Antidetect Browsers Fuel Stealth Phishing Fraud

Check Point Research
Last updated October 20, 2026

The report documents how criminals use antidetect browsers to make stolen sessions and phishing logins appear to come from legitimate, local devices. A commercially available Browser-in-the-Middle workflow can relay a victim’s login details to real services such as Google, Microsoft, Facebook, and financial platforms while avoiding common security checks.

Key findings

  • Attackers use antidetect browser profiles, residential proxies, CAPTCHA-solving, and identity-verification bypass tools to create verified accounts that can later be used for fraud.
  • A documented Browser-in-the-Middle phishing workflow uses a victim’s location-matched residential proxy and a clean device fingerprint to make a fraudulent login look legitimate to the targeted service.
  • Stolen session cookies, refresh tokens, and authentication flags can be inserted into browser profiles to take over an already authenticated account without generating a new login event.
  • AI-assisted content generation and account-management automation enable small groups to operate large networks of apparently independent social-media accounts.
  • The report identifies Kameleo, AdsPower, and MultiLogin as tools documented in criminal forums and marketplaces, despite their legitimate commercial uses.

Who’s being targeted

  • Affected industries: Financial services, Cryptocurrency exchanges, Banking, E-commerce, Social media platforms, Technology platforms.
  • Attack channels: website.
  • Impersonated: Google, Microsoft, Facebook, or a financial platform.

Red flags to watch for

  • The sign-in page was reached through an unexpected message or link.
  • The browser address or domain does not match the organization’s known sign-in page.
  • A login request appears unexpectedly and is not tied to an action the user initiated.
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Read the video transcript

A Google sign-in appears out of nowhere: “Sign in to continue.” Here’s the trick: Browser-in-the-Middle phishing relays what you type to the real Google login. An antidetect browser can make that login look like it came from your local device. That’s the surprise: Google may see a normal-looking login, even though you started on a fake page. Your clue is the address bar, not how convincing the sign-in looks. Unexpected sign-in? Skip that page. Open a new tab and type accounts.google.com yourself.

MITRE ATT&CK techniques

T1566 - PhishingT1056.003 - Input Capture: Web Portal CaptureT1550.004 - Use Alternate Authentication Material: Web Session CookieT1078 - Valid AccountsT1656 - Impersonation

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