Compromised Credentials, Session Hijacking & Identity Defense
Incident response protocol for compromised employee credentials, infostealer logs, and stolen browser session tokens. Revocation, MFA enforcement, and token flushing.
1Phase 1: Immediate Session & Token Revocation
Invalidate All Active SSO Refresh & Access Tokens
Terminating the user's password alone does NOT kill existing OAuth2 refresh tokens or browser session cookies. Force an explicit global session revocation across IdPs.
Review Infostealer Dark Web Disclosures
Cross-reference the compromised email with recent Lumma, RedLine, and Vidar stealer dump telemetry to see what browser auto-fill secrets were harvested.
2Phase 2: Device Posture & Phishing-Resistant MFA Enforcement
Isolate Endpoint for Infostealer Malware Removal
If credentials leaked via an infostealer Trojan, changing credentials on the infected workstation will re-leak them instantly. Quarantine the endpoint before resetting credentials.
Enforce Hardware FIDO2 / WebAuthn Authentication
Upgrade the compromised user account to phishing-resistant hardware security keys (YubiKey) or biometric passkeys to render intercepted passwords useless.
3Phase 3: Blast Radius Audit, Forensic Log Review & Hardening
Audit OAuth App Authorizations & Hidden Inbox Forwarding Rules
Verify whether the adversary registered malicious OAuth enterprise applications or created hidden Outlook/Gmail forwarding rules during the intrusion window.
Revoke Legacy Authentication Protocols Globally
Permanently block legacy protocols (Basic Auth, POP3, IMAP, ActiveSync) across all mailboxes and tenants to eliminate credential replay vectors.
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