Stolen Data Monitoring Your staff and customer logins are being harvested by malware.
Infostealer malware silently steals saved passwords, session cookies and autofill data from infected devices. DarkStrata finds your organisation's accounts in these stealer logs before attackers use them.
- Captured
- 12 Sept 2026
- Stealer family
- Lumma
- Infected host
- DESKTOP-•••• · Windows 11
- URL
- https://login.example.co.uk
- Username
- j.s•••@example.co.uk
- Password
- ••••••••••••
- Session cookies
- 14 for this siteEnough to resume a signed-in session without the password or MFA.
What's inside a stealer log
A stealer log is everything the malware copied from one infected device: saved passwords, session cookies and autofill data. It also shows which services your staff use – a ready-made blueprint for targeted phishing.
Session cookies are the dangerous part. They let an attacker resume a logged-in session and bypass multi-factor authentication entirely – no brute force, no exploit, no MFA prompt.
Two kinds of stolen account
Staff accounts
Attackers simply log in as your employees, using keys they already hold. One compromised supplier can spread the risk across your whole partner network.
Customer accounts
Stolen customer logins lead to account takeover. Hijacked logins, chargebacks and lost trust all hit your bottom line directly.
20+ infostealer families, parsed automatically
We parse each family's log format automatically, including previously unseen variants, so coverage keeps pace as new malware-as-a-service stealers appear.
- RedLine
- Lumma
- Vidar
- Raccoon
- StealC
- Mystic
- Titan
- RisePro
Logs are traded on underground forums, marketplaces and Telegram channels. Where we find them
Don't just monitor. Detect, notify and remediate.
Most tools stop at an alert for your IT team. DarkStrata carries on until the exposure is fixed.
How Lens notifies employees privatelyDetect
We watch infostealer logs, breach dumps, criminal forums and Telegram for every address at your domains, and alert you within seconds of a match.
Notify privately
The affected employee is told directly and shown what to do. Admins never see their passwords.
Remediate
Clear next steps for each exposed account, built-in training tracked to completion, and alerts sent to your ticketing or SIEM if you use one.
Stolen data monitoring: frequently asked questions
How stealer-log monitoring works, and what it means for your staff.
What is stolen credential and stealer-log monitoring?
It is the continuous monitoring of infostealer logs, dark-web marketplaces, Telegram channels and breach data. We look for your organisation's exposed credentials, session cookies and tokens. When a match surfaces, you are alerted – so you can revoke access before an attacker uses it. DarkStrata focuses on fresh stealer-log data, where account-takeover risk is highest.
How quickly will I be alerted if a credential is exposed?
A stolen credential typically appears on a criminal marketplace within 24 to 48 hours of being taken. DarkStrata is built to surface exposures inside that window. You can act before the credential is used, rather than learning about it weeks later.
Do you detect stolen session cookies, not just passwords?
Yes. Stolen session cookies let an attacker resume a logged-in session and bypass multi-factor authentication entirely. Detecting them matters as much as detecting passwords. DarkStrata flags leaked session cookies and tokens found in stealer logs – not only username-and-password pairs.
Will security staff see employees' actual passwords?
No. DarkStrata notifies affected employees privately and lets them fix their own exposures. Administrators never see the plaintext password. This closes the loop faster, and it avoids creating a second copy of the secret inside your organisation.
Which sources do you monitor for exposed credentials?
We cover fresh infostealer logs from the major malware families, including RedLine, Lumma, StealC, Vidar and Raccoon. We also monitor underground marketplaces, Telegram channels that share logs, hacker forums and breach datasets. Broad coverage reduces the chance of a blind spot on the channel where your data appears.
Can I integrate exposure alerts with my own tools and AI agents?
Yes. DarkStrata provides a documented REST API, webhooks for push alerts, and SIEM-ready STIX output. A native MCP server lets AI agents and SOAR playbooks query exposures and trigger fixes automatically – no human copying findings out of a dashboard.
How is this different from a 'have I been breached' lookup?
A one-off breach lookup tells you about historic, already-public dumps. Stealer-log monitoring is continuous. It focuses on fresh, malware-stolen data that is often not yet public – the exposures most likely to be used next. It is the difference between reading history and getting early warning.
Related reading
- Breach responseOur step-by-step UK Data Breach Response guide, including the ICO 72-hour rule.
- SIEM integrationExport alerts as STIX 2.1, CEF and LEEF to Splunk, QRadar, Sentinel, ArcSight and more.
- Red teamsThe same credential and session data real attackers use, for penetration testers.
- Verification botSeen our bot in your logs? It confirms ownership when you add a domain to monitor.
Find out what's already out there
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