Credential leaks and infostealer exposure

The credential leak threat operates differently from most cyber-security risks: the compromised credential is often old, the exposed person is often unaware, and the window between acquisition and exploitation can span years. Infostealer malware harvests credentials, session cookies, and stored authentication tokens from compromised endpoints, then routes the logs to a tiered resale market where corporate access credentials trade for thousands of dollars a session.

The scale is documented. By the close of 2025, researchers tracking the infostealer market found over 8 billion active cookies in circulation, with the majority of corporate credentials appearing in plaintext. Ransomware operators and account-takeover groups routinely confirm that victim credentials had already circulated in prior breach corpora — the attack was possible because the entry point existed undetected in a log that pre-dated the network intrusion.

These briefings cover how infostealer families work, how the market for compromised credentials functions, how a stolen credential translates into account compromise and lateral movement, and what investigation and detection approaches actually reduce the risk. The coverage is practitioner-level: it addresses the mechanics of the attack, not the compliance language that describes it after the fact.