The Silent Threat You're Not Monitoring
Every day, millions of corporate credentials are harvested by a class of malware known as info-stealers. These lightweight programs run silently on infected devices, extracting saved passwords from browsers, email clients, and system keystores. The stolen data — typically formatted as URL, Login, Password (ULP) — is then packaged into what the cybersecurity community calls stealer logs.
These logs are sold in bulk on dark web marketplaces, Telegram channels, and underground forums. A single log file can contain thousands of credentials from hundreds of different websites and services.
How Info-Stealers Work
The infection chain is deceptively simple:
- Distribution — Malware is spread through phishing emails, cracked software, or malicious ads
- Execution — The stealer runs for seconds, extracting all saved passwords from the victim's browsers
- Exfiltration — Harvested credentials are sent to a command-and-control server
- Sale — The attacker packages logs and sells them on dark web markets
Popular info-stealer families like RedLine, Raccoon, and Vidar can extract credentials from Chrome, Firefox, Edge, and dozens of other applications. The entire process takes less than 30 seconds.
Why This Matters for Your Organization
The critical insight is this: your employees use their work email to sign up for services on their personal devices. When those personal devices get infected, your corporate credentials end up in stealer logs — even if your corporate network was never breached.
This means:
- VPN credentials for your corporate network could be circulating on the dark web
- Email passwords that grant access to sensitive communications are for sale
- SaaS platform logins (Slack, Jira, Salesforce) tied to your domain are exposed
- Admin panel credentials could give attackers direct access to your infrastructure
The Scale of the Problem
Our research shows that stealer log marketplaces process over 500 million new credentials per day. For a mid-sized company with 500 employees, the probability of at least one credential appearing in a stealer log within any 12-month period is over 87%.
What You Can Do
The first step is visibility. You can't protect against what you can't see.
- Monitor your domain — Use credential monitoring services to detect when passwords associated with your corporate email domain appear in stealer logs
- Enforce MFA everywhere — Multi-factor authentication makes stolen passwords significantly less useful
- Educate employees — Ensure staff understand the risks of saving corporate passwords in personal browsers
- Rotate exposed credentials immediately — When a leak is detected, force a password reset before attackers can use it
Start Now
The gap between credential theft and exploitation is shrinking. Attackers are moving faster, and the window to respond is measured in hours, not days.