Passguard Infostealer Scanner is a threat detection tool that scans domains for potential infostealer malware infections. The tool provides domain-based scanning capabilities that check for compromised devices and sessions within an organization's infrastructure. The scanner monitors criminal marketplaces where stolen credentials and session data from infostealer malware are sold. When infected devices or sessions associated with a scanned domain are detected on these underground markets, the tool provides alerts to notify security teams. The platform offers a free scanning option that allows users to check their domain for infostealer infections. After completing verification, users can initiate scans and begin monitoring their domain for potential compromises. The tool focuses specifically on infostealer malware threats, which are designed to extract sensitive information such as credentials, session tokens, and other data from infected systems. By monitoring where this stolen data appears for sale, the scanner helps organizations identify when their employees or systems may have been compromised by infostealer infections. The service includes an API for integration into existing security workflows and provides ongoing monitoring capabilities beyond the initial scan.