Hackers Steal Claude Login Sessions With Infostealer Malware to Hijack Accounts

Anthropic’s Claude AI platform has become an active target for cybercriminals, with two distinct attack chains now confirmed to be stealing credentials, hijacking paid usage, and reinfecting devices even after cleanup. The company has begun signing out compromised accounts, stripping saved payment methods, and issuing refunds as it works to contain the damage. According to Anthropic’s own advisory, infostealer malware families including Vidar, Lumma (LummaC2), StealC, RedLine, and Acreed on Windows, along with Atomic Stealer on macOS, have been quietly copying saved passwords, browser cookies, and locally stored credentials from infected machines. Claude Notice Because these tools steal already-authenticated...

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