An infostealer is malware designed to collect valuable data from a device, such as passwords, browser cookies, authentication tokens, saved payment data, and sometimes crypto wallet material.
The attacker's advantage is speed: stolen data is often sold or used quickly to create persistent sessions and pivot into more accounts.
Why it matters for account recovery
Infostealers can compromise accounts even after you change a password, because stolen session data can keep an attacker logged in. Recovery is not only 'reset credentials'. It is also about ending sessions and rebuilding from a trusted device.
Common failure modes and misconceptions
- Changing passwords from the infected device: That can hand the new password to the attacker immediately.
- Assuming one account is affected: Infostealers usually harvest broadly across browsers and apps, which makes cross-account cleanup necessary.
- Skipping session revocation: If you do not end sessions and review connected access, the attacker can remain present.
Safe best practices
- Stop using the affected device for sign-ins until you have confidence it is clean.
- Rotate credentials from a trusted device and sign out of other sessions across critical accounts.
- Review connected apps, email forwarding rules, and recovery methods for persistence.
- Assume anything stored in the browser may be exposed and rebuild from the control plane outward.
Related terms
Related guides
- Infostealer malware response: stolen passwords, cookies, and browser sessions
- API key and secrets leak response: contain, rotate, and map blast radius
- How to check if you have been hacked
- Hacked Gmail accounts: how to recover and prevent re-entry
Infostealer recovery is a sequencing problem. First restore a trusted device baseline, then rotate credentials and end sessions, then review recovery and connected access so the same compromise cannot reassert itself.