How do attackers use infostealer logs to gain access?

Stolen infostealer logs give attackers everything they need to impersonate real users โ€” without logging in, triggering MFA, or raising alerts. These access methods vary in technique, but all exploit existing trust.

  • Session hijacking โ€” attackers take over active sessions using stolen cookies, bypassing authentication

  • Token replay attacks โ€” stolen tokens are reused to initiate new sessions via API or browser injection

  • Password-based logins โ€” many logs contain credentials for systems without MFA or with fallback logins

Once inside, attackers often:

  • Abuse trust to escalate โ€” sending internal messages or requests to trick others, reset credentials, or gain deeper access

  • Move laterally โ€” using internal integrations or single sign-on to navigate between systems

Because attackers use valid sessions or credentials, access looks legitimate โ€” and often bypasses detection entirely.