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Infostealers are hijacking Claude accounts at users’ expense

medmalwarebytes_blogPublished 2026-09-01

<p class="wp-block-paragraph">Anthropic has <a href="https://www.reddit.com/r/ClaudeAI/comments/1w1jqsh/thank_you_anthropic_really/" rel="noreferrer noopener nofollow" target="_blank">warned some Claude users</a> that criminals are using information stealers to take over their accounts.</p>

<p class="wp-block-paragraph">Rather than guessing passwords or intercepting two-factor authentication (2

MITRE ATT&CK techniques

Indicators of compromise

Original source: https://www.malwarebytes.com/blog/news/2026/09/infostealers-are-hijacking-claude-accounts-at-users-expense