Stealer logs are the output files produced when infostealer malware finishes harvesting data from a compromised machine. A single log can contain usernames, passwords, cookie jars, browser autofill entries, installed software, IP addresses, and hardware identifiers. Criminals buy, sell, and trade these logs on Telegram channels, private forums, and lookup services.
For defenders, stealer logs are uniquely valuable because they reveal what an attacker already has before an intrusion escalates. If an employee's corporate SSO cookie appears in a log, that is a concrete exposure event, not a theoretical risk. Hudson Rock indexes stealer logs at scale so teams can search by domain, email, or username and respond before credentials are weaponized.
Learn why raw ULP (URLs, logins, passwords) data is overwhelming SOC teams in our analysis of infostealer ULP data burnout, and how lookup services changed the initial access market in the new era of infostealer lookup services.