How to Check If You Appear in Stealer Logs

Introduction to the problem

Information stealers quietly capture credentials and other data from end-user systems, then send everything back to an attacker-controlled server. The result is a stealer log for each infected machine—a structured archive that can include hundreds of saved passwords, cookies, and application secrets. For defenders, understanding whether their users appear in these logs is critical for assessing risk.

Because stealer logs are typically traded or shared in closed channels, most organizations cannot observe them directly. Instead, they rely on specialized intelligence providers that ingest and index logs from many different malware families. A stealer log check allows you to safely ask: "Do any known logs contain accounts associated with my domain or email addresses?"

Where credential leaks come from (breaches, stealer malware, phishing)

Stealer logs sit alongside traditional breach data as a major source of exposed credentials. While large breaches compromise centralized databases, infostealers operate on individual endpoints, pulling secrets directly from browsers, password managers, and applications installed on each system. This endpoint perspective often reveals credentials that never pass through centralized authentication stores or password databases.

Phishing acts as a common infection vector for infostealers, luring users into opening malicious attachments or executing trojanized installers. Once the malware runs, it harvests data, bundles it into a log, and exfiltrates it to the attacker. These logs may later be combined with other breach data, building detailed profiles of affected users across multiple services and devices.

Over time, credentials from breaches, stealer logs, and phishing campaigns end up in large combined data sets that attackers use for credential stuffing and targeted account takeover. Detecting whether your domain appears in stealer logs is therefore an important part of understanding your overall exposure surface.

Why exposed credentials are dangerous

Unlike many database breaches that may contain hashed passwords, data in stealer logs is typically captured in plaintext. Attackers can immediately log in with these credentials or hijack active sessions using stolen cookies, often bypassing multi-factor authentication in the process. This makes stealer log exposure particularly high-risk for organizations that rely heavily on web applications and SaaS platforms.

Credentials in stealer logs frequently include access to corporate VPNs, internal tools, administrative panels, and privileged cloud accounts. Because the logs also contain metadata about the infected system, attackers can identify which entries belong to employees at a specific company or within a particular industry. Those high-value entries are often sold separately or used by specialized groups focused on targeted intrusions.

For defenders, a single exposed corporate credential in a stealer log can be the starting point for lateral movement, data theft, or ransomware deployment. Discovering that exposure early allows teams to rotate credentials, revoke sessions, and investigate the underlying infection before attackers fully exploit the access.

How organizations detect credential exposure

To understand their exposure in stealer logs, organizations partner with providers that continuously ingest new logs from multiple malware families and distribution channels. These providers normalize the data and index it by email address, domain, and other identifiers, allowing security teams to search for their own assets without downloading or handling the raw stolen data directly.

When a match is found, analysts review associated metadata such as the affected email address, application name, and approximate infection timestamp. This helps them prioritize response actions—forcing password resets, revoking tokens, enabling or enforcing multi-factor authentication, and coordinating with endpoint teams to remediate the underlying malware infection on the user's device.

Many teams also correlate stealer log exposure with authentication logs and endpoint telemetry to determine whether the exposed credentials have already been abused. This combination of external intelligence and internal monitoring creates a fuller picture of both exposure and impact.

How to check if your domain or email is exposed

A stealer log check typically starts with a domain or specific email address. Instead of sharing passwords, you provide identifiers that can be matched against known data sets indexed by exposure monitoring platforms. The goal is to answer whether accounts associated with those identifiers appear in the logs, not to retrieve or reuse the stolen credentials themselves.

When you run this kind of check, you should expect high-level results that help you prioritize response, such as which services or applications were involved and rough timelines of when the exposure occurred. Based on that information, you can coordinate password resets, revoke active sessions, and review login activity for signs of misuse on the affected accounts.

Because new stealer logs are generated every day, organizations treat this as a continuous process rather than a single scan. Regularly checking key domains and role-based accounts helps catch fresh exposures quickly.

Check Your Exposure

LeakyCreds provides a scanner that lets you check whether domains or email addresses associated with your organization appear in known credential leaks. It is designed as a detection tool—not a replacement for access controls—so you can use the results to drive password rotation, session revocation, and broader identity security improvements.