Proxies for Threat Hunting

How to Use Proxies for Threat Hunting

Threat hunting involves proactively searching for malicious activity, investigating suspicious infrastructure, and collecting threat intelligence. Proxy infrastructure provides the anonymity and source diversification that security researchers need to investigate threats without exposing their identity or organizational infrastructure.

Why Threat Hunters Need Proxies

1. Anonymity: Do not reveal your organization's IP to threat actors
2. Isolation: Keep threat research traffic separate from corporate network
3. Geographic access: Investigate geo-targeted attacks from the affected regions
4. Source diversity: Query threat intelligence sources from multiple IPs

Safe Investigation Architecture

import httpx
import time
import random
from dataclasses import dataclass
from datetime import datetime

@dataclass(frozen=True)
class ThreatIndicator:
    ioc_type: str  # domain, ip, hash, url
    value: str
    risk_level: str
    context: str
    source: str
    investigated_at: str

class ThreatInvestigator:
    def __init__(self, username: str, password: str):
        self._username = username
        self._password = password

    def _get_anonymous_proxy(self, country: str = "") -> str:
        """Get a unique anonymous proxy session for investigation."""
        session_id = f"threat-{int(time.time())}-{random.randint(10000, 99999)}"
        user = self._username
        if country:
            user = f"{user}-country-{country}"
        user = f"{user}-session-{session_id}"
        return f"http://{user}:{self._password}@gate.hexproxies.com:8080"

    def investigate_domain(self, domain: str) -> list[ThreatIndicator]:
        """Safely investigate a suspicious domain."""
        findings: list[ThreatIndicator] = []
        proxy = self._get_anonymous_proxy()

        # DNS resolution check
        try:
            with httpx.Client(proxy=proxy, timeout=10) as client:
                resp = client.get(f"https://dns.google/resolve?name={domain}&type=A")
                if resp.status_code == 200:
                    findings = [*findings, ThreatIndicator(
                        ioc_type="domain",
                        value=domain,
                        risk_level="under_investigation",
                        context=f"DNS: {resp.text[:200]}",
                        source="dns_lookup",
                        investigated_at=datetime.utcnow().isoformat(),
                    )]
        except Exception:
            pass

        time.sleep(random.uniform(2.0, 5.0))

        # HTTP response analysis (be careful — do NOT execute JavaScript)
        try:
            with httpx.Client(proxy=self._get_anonymous_proxy(), timeout=10, follow_redirects=False) as client:
                resp = client.get(
                    f"https://{domain}",
                    headers={"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36"},
                )
                findings = [*findings, ThreatIndicator(
                    ioc_type="url",
                    value=f"https://{domain}",
                    risk_level="under_investigation",
                    context=f"HTTP {resp.status_code}, headers: {dict(resp.headers)}",
                    source="http_probe",
                    investigated_at=datetime.utcnow().isoformat(),
                )]
        except Exception as e:
            findings = [*findings, ThreatIndicator(
                ioc_type="url",
                value=f"https://{domain}",
                risk_level="under_investigation",
                context=f"Error: {str(e)}",
                source="http_probe",
                investigated_at=datetime.utcnow().isoformat(),
            )]

        return findings

Phishing Site Investigation

def investigate_phishing_url(
    url: str,
    investigator: ThreatInvestigator,
    countries: list[str],
) -> dict[str, ThreatIndicator]:
    """Investigate a suspected phishing URL from multiple regions."""
    results: dict[str, ThreatIndicator] = {}

    for country in countries:
        proxy = investigator._get_anonymous_proxy(country)
        time.sleep(random.uniform(3.0, 7.0))

        try:
            with httpx.Client(proxy=proxy, timeout=10, follow_redirects=False) as client:
                resp = client.get(url, headers={
                    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
                })
                results = {**results, country: ThreatIndicator(
                    ioc_type="url",
                    value=url,
                    risk_level="suspicious",
                    context=f"From {country}: HTTP {resp.status_code}, Location: {resp.headers.get('location', 'none')}",
                    source="phishing_investigation",
                    investigated_at=datetime.utcnow().isoformat(),
                )}
        except Exception as e:
            results = {**results, country: ThreatIndicator(
                ioc_type="url",
                value=url,
                risk_level="suspicious",
                context=f"From {country}: Error {str(e)}",
                source="phishing_investigation",
                investigated_at=datetime.utcnow().isoformat(),
            )}

    return results

Threat Intelligence Feed Collection

THREAT_FEEDS = [
    {"name": "abuse_ch", "url": "https://urlhaus.abuse.ch/api/", "type": "malware_urls"},
    {"name": "phishtank", "url": "https://data.phishtank.com/data/online-valid.json", "type": "phishing"},
]

def collect_threat_feeds(proxy: str) -> dict[str, dict]:
    """Collect threat intelligence from public feeds."""
    results: dict[str, dict] = {}
    for feed in THREAT_FEEDS:
        time.sleep(random.uniform(2.0, 5.0))
        try:
            with httpx.Client(proxy=proxy, timeout=30) as client:
                resp = client.get(feed["url"], headers={"Accept": "application/json"})
                results = {**results, feed["name"]: {
                    "status": resp.status_code,
                    "type": feed["type"],
                    "size": len(resp.content),
                }}
        except Exception:
            continue
    return results

Operational Security for Threat Research

1. Use dedicated research proxies — never mix with corporate traffic
2. Rotate sessions per investigation — prevent correlation between investigations
3. Never execute JavaScript from suspicious sites — use headless HTTP clients only
4. Run research in isolated environments — VMs or containers with no corporate network access
5. Document all investigations — maintain audit trails for legal protection

Safety Warnings

• Never access content that is illegal to view in your jurisdiction
• Use sandboxed environments for analyzing malicious content
• Do not interact with threat actors
• Report findings to appropriate authorities when required
• Follow your organization's incident response procedures

Hex Proxies residential network covering 195+ countries provides the anonymity and geographic diversity that threat hunting operations require. Every investigation gets a unique, untraceable session.