Atomic Stealer

Anthropic has detected a wave of infostealer malware campaigns that hijack Claude user accounts to mine AI tokens, and has begun signing affected users out and removing saved payment methods to stop t…

Anthropic began contacting affected Claude users on August 30, 2026, after discovering that infostealer malware had compromised their computers and stolen active login session cookies, allowing attack…

Anthropic has begun locking users out of their Claude accounts after login sessions were hijacked by infostealer malware, including Vidar, Lumma (LummaC2), StealC, RedLine, Acreed on Windows, and Atom…