Hudson Rock Review
Infostealer intelligence platform exposing compromised credentials from malware-infected machines worldwide
Quick Verdict
Corporate security teams assessing employee credential exposure from infostealer malware, threat intelligence analysts tracking compromised accounts, and investigators identifying whether a target has had credentials stolen by malware
Pros
- + Infostealer-specific data — credentials stolen by malware, not just breach dumps — often more current than traditional breach databases
- + Caveat (free lookup tool) lets you check any email or domain for compromised credentials without an account
- + Corporate exposure view shows all employees at a domain with compromised machines — single query reveals organizational breach scope
- + Data includes the machine context: operating system, installed software, other credentials on the same machine
- + Actionable for incident response — tells you what was stolen, from which machine, by which malware family
- + Active threat intelligence with recent additions — infostealer market updated continuously
Cons
- − Enterprise pricing is opaque and likely expensive — no public pricing for full API access
- − Coverage depends on what infostealers Hudson Rock has visibility into — doesn't cover all malware families or all regions equally
- − Free Caveat tool shows limited data — full credential details and machine context require enterprise account
- − False positives possible — a compromised credential doesn't always mean active exploitation
- − Data is derived from criminal infrastructure — ethical and legal context matters for how it's collected and used
What Hudson Rock Is
Hudson Rock sells infostealer malware data. They collect stolen credentials from browsers, email clients, and apps. The data comes from criminal markets and botnet logs. Their database has millions of compromised machines worldwide.
Infostealer data differs from traditional breach data. Breach data has credentials from one breached service. Infostealer data has credentials from one compromised machine. This provides a broader view of compromised accounts. Some may not be in major breach lists, including leaked credentials from various sources.
Hudson Rock offers a free lookup tool called Cavalier. Users can go to caveat.hudsonrock.com and type an email address or corporate domain to see if Hudson Rock has data on employees with leaked credentials.
Why Infostealer Data Is Different
Traditional breach intel services like HaveIBeenPwned, DeHashed, and Intel X index credentials from known breaches. Credentials are all they have. They age quickly; users change passwords, sometimes daily. Missed exposures pile up.
Infostealer data paints a broader picture. When malware infects a machine, it grabs more than just credentials. It collects a wider range of sensitive information, including browser history, cookies, screenshots, and system information.
- Browser-stored usernames and passwords
- Cookies and session tokens
- FTP credentials, VPN configurations, and email account credentials
- Credit card numbers and form autofill data
- Cryptocurrency wallet files
Stolen data hits criminal markets fast, hours or days. Hudson Rock watches these markets and indexes the data, offering a unique view of credential exposure.
Infostealer data surfaces exposed credentials, often months before security teams know. No other source provides this intel. The information helps teams identify and mitigate threats.
That's it.
Cavalier: The Free Lookup
Hudson Rock offers Caveat, a free search tool, no account needed. You can search by email address or corporate domain.
Caveat provides information on compromised credentials. If you search by email address and we have a match, you'll see the date the machine was compromised, the malware family, the URL where the credentials were stored, and part of the username.
Searching by corporate domain yields results on employee count with compromised machines and a summary of findings.
Caveat is useful for OSINT investigators doing due diligence on an organization. One search shows if their employee credentials have been harvested.
Practical Applications
Hudson Rock's data has several practical applications:
Corporate security assessment: Search your domain. Find compromised employee machines. Multiple hits? Act fast.
Third-party risk: Check a vendor's domain before onboarding. Infostealer exposure? That's a supply chain risk.
Incident response triage: Email addresses in a breach. Check Hudson Rock's database. Stolen creds or a vuln?
OSINT investigation of individuals: Email address in the database. That's intel. Compromise date, malware used, other machine contents.
Threat actor research: Hudson Rock publishes reports on active infostealer campaigns. Malware families, targeted orgs, market trends.
What the Data Doesn't Tell You
Presence in an infostealer database indicates that credentials were likely stolen. However, it does not confirm active use of those credentials, the extent of account access, or any subsequent security measures taken.
You need context. A compromised credential might be listed, but its actual use remains uncertain.
The type of data collected by infostealers varies. Some log keystrokes, while others take screenshots.
Your next step is to correlate this information with other threat intelligence to see if related IPs or domains appear, which can indicate current risk.
- The credentials are still valid
- The credentials were used by attackers
- The machine was aware of or reported the infection
Stealing session cookies lets an attacker bypass password resets and 2FA. That's a problem. Cookies stay valid until they expire or the user logs out, often that's days or weeks. You can't just change a password to lock someone out, the attacker still has a cookie.
Comparison to Alternatives
Hudson Rock's data fills gaps in breach intel from HaveIBeenPwned and DeHashed. Flare and SpyCloud offer similar data, with different pricing and coverage.
The free tier of Caveat works for solo investigators. For corporate teams, Hudson Rock Enterprise competes with others on coverage and price.
Reviewed April 2026. A free lookup is available at caveat.hudsonrock.com.
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This review reflects testing as of 2026-04-03. OSINT tools change frequently — check the vendor's current documentation for pricing and feature updates. Report an error →