Starkiller Phishing Kit: Why MFA Fails Against Real-Time Reverse Proxies — Technical Analysis + Rust PoC for TLS Fingerprinting
phishingcybersecurityMFAmulti-factor-authenticationAitMadversary-in-the-middleTLS-fingerprintingStarkillerPhaaSphishing-as-a-servicereverse-proxyRustja3-probesecurity-toolsthreat-detection
The post discusses the Starkiller phishing kit, a Phishing-as-a-Service (PhaaS) platform that proxies real login pages instead of cloning them. The author provides a technical breakdown of the Adversary-in-the-Middle (AitM) attack flow and explains why traditional defenses, including Multi-Factor Authentication (MFA), are ineffective against it. Additionally, the post outlines detection strategies, such as TLS fingerprinting, and introduces ja3-probe, a Rust-based proof-of-concept tool that parses TLS ClientHello messages to classify clients.