Many security breaches begin not with sophisticated exploits but with stolen credentials or session cookies. Infostealer malware harvests saved passwords, browser cookies, and authentication tokens from unmanaged or personal devices, then distributes this data through criminal marketplaces. Even organizations with MFA and zero-trust controls remain vulnerable because stolen session cookies can bypass authentication entirely. A practical credential and session exposure monitoring program should track compromised emails/passwords, infostealer logs tied to company domains, leaked session cookies, and contextual signals like malware family and exposure recency. Early detection allows teams to reset credentials, revoke sessions, and investigate devices before an exposure escalates into a ransomware incident. The post also introduces Lunar, a free tool that monitors compromised credentials and session data associated with verified company domains.
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