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Documentation & Research Whitepapers

Collection of key technical papers, published research articles and reference manuals to understand the profound architecture of network analysis.

The Art of Port Scanning

by Fyodor & Ghosstless Core Security Group - Phrack Magazine # 51

The seminal article that revolutionized network audit. It describes theoretical and practical methods to identify open, closed or leaked ports using the strict anomalies and requirements of TCP RFC 793.

# Sondeo sigiloso SYN sin completar el handshake:
Host A ------ SYN -----> Host B (Puerto 80)
Host A <-- SYN/ACK ---- Host B (¡Puerto Abierto!)
Host A ------ RST -----> Host B (Cierre inmediato y sigiloso)

Remote OS Detection via TCP/IP Stack Fingerprinting

Posted at DEFCON & Ghosstless Docs Conferences

Math and low level explanation of how different operating systems (Linux, Windows, FreeBSD, Cisco IOS, Apple Darwin) implement subtle variations in initial sequence number generation (NSI), TCP options (MSS, Window Scale, SACK, Timestamp) and TTL calculation.

Ghosstless sends a 9-pack flash especially designed to capture the remote system's "fingerprint" and to compare it with a database with more than 6,000 known fingerprints.

TCP Idle Scan: The Ultimate Stealth Scan (-sI)

Analysis of lateral channel attacks on IP ID counter

A technique that allows scanning a target without sending a single package directly from your actual IP address. It uses an intermediary host ("zombie") with a predictable IP ID counter to infer remote port status with complete anonymity.

$ ghosstless -sI zombie-host.example.com 192.168.1.1

GSE Scripting Engine Architecture & API Manual

Development guide for Lua 5.3 with asynchronous sockets

Manual for development of offensive and defensive scripts. Contains detailed references of native libraries nmap.socket, dns, http, vulns y tls to automate complex penetration tests.

-- Ejemplo de script de auditoría GSE en Lua:
local http = require "http"
local shortport = require "shortport"
portrule = shortport.http
action = function(host, port)
  local resp = http.get(host, port, "/")
  return "Server banner: " .. resp.header["server"]
end

When IDS / IPS perimeter systems block regular probes, Ghosstless offers raw and camouflage packet fragmentation techniques by signage: