Claude Max, its highest-usage plan.
The presentation is careful, down to the real logo and colors, invented five-star reviews, and a long footer whose links lead almost entirely to genuine Anthropic pages. This is probably the most effective trust signal on the site, and it cost the operator nothing.
A counter claims that fewer than 750 of the 10,000 slots remain, dropping by a few every several seconds. Nothing is actually being counted. The number is generated inside your browser and resets when you reload the page, so every visitor sees the same manufactured shortage.
The frequently asked questions repeatedly promise that no payment details are needed. That part is true, which helps make the offer persuasive. Many people associate scams with requests for card details, and this page never asks for them.
What it wants instead is your Google login. Two sign-in options appear, but only one works. The Apple button produces a pre-written notice saying that the method is temporarily unavailable. The email box discards whatever you type into it and triggers the Google button instead. Every route leads to the same place, and the prize is far bigger than the lure suggests.
A Google account can provide access to email, documents, and the password-reset messages for other accounts. If you use Google to sign in to Claude, it could also give the criminals a route into your Claude account. Paid AI accounts are valuable in their own right because their usage allowances cost money. Last month, our research covered infostealers hijacking Claude accounts and using the victims’ paid allowances.