Phishing-as-a-Service 'Sneaky 2FA' Kit Enables Browser-in-the-Browser Credential Theft

Threat actors are leveraging a Phishing-as-a-Service (PhaaS) kit called Sneaky 2FA to deploy advanced Browser-in-the-Browser (BitB) phishing attacks. This kit allows attackers to create highly convincing fake browser pop-up windows that closely mimic legitimate sign-in prompts, including a forged address bar displaying authentic-looking URLs. The technique is designed to deceive users into entering their credentials, which are then exfiltrated to the attacker. Security researchers have observed these attacks targeting Microsoft account credentials, with the kit's obfuscated code and anti-analysis features making detection and mitigation more challenging.

The Sneaky 2FA kit is available on criminal marketplaces, enabling even less-skilled threat actors to launch sophisticated phishing campaigns at scale. Attackers often use additional evasion tactics, such as bot protection checks (e.g., Cloudflare Turnstile) and CAPTCHAs, to filter out automated security tools before presenting the fake login window to real users. Experts recommend using password managers, which can help detect these fake forms by refusing to autofill credentials on non-legitimate login pages, as a key defense against such deceptive phishing techniques.