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chore: fix license, add disclaimer, quick start, GitHub topics, issue templates
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mukul975
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#!/usr/bin/env python3
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"""Detect process injection techniques (T1055) via Sysmon Event IDs 8 and 10."""
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import json
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import argparse
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from datetime import datetime
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from collections import defaultdict
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LEGITIMATE_INJECTION_PAIRS = {
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("csrss.exe", "svchost.exe"), ("lsass.exe", "svchost.exe"),
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("services.exe", "svchost.exe"), ("smss.exe", "csrss.exe"),
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("wininit.exe", "services.exe"), ("svchost.exe", "runtimebroker.exe"),
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("msmpeng.exe", "svchost.exe"), # Windows Defender
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("mbamservice.exe", "svchost.exe"), # Malwarebytes
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("avp.exe", "svchost.exe"), # Kaspersky
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}
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SUSPICIOUS_SOURCE_PROCESSES = {
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"powershell.exe", "powershell_ise.exe", "pwsh.exe", "cmd.exe",
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"wscript.exe", "cscript.exe", "mshta.exe", "rundll32.exe",
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"regsvr32.exe", "msbuild.exe", "installutil.exe",
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"winword.exe", "excel.exe", "powerpnt.exe",
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}
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HIGH_VALUE_TARGETS = {
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"lsass.exe", "svchost.exe", "explorer.exe", "winlogon.exe",
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"csrss.exe", "services.exe", "spoolsv.exe", "taskhost.exe",
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"dllhost.exe", "wininit.exe",
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}
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DANGEROUS_ACCESS_RIGHTS = {
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"0x1F0FFF": "PROCESS_ALL_ACCESS",
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"0x001F0FFF": "PROCESS_ALL_ACCESS",
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"0x1FFFFF": "PROCESS_ALL_ACCESS",
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"0x0040": "PROCESS_DUP_HANDLE",
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"0x0020": "PROCESS_VM_WRITE",
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"0x0008": "PROCESS_VM_OPERATION",
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"0x0002": "PROCESS_CREATE_THREAD",
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"0x001A": "PROCESS_VM_WRITE|PROCESS_VM_OPERATION|PROCESS_CREATE_THREAD",
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"0x143A": "CLASSIC_INJECTION_RIGHTS",
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}
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INJECTION_SUBTECHNIQUES = {
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"CreateRemoteThread": {"id": "T1055.001", "name": "DLL Injection"},
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"NtWriteVirtualMemory": {"id": "T1055.001", "name": "DLL Injection"},
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"QueueUserAPC": {"id": "T1055.004", "name": "APC Injection"},
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"NtMapViewOfSection": {"id": "T1055.012", "name": "Process Hollowing"},
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"SetWindowsHookEx": {"id": "T1055.001", "name": "DLL Injection via Hook"},
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}
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def parse_sysmon_events(log_path):
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"""Parse Sysmon JSON events, focusing on Event IDs 1, 8, and 10."""
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events = {"process_create": [], "create_remote_thread": [], "process_access": []}
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with open(log_path) as f:
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for line in f:
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line = line.strip()
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if not line:
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continue
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try:
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event = json.loads(line)
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except json.JSONDecodeError:
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continue
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event_id = event.get("EventID", event.get("event_id", 0))
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if event_id == 1:
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events["process_create"].append(event)
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elif event_id == 8:
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events["create_remote_thread"].append(event)
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elif event_id == 10:
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events["process_access"].append(event)
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return events
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def detect_remote_thread_injection(events):
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"""Detect suspicious CreateRemoteThread (Sysmon Event ID 8)."""
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detections = []
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for event in events:
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source_image = event.get("SourceImage", "").lower()
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target_image = event.get("TargetImage", "").lower()
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source_name = source_image.rsplit("\\", 1)[-1] if "\\" in source_image else source_image
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target_name = target_image.rsplit("\\", 1)[-1] if "\\" in target_image else target_image
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if (source_name, target_name) in LEGITIMATE_INJECTION_PAIRS:
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continue
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severity = "medium"
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if source_name in SUSPICIOUS_SOURCE_PROCESSES:
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severity = "high"
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if target_name in HIGH_VALUE_TARGETS:
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severity = "critical" if severity == "high" else "high"
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start_function = event.get("StartFunction", "")
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start_module = event.get("StartModule", "")
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subtechnique = INJECTION_SUBTECHNIQUES.get("CreateRemoteThread", {})
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detections.append({
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"event_id": 8,
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"timestamp": event.get("UtcTime", event.get("TimeCreated", "")),
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"source_image": event.get("SourceImage", ""),
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"target_image": event.get("TargetImage", ""),
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"start_function": start_function,
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"start_module": start_module,
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"source_pid": event.get("SourceProcessId", ""),
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"target_pid": event.get("TargetProcessId", ""),
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"new_thread_id": event.get("NewThreadId", ""),
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"user": event.get("User", "unknown"),
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"severity": severity,
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"mitre_technique": subtechnique.get("id", "T1055"),
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"mitre_name": subtechnique.get("name", "Process Injection"),
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"indicator": f"CreateRemoteThread: {source_name} -> {target_name}",
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})
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return detections
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def detect_suspicious_process_access(events):
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"""Detect suspicious ProcessAccess (Sysmon Event ID 10)."""
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detections = []
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for event in events:
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source_image = event.get("SourceImage", "").lower()
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target_image = event.get("TargetImage", "").lower()
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source_name = source_image.rsplit("\\", 1)[-1] if "\\" in source_image else source_image
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target_name = target_image.rsplit("\\", 1)[-1] if "\\" in target_image else target_image
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granted_access = event.get("GrantedAccess", "").lower()
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if (source_name, target_name) in LEGITIMATE_INJECTION_PAIRS:
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continue
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access_label = DANGEROUS_ACCESS_RIGHTS.get(granted_access, "")
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if not access_label and granted_access not in {"0x1f0fff", "0x001a", "0x143a", "0x0020"}:
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continue
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severity = "medium"
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if source_name in SUSPICIOUS_SOURCE_PROCESSES:
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severity = "high"
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if target_name == "lsass.exe":
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severity = "critical"
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if "ALL_ACCESS" in access_label:
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severity = "critical"
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detections.append({
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"event_id": 10,
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"timestamp": event.get("UtcTime", event.get("TimeCreated", "")),
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"source_image": event.get("SourceImage", ""),
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"target_image": event.get("TargetImage", ""),
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"granted_access": granted_access,
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"access_label": access_label,
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"source_pid": event.get("SourceProcessId", ""),
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"target_pid": event.get("TargetProcessId", ""),
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"user": event.get("User", "unknown"),
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"severity": severity,
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"mitre_technique": "T1055",
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"indicator": f"Suspicious process access: {source_name} -> {target_name} ({access_label})",
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})
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return detections
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def build_injection_graph(thread_detections, access_detections):
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"""Build a source->target injection relationship graph."""
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graph = defaultdict(lambda: {"targets": set(), "event_count": 0})
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for d in thread_detections + access_detections:
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src = d["source_image"].rsplit("\\", 1)[-1] if "\\" in d["source_image"] else d["source_image"]
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tgt = d["target_image"].rsplit("\\", 1)[-1] if "\\" in d["target_image"] else d["target_image"]
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graph[src]["targets"].add(tgt)
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graph[src]["event_count"] += 1
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return {src: {"targets": list(info["targets"]), "event_count": info["event_count"]}
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for src, info in graph.items()}
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def generate_report(events, thread_detections, access_detections, injection_graph, log_path):
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"""Generate process injection hunt report."""
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all_detections = thread_detections + access_detections
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severity_counts = defaultdict(int)
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for d in all_detections:
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severity_counts[d["severity"]] += 1
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return {
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"report_time": datetime.utcnow().isoformat(),
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"log_source": log_path,
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"events_parsed": {
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"process_create": len(events["process_create"]),
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"create_remote_thread": len(events["create_remote_thread"]),
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"process_access": len(events["process_access"]),
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},
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"total_detections": len(all_detections),
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"severity_summary": dict(severity_counts),
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"create_remote_thread_detections": thread_detections,
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"process_access_detections": access_detections,
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"injection_graph": injection_graph,
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"mitre_techniques": ["T1055", "T1055.001", "T1055.004", "T1055.012"],
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}
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def main():
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parser = argparse.ArgumentParser(description="Process Injection Detection Agent (T1055)")
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parser.add_argument("--log-file", required=True, help="Sysmon JSON event log file")
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parser.add_argument("--output", default="process_injection_report.json")
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args = parser.parse_args()
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events = parse_sysmon_events(args.log_file)
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thread_detections = detect_remote_thread_injection(events["create_remote_thread"])
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access_detections = detect_suspicious_process_access(events["process_access"])
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injection_graph = build_injection_graph(thread_detections, access_detections)
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report = generate_report(events, thread_detections, access_detections, injection_graph, args.log_file)
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with open(args.output, "w") as f:
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json.dump(report, f, indent=2, default=str)
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total = len(thread_detections) + len(access_detections)
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print(f"[+] Parsed {sum(len(v) for v in events.values())} Sysmon events")
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print(f"[+] CreateRemoteThread: {len(thread_detections)} | ProcessAccess: {len(access_detections)}")
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print(f"[+] Total injections detected: {total}")
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print(f"[+] Report saved to {args.output}")
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if __name__ == "__main__":
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main()
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