Vitalii Zaiats
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Vitalii Zaiats

Security engineer

I pull apart malware, residential-proxy networks, and the automated traffic that rides through them — and hand what I find to whoever can act on it.
About CV

Projects

  • tls-reputation

    Open-source reputation database for TLS client fingerprints — look up a JA3/JA4 and see which domains it reaches, and how widely it spreads.

  • wasm-probe

    Live demo that detects spoofed CPU architecture from inside the browser via WebAssembly.

Pinned

  • 17 million devices for rent: tracing a residential-proxy botnet from one cracked game Jun 26

2026

  • Paying off the debt: I finally opened one of those hidden APK payloads, and it wasn't proxyware Jul 28
  • Eleven proxy networks and a country code: how a torrent client decides who rents your connection Jul 25
  • A browser can fake its WebRTC address — it can't fake the packet Jul 22
  • A TLS fingerprint won't tell you it's a bot — what it reaches for will Jul 19
  • Wire-to-WiFi correlation, part two Jul 16
  • The extra hop: counting a visitor's NAT layers from the outside Jul 15
  • Wire-to-WiFi correlation Jul 4
  • Chaining SOCKS5 UDP relays: self-loops, SSRF, and the amplification that isn't Jun 13
  • Auth on TCP, open on UDP: the SOCKS5 relays scanners can't see Jun 11
  • From a proxy pool's torrents to a booby-trapped game May 31
  • Coordinated disclosure: CCTV cameras selling their owners' bandwidth Apr 15
  • The iOS proxy ghost: why you can't find an iPhone in a residential pool Apr 3
  • TCP-fingerprinting 300K residential proxy IPs: 98% are Linux Mar 26
  • Detecting credential stuffing through encrypted traffic Mar 24
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