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chore: fix license, add disclaimer, quick start, GitHub topics, issue templates
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mukul975
@@ -1,151 +1,112 @@
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#!/usr/bin/env python3
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"""Pass-the-Hash Detection Agent - Detects PTH via NTLM Event 4624 LogonType=3 analysis."""
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"""Pass-the-Hash attack detection agent.
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Detects NTLM hash reuse attacks by analyzing Windows Security Event ID 4624
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for Type 3 NTLM logons with anomalous patterns across multiple targets.
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"""
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import json
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import logging
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import argparse
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import json
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import re
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import sys
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from collections import defaultdict
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from datetime import datetime
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from Evtx.Evtx import FileHeader
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from lxml import etree
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try:
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import Evtx.Evtx as evtx
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except ImportError:
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evtx = None
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logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
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logger = logging.getLogger(__name__)
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NS = {"evt": "http://schemas.microsoft.com/win/2004/08/events/event"}
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LEGITIMATE_SOURCES = {"127.0.0.1", "::1", "-", ""}
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def parse_ntlm_logons(evtx_path):
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"""Parse Event 4624 NTLM network logons from Security EVTX."""
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ntlm_logons = []
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with open(evtx_path, "rb") as f:
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fh = FileHeader(f)
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for record in fh.records():
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try:
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xml = record.xml()
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root = etree.fromstring(xml.encode("utf-8"))
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eid = root.find(".//evt:System/evt:EventID", NS)
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if eid is None or eid.text != "4624":
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continue
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data = {}
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for elem in root.findall(".//evt:EventData/evt:Data", NS):
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data[elem.get("Name", "")] = elem.text or ""
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if data.get("LogonType") == "3" and data.get("AuthenticationPackageName") == "NTLM":
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time_elem = root.find(".//evt:System/evt:TimeCreated", NS)
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ntlm_logons.append({
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"timestamp": time_elem.get("SystemTime", "") if time_elem is not None else "",
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"account": data.get("TargetUserName", ""),
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"domain": data.get("TargetDomainName", ""),
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"source_ip": data.get("IpAddress", ""),
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"workstation": data.get("WorkstationName", ""),
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"logon_process": data.get("LogonProcessName", ""),
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"lm_package": data.get("LmPackageName", ""),
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"key_length": data.get("KeyLength", ""),
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})
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except Exception:
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def parse_logon_events(filepath):
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if evtx is None:
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return {"error": "python-evtx not installed: pip install python-evtx"}
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events = []
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with evtx.Evtx(filepath) as log:
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for record in log.records():
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xml = record.xml()
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if "<EventID>4624</EventID>" not in xml:
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continue
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logger.info("Parsed %d NTLM network logon events", len(ntlm_logons))
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return ntlm_logons
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logon_type = re.search(r'<Data Name="LogonType">(\d+)', xml)
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auth_pkg = re.search(r'<Data Name="AuthenticationPackageName">([^<]+)', xml)
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account = re.search(r'<Data Name="TargetUserName">([^<]+)', xml)
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domain = re.search(r'<Data Name="TargetDomainName">([^<]+)', xml)
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src_ip = re.search(r'<Data Name="IpAddress">([^<]+)', xml)
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computer = re.search(r'<Data Name="Computer">([^<]+)', xml)
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time_match = re.search(r'SystemTime="([^"]+)"', xml)
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lt = logon_type.group(1) if logon_type else ""
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ap = auth_pkg.group(1) if auth_pkg else ""
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if lt == "3" and "NTLM" in ap.upper():
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events.append({
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"timestamp": time_match.group(1) if time_match else "",
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"logon_type": int(lt), "auth_package": ap.strip(),
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"account": account.group(1) if account else "",
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"domain": domain.group(1) if domain else "",
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"source_ip": src_ip.group(1) if src_ip else "",
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"computer": computer.group(1) if computer else "",
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})
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return events
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def detect_pth_indicators(ntlm_logons):
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"""Detect Pass-the-Hash indicators in NTLM logon events."""
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pth_candidates = []
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for logon in ntlm_logons:
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indicators = []
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if logon["logon_process"].strip() == "NtLmSsp":
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indicators.append("NtLmSsp logon process")
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if logon["lm_package"].strip() == "NTLM V1":
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indicators.append("NTLMv1 (weaker, often PTH)")
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if logon["key_length"] == "0":
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indicators.append("Zero key length (PTH indicator)")
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if logon["workstation"] and logon["source_ip"]:
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indicators.append("Remote NTLM with workstation name")
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if indicators:
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logon["pth_indicators"] = indicators
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logon["confidence"] = min(len(indicators) * 25, 100)
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pth_candidates.append(logon)
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logger.info("Found %d PTH candidate events", len(pth_candidates))
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return pth_candidates
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def detect_pth_patterns(events, target_threshold=3):
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if isinstance(events, dict) and "error" in events:
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return [events]
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findings = []
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src_targets = defaultdict(lambda: {"computers": set(), "count": 0,
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"source_ip": "", "account": ""})
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for evt in events:
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src = evt.get("source_ip", "")
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if src in LEGITIMATE_SOURCES:
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continue
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key = f"{src}|{evt.get('account', '')}"
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src_targets[key]["computers"].add(evt.get("computer", ""))
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src_targets[key]["count"] += 1
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src_targets[key]["source_ip"] = src
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src_targets[key]["account"] = evt.get("account", "")
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def detect_lateral_movement_chains(ntlm_logons):
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"""Detect chains of NTLM logons from the same account across multiple hosts."""
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account_hosts = defaultdict(set)
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account_events = defaultdict(list)
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for logon in ntlm_logons:
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account = f"{logon['domain']}\\{logon['account']}"
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if not logon["account"].endswith("$"):
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account_hosts[account].add(logon["source_ip"])
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account_events[account].append(logon)
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chains = []
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for account, hosts in account_hosts.items():
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if len(hosts) >= 3:
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chains.append({
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"account": account,
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"unique_source_ips": len(hosts),
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"total_logons": len(account_events[account]),
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"source_ips": list(hosts),
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"indicator": "Multi-host NTLM lateral movement",
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"severity": "critical" if len(hosts) >= 5 else "high",
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for key, data in src_targets.items():
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target_count = len(data["computers"])
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if target_count >= target_threshold:
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findings.append({
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"type": "ntlm_type3_multi_target",
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"source_ip": data["source_ip"],
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"account": data["account"],
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"target_count": target_count,
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"targets": list(data["computers"])[:20],
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"total_logons": data["count"],
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"severity": "CRITICAL" if target_count >= 10 else "HIGH",
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"mitre": "T1550.002",
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})
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logger.info("Found %d lateral movement chains", len(chains))
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return chains
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def detect_workstation_mismatch(ntlm_logons):
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"""Detect mismatches between source workstation and expected host."""
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account_workstations = defaultdict(set)
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for logon in ntlm_logons:
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if logon["account"] and not logon["account"].endswith("$"):
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key = f"{logon['domain']}\\{logon['account']}"
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account_workstations[key].add(logon["workstation"])
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mismatches = []
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for account, workstations in account_workstations.items():
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if len(workstations) >= 3:
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mismatches.append({
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"account": account,
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"unique_workstations": len(workstations),
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"workstations": list(workstations),
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"indicator": "Account used from multiple workstations (PTH spread)",
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admin_sources = defaultdict(int)
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for evt in events:
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if evt.get("account", "").lower() in ("administrator", "admin"):
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admin_sources[evt.get("source_ip", "")] += 1
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for src, count in admin_sources.items():
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if count >= 2 and src not in LEGITIMATE_SOURCES:
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findings.append({
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"type": "admin_ntlm", "source_ip": src,
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"logon_count": count, "severity": "HIGH", "mitre": "T1550.002",
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})
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return mismatches
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def generate_report(ntlm_logons, pth_candidates, chains, mismatches):
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"""Generate Pass-the-Hash detection report."""
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report = {
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"timestamp": datetime.utcnow().isoformat(),
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"total_ntlm_logons": len(ntlm_logons),
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"pth_candidates": len(pth_candidates),
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"lateral_movement_chains": len(chains),
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"workstation_mismatches": len(mismatches),
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"high_confidence_pth": [p for p in pth_candidates if p.get("confidence", 0) >= 75],
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"chain_details": chains,
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"mismatch_details": mismatches,
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"sample_pth_events": pth_candidates[:20],
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}
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total = len(pth_candidates) + len(chains)
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print(f"PTH DETECTION: {len(pth_candidates)} candidates, {len(chains)} lateral chains")
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return report
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return findings
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def main():
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parser = argparse.ArgumentParser(description="Pass-the-Hash Detection Agent")
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parser.add_argument("--evtx-file", required=True, help="Path to Security EVTX file")
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parser.add_argument("--output", default="pth_report.json")
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parser = argparse.ArgumentParser(description="Pass-the-Hash Detector")
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parser.add_argument("--security-log", required=True, help="Windows Security EVTX")
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parser.add_argument("--target-threshold", type=int, default=3)
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args = parser.parse_args()
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ntlm_logons = parse_ntlm_logons(args.evtx_file)
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pth_candidates = detect_pth_indicators(ntlm_logons)
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chains = detect_lateral_movement_chains(ntlm_logons)
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mismatches = detect_workstation_mismatch(ntlm_logons)
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report = generate_report(ntlm_logons, pth_candidates, chains, mismatches)
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with open(args.output, "w") as f:
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json.dump(report, f, indent=2)
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logger.info("Report saved to %s", args.output)
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events = parse_logon_events(args.security_log)
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findings = detect_pth_patterns(events, args.target_threshold)
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ntlm_count = len(events) if isinstance(events, list) else 0
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results = {
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"timestamp": datetime.utcnow().isoformat() + "Z",
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"total_ntlm_type3_logons": ntlm_count,
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"findings": findings, "total_findings": len(findings),
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}
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print(json.dumps(results, indent=2))
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if __name__ == "__main__":
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