PHANTOMPRINT

Passive Hybrid ANalysis Tool for Os-agnostic Multiprotocol PRofiling & INTelligence

Fingerprint hosts on your network without sending a single packet.

PHANTOMPRINT correlates multiple passive signals (TCP/IP stack, TLS/JA4, DHCP Option 55, HTTP/2 HPACK, DNS behavior) to identify operating systems, browsers, and devices from observed traffic alone.

Why PHANTOMPRINT?

Tool	TCP/IP FP	TLS JA4	DHCP FP	Multi-signal	Confidence Score
p0f	✅	❌	❌	❌	❌
Zeek	✅	plugin	❌	❌	❌
JA3er	❌	✅	❌	❌	❌
PHANTOMPRINT	✅	✅	✅	✅	✅

p0f hasn't been maintained since 2014. Zeek requires heavy infrastructure. Nothing correlates all these signals into a unified, scored host profile.

How It Works

Network Traffic
      │
      ├─── TCP SYN/SYN-ACK ──→ TCPIPParser  ──→ TTL + Window + Options hash
      ├─── TLS ClientHello  ──→ TLSParser    ──→ JA4 fingerprint
      ├─── DHCP DISCOVER    ──→ DHCPParser   ──→ Option 55 fingerprint
      └─── (HTTP/2, DNS)    ──→ [coming v1.5]
                                      │
                                 SignalMerger
                                      │
                            Bayesian Score Engine
                                      │
                               HostProfile
                          ┌──────────┴──────────┐
                       Terminal              JSON / STIX

No packets are sent. No connections are opened. Fully passive.

Installation

git clone https://github.com/youruser/phantomprint
cd phantomprint
pip install -e ".[dev]"

Requires Python 3.11+ and root/CAP_NET_RAW for live capture.

Usage

Live capture

sudo phantomprint live -i eth0
sudo phantomprint live -i eth0 -t 60 -o results.json
sudo phantomprint live -i eth0 --verbose

Analyze a PCAP file (no root needed)

phantomprint pcap capture.pcap
phantomprint pcap capture.pcap -o results.json

List loaded signatures

phantomprint signatures
phantomprint signatures --category os
phantomprint signatures --category browser

Example Output

◈ PHANTOMPRINT v0.1.0 — Results (4 hosts)

┌─────────────────┬──────────────────┬───────────────┬──────────────────────┬───────┐
│ Host / MAC      │ OS               │ Browser / App │ Signals              │ Score │
├─────────────────┼──────────────────┼───────────────┼──────────────────────┼───────┤
│ 192.168.1.45    │ Windows 11       │ Chrome 120    │ TCP TLS DHCP         │  78%  │
│ 192.168.1.12    │ Linux 6.x        │ curl          │ TCP TLS              │  52%  │
│ 192.168.1.1     │ Cisco IOS Router │ —             │ TCP                  │  18%  │
│ aa:bb:cc:dd:... │ Android 12-14    │ —             │ DHCP                 │  31%  │
└─────────────────┴──────────────────┴───────────────┴──────────────────────┴───────┘

Signature Format

Signatures live in signatures/raw/ as YAML files:

# signatures/raw/os/windows11.yaml
id: os_win11
name: Windows 11
type: os
description: Windows 11 / Windows Server 2022
signals:
  tcp_ip:
    - "128:65535:1:mss,nop,wscale,sackok,timestamp"
    - "128:64240:1:mss,nop,wscale,sackok,timestamp"
  dhcp:
    - "1,3,6,15,31,33,43,44,46,47,119,121,249,252"

Add your own signatures and they're loaded automatically.

Use Cases

Red Team: Silent OS/browser reconnaissance before exploitation — zero IDS alerts
Pentesting: Map network assets passively during initial access phase
SOC / Threat Hunting: Detect rogue devices or fingerprint changes (VM migration, evasion)
Bug Bounty: Passive infrastructure recon without generating target-side logs
Forensics: Reconstruct which OS/browsers were active from historical PCAPs
Threat Intelligence: Track actors rotating infrastructure via composite hash

Roadmap

v1.0  ─ TCP/IP + TLS/JA4 + DHCP parsers (current)
v1.5  ─ HTTP/2 HPACK fingerprinting, DNS behavior analysis, Rust capture engine
v2.0  ─ Cross-sensor correlation (Redis), behavioral drift detection, STIX 2.1 output
v2.5  ─ Zeek plugin, Elastic/Splunk output, web UI

Legal & Ethics

PHANTOMPRINT is designed for use on networks you own or have explicit authorization to monitor. Passive fingerprinting falls under MITRE ATT&CK T1040 (Network Sniffing) — ensure you have appropriate authorization before deployment.

Licensed under GPL-3.0.

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