Infostealers and Session-Token Theft: Why MFA Alone Is Not Enough

Some malware targets browser session cookies as well as saved passwords. A stolen session cookie may let someone access a web service as an already authenticated user, which can bypass some sign-in checks for that session.

Reduce exposure with a short review:

• Keep the operating system, browser, and security software updated.
• Install software and extensions only from sources you can verify; remove extensions you no longer need.
• Use a separate browser profile for high-impact accounts so fewer extensions and sites can access that session.
• Sign out of sensitive services on shared devices and revoke sessions after a suspected compromise.
• Use phishing-resistant authentication where the provider supports it; MFA still helps, but it cannot invalidate a session token that has already been stolen.

If a device may be infected, use a separate trusted device to change passwords and revoke sessions, then get qualified help before relying on the old device again. This note describes a defensive review; it does not provide malware analysis or incident response for an active compromise.