Nmap Advanced Techniques — NSE Scripts, OS Detection & Firewall Evasion

Nmap Advanced Techniques

Most people only use nmap target. But Nmap's real power lies in its 600+ NSE scripts and advanced scanning engine.

NSE (Nmap Scripting Engine)

# Run all vulnerability scripts
nmap --script vuln target

# HTTP enumeration
nmap --script http-enum target

# Brute force SSH
nmap --script ssh-brute --script-args userdb=users.txt,passdb=pass.txt target

# Check for specific CVE
nmap --script smb-vuln-ms17-010 target   # EternalBlue check

OS Fingerprinting

nmap -O target                  # Basic OS detection
nmap -O --osscan-guess target   # Aggressive guessing
nmap -A target                  # OS + version + scripts + traceroute

IDS/Firewall Evasion

# Decoy scan — hide among fake IPs
nmap -D RND:10 target

# Fragment packets
nmap -f target

# Custom MTU
nmap --mtu 24 target

# Spoof source port
nmap --source-port 53 target    # Look like DNS traffic

# Timing control
nmap -T0 target                 # Paranoid — 1 probe per 5 minutes
nmap -T1 target                 # Sneaky — 15 second intervals

Output Formats

nmap -oN scan.txt target        # Normal output
nmap -oX scan.xml target        # XML (for tools)
nmap -oG scan.gnmap target      # Grepable
nmap -oA scan target            # All formats at once

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